Merge pull request #61 from graphql-python/features/classtypes

Refactor ObjectTypes in ClassTypes. Fixed #30

bin/autolinter

@@ -1,5 +1,5 @@
 #!/bin/bash
 
-autoflake ./ -r --remove-unused-variables --remove-all-unused-imports --in-place
+autoflake ./examples/ ./graphene/ -r --remove-unused-variables --remove-all-unused-imports --in-place
-autopep8 ./ -r --in-place --experimental --aggressive --max-line-length 120
+autopep8 ./examples/ ./graphene/ -r --in-place --experimental --aggressive --max-line-length 120
-isort -rc .
+isort -rc ./examples/ ./graphene/

graphene/__init__.py

@@ -8,11 +8,15 @@ from graphene.core.schema import (
     Schema
 )
 
-from graphene.core.types import (
+from graphene.core.classtypes import (
     ObjectType,
     InputObjectType,
     Interface,
     Mutation,
+    Scalar
+)
+
+from graphene.core.types import (
     BaseType,
     LazyType,
     Argument,
@@ -59,6 +63,7 @@ __all__ = [
     'InputObjectType',
     'Interface',
     'Mutation',
+    'Scalar',
     'Field',
     'InputField',
     'StringField',

graphene/contrib/django/__init__.py

@@ -1,7 +1,6 @@
 from graphene.contrib.django.types import (
     DjangoConnection,
     DjangoObjectType,
-    DjangoInterface,
     DjangoNode
 )
 from graphene.contrib.django.fields import (
@@ -9,5 +8,5 @@ from graphene.contrib.django.fields import (
     DjangoModelField
 )
 
-__all__ = ['DjangoObjectType', 'DjangoInterface', 'DjangoNode',
+__all__ = ['DjangoObjectType', 'DjangoNode', 'DjangoConnection',
-           'DjangoConnection', 'DjangoConnectionField', 'DjangoModelField']
+           'DjangoConnectionField', 'DjangoModelField']

graphene/contrib/django/options.py

@@ -1,24 +1,15 @@
-import inspect
+from ...core.classtypes.objecttype import ObjectTypeOptions
-
-from django.db import models
-
-from ...core.options import Options
 from ...relay.types import Node
 from ...relay.utils import is_node
 
 VALID_ATTRS = ('model', 'only_fields', 'exclude_fields')
 
 
-def is_base(cls):
+class DjangoOptions(ObjectTypeOptions):
-    from graphene.contrib.django.types import DjangoObjectType
-    return DjangoObjectType in cls.__bases__
-
-
-class DjangoOptions(Options):
 
     def __init__(self, *args, **kwargs):
-        self.model = None
         super(DjangoOptions, self).__init__(*args, **kwargs)
+        self.model = None
         self.valid_attrs += VALID_ATTRS
         self.only_fields = None
         self.exclude_fields = []
@@ -28,11 +19,3 @@ class DjangoOptions(Options):
         if is_node(cls):
             self.exclude_fields = list(self.exclude_fields) + ['id']
             self.interfaces.append(Node)
-        if not is_node(cls) and not is_base(cls):
-            return
-        if not self.model:
-            raise Exception(
-                'Django ObjectType %s must have a model in the Meta class attr' %
-                cls)
-        elif not inspect.isclass(self.model) or not issubclass(self.model, models.Model):
-            raise Exception('Provided model in %s is not a Django model' % cls)

graphene/contrib/django/tests/test_types.py

@@ -1,9 +1,8 @@
-from graphql.core.type import GraphQLInterfaceType, GraphQLObjectType
+from graphql.core.type import GraphQLObjectType
 from mock import patch
-from pytest import raises
 
 from graphene import Schema
-from graphene.contrib.django.types import DjangoInterface, DjangoNode
+from graphene.contrib.django.types import DjangoNode, DjangoObjectType
 from graphene.core.fields import Field
 from graphene.core.types.scalars import Int
 from graphene.relay.fields import GlobalIDField
@@ -14,7 +13,8 @@ from .models import Article, Reporter
 schema = Schema()
 
 
-class Character(DjangoInterface):
+@schema.register
+class Character(DjangoObjectType):
     '''Character description'''
     class Meta:
         model = Reporter
@@ -31,7 +31,7 @@ class Human(DjangoNode):
 
 
 def test_django_interface():
-    assert DjangoNode._meta.is_interface is True
+    assert DjangoNode._meta.interface is True
 
 
 @patch('graphene.contrib.django.tests.models.Article.objects.get', return_value=Article(id=1))
@@ -41,17 +41,6 @@ def test_django_get_node(get):
     assert human.id == 1
 
 
-def test_pseudo_interface_registered():
-    object_type = schema.T(Character)
-    assert Character._meta.is_interface is True
-    assert isinstance(object_type, GraphQLInterfaceType)
-    assert Character._meta.model == Reporter
-    assert_equal_lists(
-        object_type.get_fields().keys(),
-        ['articles', 'firstName', 'lastName', 'email', 'pets', 'id']
-    )
-
-
 def test_djangonode_idfield():
     idfield = DjangoNode._meta.fields_map['id']
     assert isinstance(idfield, GlobalIDField)
@@ -68,32 +57,21 @@ def test_node_replacedfield():
     assert schema.T(idfield).type == schema.T(Int())
 
 
-def test_interface_resolve_type():
+def test_objecttype_init_none():
-    resolve_type = Character._resolve_type(schema, Human())
-    assert isinstance(resolve_type, GraphQLObjectType)
-
-
-def test_interface_objecttype_init_none():
     h = Human()
     assert h._root is None
 
 
-def test_interface_objecttype_init_good():
+def test_objecttype_init_good():
     instance = Article()
     h = Human(instance)
     assert h._root == instance
 
 
-def test_interface_objecttype_init_unexpected():
-    with raises(AssertionError) as excinfo:
-        Human(object())
-    assert str(excinfo.value) == "Human received a non-compatible instance (object) when expecting Article"
-
-
 def test_object_type():
     object_type = schema.T(Human)
     Human._meta.fields_map
-    assert Human._meta.is_interface is False
+    assert Human._meta.interface is False
     assert isinstance(object_type, GraphQLObjectType)
     assert_equal_lists(
         object_type.get_fields().keys(),
@@ -103,5 +81,5 @@ def test_object_type():
 
 
 def test_node_notinterface():
-    assert Human._meta.is_interface is False
+    assert Human._meta.interface is False
     assert DjangoNode in Human._meta.interfaces

graphene/contrib/django/types.py

@@ -1,22 +1,19 @@
-import six
+import inspect
 
-from ...core.types import BaseObjectType, ObjectTypeMeta
+import six
-from ...relay.fields import GlobalIDField
+from django.db import models
-from ...relay.types import BaseNode, Connection
+
+from ...core.classtypes.objecttype import ObjectType, ObjectTypeMeta
+from ...relay.types import Connection, Node, NodeMeta
 from .converter import convert_django_field
 from .options import DjangoOptions
 from .utils import get_reverse_fields, maybe_queryset
 
 
 class DjangoObjectTypeMeta(ObjectTypeMeta):
-    options_cls = DjangoOptions
+    options_class = DjangoOptions
 
-    def is_interface(cls, parents):
+    def construct_fields(cls):
-        return DjangoInterface in parents
-
-    def add_extra_fields(cls):
-        if not cls._meta.model:
-            return
         only_fields = cls._meta.only_fields
         reverse_fields = get_reverse_fields(cls._meta.model)
         all_fields = sorted(list(cls._meta.model._meta.fields) +
@@ -35,8 +32,24 @@ class DjangoObjectTypeMeta(ObjectTypeMeta):
             converted_field = convert_django_field(field)
             cls.add_to_class(field.name, converted_field)
 
+    def construct(cls, *args, **kwargs):
+        cls = super(DjangoObjectTypeMeta, cls).construct(*args, **kwargs)
+        if not cls._meta.abstract:
+            if not cls._meta.model:
+                raise Exception(
+                    'Django ObjectType %s must have a model in the Meta class attr' %
+                    cls)
+            elif not inspect.isclass(cls._meta.model) or not issubclass(cls._meta.model, models.Model):
+                raise Exception('Provided model in %s is not a Django model' % cls)
 
-class InstanceObjectType(BaseObjectType):
+            cls.construct_fields()
+        return cls
+
+
+class InstanceObjectType(ObjectType):
+
+    class Meta:
+        abstract = True
 
     def __init__(self, _root=None):
         if _root:
@@ -63,12 +76,9 @@ class InstanceObjectType(BaseObjectType):
 
 class DjangoObjectType(six.with_metaclass(
         DjangoObjectTypeMeta, InstanceObjectType)):
-    pass
 
-
+    class Meta:
-class DjangoInterface(six.with_metaclass(
+        abstract = True
-        DjangoObjectTypeMeta, InstanceObjectType)):
-    pass
 
 
 class DjangoConnection(Connection):
@@ -79,8 +89,21 @@ class DjangoConnection(Connection):
         return super(DjangoConnection, cls).from_list(iterable, *args, **kwargs)
 
 
-class DjangoNode(BaseNode, DjangoInterface):
+class DjangoNodeMeta(DjangoObjectTypeMeta, NodeMeta):
-    id = GlobalIDField()
+    pass
+
+
+class NodeInstance(Node, InstanceObjectType):
+
+    class Meta:
+        abstract = True
+
+
+class DjangoNode(six.with_metaclass(
+        DjangoNodeMeta, NodeInstance)):
+
+    class Meta:
+        abstract = True
 
     @classmethod
     def get_node(cls, id, info=None):

graphene/core/classtypes/__init__.py

@@ -0,0 +1,16 @@
+from .inputobjecttype import InputObjectType
+from .interface import Interface
+from .mutation import Mutation
+from .objecttype import ObjectType
+from .options import Options
+from .scalar import Scalar
+from .uniontype import UnionType
+
+__all__ = [
+    'InputObjectType',
+    'Interface',
+    'Mutation',
+    'ObjectType',
+    'Options',
+    'Scalar',
+    'UnionType']

graphene/core/classtypes/base.py

@@ -0,0 +1,133 @@
+import copy
+import inspect
+from collections import OrderedDict
+
+import six
+
+from ..exceptions import SkipField
+from .options import Options
+
+
+class ClassTypeMeta(type):
+    options_class = Options
+
+    def __new__(mcs, name, bases, attrs):
+        super_new = super(ClassTypeMeta, mcs).__new__
+
+        module = attrs.pop('__module__', None)
+        doc = attrs.pop('__doc__', None)
+        new_class = super_new(mcs, name, bases, {
+            '__module__': module,
+            '__doc__': doc
+        })
+        attr_meta = attrs.pop('Meta', None)
+        if not attr_meta:
+            meta = getattr(new_class, 'Meta', None)
+        else:
+            meta = attr_meta
+
+        new_class.add_to_class('_meta', new_class.get_options(meta))
+
+        return mcs.construct(new_class, bases, attrs)
+
+    def get_options(cls, meta):
+        return cls.options_class(meta)
+
+    def add_to_class(cls, name, value):
+        # We should call the contribute_to_class method only if it's bound
+        if not inspect.isclass(value) and hasattr(
+                value, 'contribute_to_class'):
+            value.contribute_to_class(cls, name)
+        else:
+            setattr(cls, name, value)
+
+    def construct(cls, bases, attrs):
+        # Add all attributes to the class.
+        for obj_name, obj in attrs.items():
+            cls.add_to_class(obj_name, obj)
+
+        if not cls._meta.abstract:
+            from ..types import List, NonNull
+            setattr(cls, 'NonNull', NonNull(cls))
+            setattr(cls, 'List', List(cls))
+
+        return cls
+
+
+class ClassType(six.with_metaclass(ClassTypeMeta)):
+
+    class Meta:
+        abstract = True
+
+    @classmethod
+    def internal_type(cls, schema):
+        raise NotImplementedError("Function internal_type not implemented in type {}".format(cls))
+
+
+class FieldsOptions(Options):
+
+    def __init__(self, *args, **kwargs):
+        super(FieldsOptions, self).__init__(*args, **kwargs)
+        self.local_fields = []
+
+    def add_field(self, field):
+        self.local_fields.append(field)
+
+    @property
+    def fields(self):
+        return sorted(self.local_fields)
+
+    @property
+    def fields_map(self):
+        return OrderedDict([(f.attname, f) for f in self.fields])
+
+
+class FieldsClassTypeMeta(ClassTypeMeta):
+    options_class = FieldsOptions
+
+    def extend_fields(cls, bases):
+        new_fields = cls._meta.local_fields
+        field_names = {f.name: f for f in new_fields}
+
+        for base in bases:
+            if not isinstance(base, FieldsClassTypeMeta):
+                continue
+
+            parent_fields = base._meta.local_fields
+            for field in parent_fields:
+                if field.name in field_names and field.type.__class__ != field_names[
+                        field.name].type.__class__:
+                    raise Exception(
+                        'Local field %r in class %r (%r) clashes '
+                        'with field with similar name from '
+                        'Interface %s (%r)' % (
+                            field.name,
+                            cls.__name__,
+                            field.__class__,
+                            base.__name__,
+                            field_names[field.name].__class__)
+                    )
+                new_field = copy.copy(field)
+                cls.add_to_class(field.attname, new_field)
+
+    def construct(cls, bases, attrs):
+        cls = super(FieldsClassTypeMeta, cls).construct(bases, attrs)
+        cls.extend_fields(bases)
+        return cls
+
+
+class FieldsClassType(six.with_metaclass(FieldsClassTypeMeta, ClassType)):
+
+    class Meta:
+        abstract = True
+
+    @classmethod
+    def fields_internal_types(cls, schema):
+        fields = []
+        for field in cls._meta.fields:
+            try:
+                fields.append((field.name, schema.T(field)))
+            except SkipField:
+                continue
+
+        return OrderedDict(fields)

graphene/core/classtypes/inputobjecttype.py

@@ -0,0 +1,25 @@
+from functools import partial
+
+from graphql.core.type import GraphQLInputObjectType
+
+from .base import FieldsClassType
+
+
+class InputObjectType(FieldsClassType):
+
+    class Meta:
+        abstract = True
+
+    def __init__(self, *args, **kwargs):
+        raise Exception("An InputObjectType cannot be initialized")
+
+    @classmethod
+    def internal_type(cls, schema):
+        if cls._meta.abstract:
+            raise Exception("Abstract InputObjectTypes don't have a specific type.")
+
+        return GraphQLInputObjectType(
+            cls._meta.type_name,
+            description=cls._meta.description,
+            fields=partial(cls.fields_internal_types, schema),
+        )

graphene/core/classtypes/interface.py

@@ -0,0 +1,53 @@
+from functools import partial
+
+import six
+from graphql.core.type import GraphQLInterfaceType
+
+from .base import FieldsClassTypeMeta
+from .objecttype import ObjectType, ObjectTypeMeta
+
+
+class InterfaceMeta(ObjectTypeMeta):
+
+    def construct(cls, bases, attrs):
+        if cls._meta.abstract or Interface in bases:
+            # Return Interface type
+            cls = FieldsClassTypeMeta.construct(cls, bases, attrs)
+            setattr(cls._meta, 'interface', True)
+            return cls
+        else:
+            # Return ObjectType class with all the inherited interfaces
+            cls = super(InterfaceMeta, cls).construct(bases, attrs)
+            for interface in bases:
+                is_interface = issubclass(interface, Interface) and getattr(interface._meta, 'interface', False)
+                if not is_interface:
+                    continue
+                cls._meta.interfaces.append(interface)
+            return cls
+
+
+class Interface(six.with_metaclass(InterfaceMeta, ObjectType)):
+
+    class Meta:
+        abstract = True
+
+    def __init__(self, *args, **kwargs):
+        if self._meta.interface:
+            raise Exception("An interface cannot be initialized")
+        return super(Interface, self).__init__(*args, **kwargs)
+
+    @classmethod
+    def _resolve_type(cls, schema, instance, *args):
+        return schema.T(instance.__class__)
+
+    @classmethod
+    def internal_type(cls, schema):
+        if not cls._meta.interface:
+            return super(Interface, cls).internal_type(schema)
+
+        return GraphQLInterfaceType(
+            cls._meta.type_name,
+            description=cls._meta.description,
+            resolve_type=partial(cls._resolve_type, schema),
+            fields=partial(cls.fields_internal_types, schema)
+        )

graphene/core/classtypes/mutation.py

@@ -0,0 +1,32 @@
+import six
+
+from .objecttype import ObjectType, ObjectTypeMeta
+
+
+class MutationMeta(ObjectTypeMeta):
+
+    def construct(cls, bases, attrs):
+        input_class = attrs.pop('Input', None)
+        if input_class:
+            items = dict(vars(input_class))
+            items.pop('__dict__', None)
+            items.pop('__doc__', None)
+            items.pop('__module__', None)
+            items.pop('__weakref__', None)
+            cls.add_to_class('arguments', cls.construct_arguments(items))
+        cls = super(MutationMeta, cls).construct(bases, attrs)
+        return cls
+
+    def construct_arguments(cls, items):
+        from ..types.argument import ArgumentsGroup
+        return ArgumentsGroup(**items)
+
+
+class Mutation(six.with_metaclass(MutationMeta, ObjectType)):
+
+    class Meta:
+        abstract = True
+
+    @classmethod
+    def get_arguments(cls):
+        return cls.arguments

graphene/core/classtypes/objecttype.py

@@ -0,0 +1,103 @@
+from functools import partial
+
+import six
+from graphql.core.type import GraphQLObjectType
+
+from graphene import signals
+
+from .base import FieldsClassType, FieldsClassTypeMeta, FieldsOptions
+from .uniontype import UnionType
+
+
+def is_objecttype(cls):
+    if not issubclass(cls, ObjectType):
+        return False
+    return not cls._meta.interface
+
+
+class ObjectTypeOptions(FieldsOptions):
+
+    def __init__(self, *args, **kwargs):
+        super(ObjectTypeOptions, self).__init__(*args, **kwargs)
+        self.interface = False
+        self.interfaces = []
+
+
+class ObjectTypeMeta(FieldsClassTypeMeta):
+
+    def construct(cls, bases, attrs):
+        cls = super(ObjectTypeMeta, cls).construct(bases, attrs)
+        if not cls._meta.abstract:
+            union_types = list(filter(is_objecttype, bases))
+            if len(union_types) > 1:
+                meta_attrs = dict(cls._meta.original_attrs, types=union_types)
+                Meta = type('Meta', (object, ), meta_attrs)
+                attrs['Meta'] = Meta
+                attrs['__module__'] = cls.__module__
+                attrs['__doc__'] = cls.__doc__
+                return type(cls.__name__, (UnionType, ), attrs)
+        return cls
+
+    options_class = ObjectTypeOptions
+
+
+class ObjectType(six.with_metaclass(ObjectTypeMeta, FieldsClassType)):
+
+    class Meta:
+        abstract = True
+
+    def __init__(self, *args, **kwargs):
+        signals.pre_init.send(self.__class__, args=args, kwargs=kwargs)
+        self._root = kwargs.pop('_root', None)
+        args_len = len(args)
+        fields = self._meta.fields
+        if args_len > len(fields):
+            # Daft, but matches old exception sans the err msg.
+            raise IndexError("Number of args exceeds number of fields")
+        fields_iter = iter(fields)
+
+        if not kwargs:
+            for val, field in zip(args, fields_iter):
+                setattr(self, field.attname, val)
+        else:
+            for val, field in zip(args, fields_iter):
+                setattr(self, field.attname, val)
+                kwargs.pop(field.attname, None)
+
+        for field in fields_iter:
+            try:
+                val = kwargs.pop(field.attname)
+                setattr(self, field.attname, val)
+            except KeyError:
+                pass
+
+        if kwargs:
+            for prop in list(kwargs):
+                try:
+                    if isinstance(getattr(self.__class__, prop), property):
+                        setattr(self, prop, kwargs.pop(prop))
+                except AttributeError:
+                    pass
+            if kwargs:
+                raise TypeError(
+                    "'%s' is an invalid keyword argument for this function" %
+                    list(kwargs)[0])
+
+        signals.post_init.send(self.__class__, instance=self)
+
+    @classmethod
+    def internal_type(cls, schema):
+        if cls._meta.abstract:
+            raise Exception("Abstract ObjectTypes don't have a specific type.")
+
+        return GraphQLObjectType(
+            cls._meta.type_name,
+            description=cls._meta.description,
+            interfaces=list(map(schema.T, cls._meta.interfaces)),
+            fields=partial(cls.fields_internal_types, schema),
+            is_type_of=getattr(cls, 'is_type_of', None)
+        )
+
+    @classmethod
+    def wrap(cls, instance, args, info):
+        return cls(_root=instance)

graphene/core/classtypes/options.py

@@ -1,24 +1,11 @@
-from collections import OrderedDict
-
-from ..utils import cached_property
-
-DEFAULT_NAMES = ('description', 'name', 'is_interface', 'is_mutation',
-                 'type_name', 'interfaces', 'abstract')
-
-
 class Options(object):
 
-    def __init__(self, meta=None):
+    def __init__(self, meta=None, **defaults):
         self.meta = meta
-        self.local_fields = []
-        self.is_interface = False
-        self.is_mutation = False
-        self.is_union = False
         self.abstract = False
-        self.interfaces = []
+        for name, value in defaults.items():
-        self.parents = []
+            setattr(self, name, value)
-        self.types = []
+        self.valid_attrs = list(defaults.keys()) + ['type_name', 'description', 'abstract']
-        self.valid_attrs = DEFAULT_NAMES
 
     def contribute_to_class(self, cls, name):
         cls._meta = self
@@ -59,14 +46,3 @@ class Options(object):
                         meta_attrs.keys()))
 
         del self.meta
-
-    def add_field(self, field):
-        self.local_fields.append(field)
-
-    @cached_property
-    def fields(self):
-        return sorted(self.local_fields)
-
-    @cached_property
-    def fields_map(self):
-        return OrderedDict([(f.attname, f) for f in self.fields])

graphene/core/classtypes/scalar.py

@@ -0,0 +1,21 @@
+from graphql.core.type import GraphQLScalarType
+
+from ..types.base import MountedType
+from .base import ClassType
+
+
+class Scalar(ClassType, MountedType):
+
+    @classmethod
+    def internal_type(cls, schema):
+        serialize = getattr(cls, 'serialize')
+        parse_literal = getattr(cls, 'parse_literal')
+        parse_value = getattr(cls, 'parse_value')
+
+        return GraphQLScalarType(
+            name=cls._meta.type_name,
+            description=cls._meta.description,
+            serialize=serialize,
+            parse_value=parse_value,
+            parse_literal=parse_literal
+        )

graphene/core/classtypes/test_options.py

@@ -1,11 +1,9 @@
 from py.test import raises
 
-from graphene.core.fields import Field
+from graphene.core.classtypes import Options
-from graphene.core.options import Options
 
 
 class Meta:
-    is_interface = True
     type_name = 'Character'
 
 
@@ -13,19 +11,6 @@ class InvalidMeta:
     other_value = True
 
 
-def test_field_added_in_meta():
-    opt = Options(Meta)
-
-    class ObjectType(object):
-        pass
-
-    opt.contribute_to_class(ObjectType, '_meta')
-    f = Field(None)
-    f.attname = 'string_field'
-    opt.add_field(f)
-    assert f in opt.fields
-
-
 def test_options_contribute():
     opt = Options(Meta)
 

graphene/core/classtypes/tests/test_base.py

@@ -0,0 +1,67 @@
+from ...schema import Schema
+from ...types import Field, List, NonNull, String
+from ..base import ClassType, FieldsClassType
+
+
+def test_classtype_basic():
+    class Character(ClassType):
+        '''Character description'''
+    assert Character._meta.type_name == 'Character'
+    assert Character._meta.description == 'Character description'
+
+
+def test_classtype_advanced():
+    class Character(ClassType):
+
+        class Meta:
+            type_name = 'OtherCharacter'
+            description = 'OtherCharacter description'
+    assert Character._meta.type_name == 'OtherCharacter'
+    assert Character._meta.description == 'OtherCharacter description'
+
+
+def test_classtype_definition_list():
+    class Character(ClassType):
+        '''Character description'''
+    assert isinstance(Character.List, List)
+    assert Character.List.of_type == Character
+
+
+def test_classtype_definition_nonnull():
+    class Character(ClassType):
+        '''Character description'''
+    assert isinstance(Character.NonNull, NonNull)
+    assert Character.NonNull.of_type == Character
+
+
+def test_fieldsclasstype():
+    f = Field(String())
+
+    class Character(FieldsClassType):
+        field_name = f
+
+    assert Character._meta.fields == [f]
+
+
+def test_fieldsclasstype_fieldtype():
+    f = Field(String())
+
+    class Character(FieldsClassType):
+        field_name = f
+
+    schema = Schema(query=Character)
+    assert Character.fields_internal_types(schema)['fieldName'] == schema.T(f)
+    assert Character._meta.fields_map['field_name'] == f
+
+
+def test_fieldsclasstype_inheritfields():
+    name_field = Field(String())
+    last_name_field = Field(String())
+
+    class Fields1(FieldsClassType):
+        name = name_field
+
+    class Fields2(Fields1):
+        last_name = last_name_field
+
+    assert list(Fields2._meta.fields_map.keys()) == ['name', 'last_name']

graphene/core/classtypes/tests/test_inputobjecttype.py

@@ -0,0 +1,21 @@
+
+from graphql.core.type import GraphQLInputObjectType
+
+from graphene.core.schema import Schema
+from graphene.core.types import String
+
+from ..inputobjecttype import InputObjectType
+
+
+def test_inputobjecttype():
+    class InputCharacter(InputObjectType):
+        '''InputCharacter description'''
+        name = String()
+
+    schema = Schema()
+
+    object_type = schema.T(InputCharacter)
+    assert isinstance(object_type, GraphQLInputObjectType)
+    assert InputCharacter._meta.type_name == 'InputCharacter'
+    assert object_type.description == 'InputCharacter description'
+    assert list(object_type.get_fields().keys()) == ['name']

graphene/core/classtypes/tests/test_interface.py

@@ -0,0 +1,86 @@
+from graphql.core.type import GraphQLInterfaceType, GraphQLObjectType
+from py.test import raises
+
+from graphene.core.schema import Schema
+from graphene.core.types import String
+
+from ..interface import Interface
+from ..objecttype import ObjectType
+
+
+def test_interface():
+    class Character(Interface):
+        '''Character description'''
+        name = String()
+
+    schema = Schema()
+
+    object_type = schema.T(Character)
+    assert issubclass(Character, Interface)
+    assert isinstance(object_type, GraphQLInterfaceType)
+    assert Character._meta.interface
+    assert Character._meta.type_name == 'Character'
+    assert object_type.description == 'Character description'
+    assert list(object_type.get_fields().keys()) == ['name']
+
+
+def test_interface_cannot_initialize():
+    class Character(Interface):
+        pass
+
+    with raises(Exception) as excinfo:
+        Character()
+    assert 'An interface cannot be initialized' == str(excinfo.value)
+
+
+def test_interface_inheritance_abstract():
+    class Character(Interface):
+        pass
+
+    class ShouldBeInterface(Character):
+
+        class Meta:
+            abstract = True
+
+    class ShouldBeObjectType(ShouldBeInterface):
+        pass
+
+    assert ShouldBeInterface._meta.interface
+    assert not ShouldBeObjectType._meta.interface
+    assert issubclass(ShouldBeObjectType, ObjectType)
+
+
+def test_interface_inheritance():
+    class Character(Interface):
+        pass
+
+    class GeneralInterface(Interface):
+        pass
+
+    class ShouldBeObjectType(GeneralInterface, Character):
+        pass
+
+    schema = Schema()
+
+    assert Character._meta.interface
+    assert not ShouldBeObjectType._meta.interface
+    assert issubclass(ShouldBeObjectType, ObjectType)
+    assert Character in ShouldBeObjectType._meta.interfaces
+    assert GeneralInterface in ShouldBeObjectType._meta.interfaces
+    assert isinstance(schema.T(Character), GraphQLInterfaceType)
+    assert isinstance(schema.T(ShouldBeObjectType), GraphQLObjectType)
+
+
+def test_interface_inheritance_non_objects():
+    class CommonClass(object):
+        common_attr = True
+
+    class Character(CommonClass, Interface):
+        pass
+
+    class ShouldBeObjectType(Character):
+        pass
+
+    assert Character._meta.interface
+    assert Character.common_attr
+    assert ShouldBeObjectType.common_attr

graphene/core/classtypes/tests/test_mutation.py

@@ -0,0 +1,27 @@
+
+from graphql.core.type import GraphQLObjectType
+
+from graphene.core.schema import Schema
+from graphene.core.types import String
+
+from ...types.argument import ArgumentsGroup
+from ..mutation import Mutation
+
+
+def test_mutation():
+    class MyMutation(Mutation):
+        '''MyMutation description'''
+        class Input:
+            arg_name = String()
+        name = String()
+
+    schema = Schema()
+
+    object_type = schema.T(MyMutation)
+    assert MyMutation._meta.type_name == 'MyMutation'
+    assert isinstance(object_type, GraphQLObjectType)
+    assert object_type.description == 'MyMutation description'
+    assert list(object_type.get_fields().keys()) == ['name']
+    assert MyMutation._meta.fields_map['name'].object_type == MyMutation
+    assert isinstance(MyMutation.arguments, ArgumentsGroup)
+    assert 'argName' in MyMutation.arguments

graphene/core/classtypes/tests/test_objecttype.py

@@ -0,0 +1,89 @@
+from graphql.core.type import GraphQLObjectType
+from py.test import raises
+
+from graphene.core.schema import Schema
+from graphene.core.types import String
+
+from ..objecttype import ObjectType
+from ..uniontype import UnionType
+
+
+def test_object_type():
+    class Human(ObjectType):
+        '''Human description'''
+        name = String()
+        friends = String()
+
+    schema = Schema()
+
+    object_type = schema.T(Human)
+    assert Human._meta.type_name == 'Human'
+    assert isinstance(object_type, GraphQLObjectType)
+    assert object_type.description == 'Human description'
+    assert list(object_type.get_fields().keys()) == ['name', 'friends']
+    assert Human._meta.fields_map['name'].object_type == Human
+
+
+def test_object_type_container():
+    class Human(ObjectType):
+        name = String()
+        friends = String()
+
+    h = Human(name='My name')
+    assert h.name == 'My name'
+
+
+def test_object_type_set_properties():
+    class Human(ObjectType):
+        name = String()
+        friends = String()
+
+        @property
+        def readonly_prop(self):
+            return 'readonly'
+
+        @property
+        def write_prop(self):
+            return self._write_prop
+
+        @write_prop.setter
+        def write_prop(self, value):
+            self._write_prop = value
+
+    h = Human(readonly_prop='custom', write_prop='custom')
+    assert h.readonly_prop == 'readonly'
+    assert h.write_prop == 'custom'
+
+
+def test_object_type_container_invalid_kwarg():
+    class Human(ObjectType):
+        name = String()
+
+    with raises(TypeError):
+        Human(invalid='My name')
+
+
+def test_object_type_container_too_many_args():
+    class Human(ObjectType):
+        name = String()
+
+    with raises(IndexError):
+        Human('Peter', 'No friends :(', None)
+
+
+def test_object_type_union():
+    class Human(ObjectType):
+        name = String()
+
+    class Pet(ObjectType):
+        name = String()
+
+    class Thing(Human, Pet):
+        '''Thing union description'''
+        my_attr = True
+
+    assert issubclass(Thing, UnionType)
+    assert Thing._meta.types == [Human, Pet]
+    assert Thing._meta.type_name == 'Thing'
+    assert Thing._meta.description == 'Thing union description'
+    assert Thing.my_attr

graphene/core/classtypes/tests/test_scalar.py

@@ -0,0 +1,32 @@
+from graphql.core.type import GraphQLScalarType
+
+from ...schema import Schema
+from ..scalar import Scalar
+
+
+def test_custom_scalar():
+    import datetime
+    from graphql.core.language import ast
+
+    class DateTimeScalar(Scalar):
+        '''DateTimeScalar Documentation'''
+        @staticmethod
+        def serialize(dt):
+            return dt.isoformat()
+
+        @staticmethod
+        def parse_literal(node):
+            if isinstance(node, ast.StringValue):
+                return datetime.datetime.strptime(
+                    node.value, "%Y-%m-%dT%H:%M:%S.%f")
+
+        @staticmethod
+        def parse_value(value):
+            return datetime.datetime.strptime(value, "%Y-%m-%dT%H:%M:%S.%f")
+
+    schema = Schema()
+
+    scalar_type = schema.T(DateTimeScalar)
+    assert isinstance(scalar_type, GraphQLScalarType)
+    assert scalar_type.name == 'DateTimeScalar'
+    assert scalar_type.description == 'DateTimeScalar Documentation'

graphene/core/classtypes/tests/test_uniontype.py

@@ -0,0 +1,28 @@
+from graphql.core.type import GraphQLUnionType
+
+from graphene.core.schema import Schema
+from graphene.core.types import String
+
+from ..objecttype import ObjectType
+from ..uniontype import UnionType
+
+
+def test_uniontype():
+    class Human(ObjectType):
+        name = String()
+
+    class Pet(ObjectType):
+        name = String()
+
+    class Thing(UnionType):
+        '''Thing union description'''
+        class Meta:
+            types = [Human, Pet]
+
+    schema = Schema()
+
+    object_type = schema.T(Thing)
+    assert isinstance(object_type, GraphQLUnionType)
+    assert Thing._meta.type_name == 'Thing'
+    assert object_type.description == 'Thing union description'
+    assert object_type.get_possible_types() == [schema.T(Human), schema.T(Pet)]

graphene/core/classtypes/uniontype.py

@@ -0,0 +1,40 @@
+import six
+from graphql.core.type import GraphQLUnionType
+
+from .base import FieldsClassType, FieldsClassTypeMeta, FieldsOptions
+
+
+class UnionTypeOptions(FieldsOptions):
+
+    def __init__(self, *args, **kwargs):
+        super(UnionTypeOptions, self).__init__(*args, **kwargs)
+        self.types = []
+
+
+class UnionTypeMeta(FieldsClassTypeMeta):
+    options_class = UnionTypeOptions
+
+    def get_options(cls, meta):
+        return cls.options_class(meta, types=[])
+
+
+class UnionType(six.with_metaclass(UnionTypeMeta, FieldsClassType)):
+
+    class Meta:
+        abstract = True
+
+    @classmethod
+    def _resolve_type(cls, schema, instance, *args):
+        return schema.T(instance.__class__)
+
+    @classmethod
+    def internal_type(cls, schema):
+        if cls._meta.abstract:
+            raise Exception("Abstract ObjectTypes don't have a specific type.")
+
+        return GraphQLUnionType(
+            cls._meta.type_name,
+            types=list(map(schema.T, cls._meta.types)),
+            resolve_type=cls._resolve_type,
+            description=cls._meta.description,
+        )

graphene/core/schema.py

@@ -10,8 +10,8 @@ from graphql.core.utils.schema_printer import print_schema
 
 from graphene import signals
 
+from .classtypes.base import ClassType
 from .types.base import BaseType
-from .types.objecttype import BaseObjectType
 
 
 class GraphQLSchema(_GraphQLSchema):
@@ -42,13 +42,13 @@ class Schema(object):
         if not object_type:
             return
         if inspect.isclass(object_type) and issubclass(
-                object_type, BaseType) or isinstance(
+                object_type, (BaseType, ClassType)) or isinstance(
                 object_type, BaseType):
             if object_type not in self._types:
                 internal_type = object_type.internal_type(self)
                 self._types[object_type] = internal_type
                 is_objecttype = inspect.isclass(
-                    object_type) and issubclass(object_type, BaseObjectType)
+                    object_type) and issubclass(object_type, ClassType)
                 if is_objecttype:
                     self.register(object_type)
             return self._types[object_type]
@@ -90,7 +90,7 @@ class Schema(object):
         if name:
             objecttype = self._types_names.get(name, None)
             if objecttype and inspect.isclass(
-                    objecttype) and issubclass(objecttype, BaseObjectType):
+                    objecttype) and issubclass(objecttype, ClassType):
                 return objecttype
 
     def __str__(self):

graphene/core/types/__init__.py

@@ -1,7 +1,9 @@
 from .base import BaseType, LazyType, OrderedType
 from .argument import Argument, ArgumentsGroup, to_arguments
 from .definitions import List, NonNull
-from .objecttype import ObjectTypeMeta, BaseObjectType, Interface, ObjectType, Mutation, InputObjectType
+# Compatibility import
+from .objecttype import Interface, ObjectType, Mutation, InputObjectType
+
 from .scalars import String, ID, Boolean, Int, Float, Scalar
 from .field import Field, InputField
 
@@ -17,8 +19,6 @@ __all__ = [
     'Field',
     'InputField',
     'Interface',
-    'BaseObjectType',
-    'ObjectTypeMeta',
     'ObjectType',
     'Mutation',
     'InputObjectType',

graphene/core/types/base.py

@@ -104,11 +104,12 @@ class ArgumentType(MirroredType):
 class FieldType(MirroredType):
 
     def contribute_to_class(self, cls, name):
-        from ..types import BaseObjectType, InputObjectType
+        from ..classtypes.base import FieldsClassType
-        if issubclass(cls, InputObjectType):
+        from ..classtypes.inputobjecttype import InputObjectType
+        if issubclass(cls, (InputObjectType)):
             inputfield = self.as_inputfield()
             return inputfield.contribute_to_class(cls, name)
-        elif issubclass(cls, BaseObjectType):
+        elif issubclass(cls, (FieldsClassType)):
             field = self.as_field()
             return field.contribute_to_class(cls, name)
 

graphene/core/types/field.py

@@ -5,7 +5,9 @@ import six
 from graphql.core.type import GraphQLField, GraphQLInputObjectField
 
 from ...utils import to_camel_case
-from ..types import BaseObjectType, InputObjectType
+from ..classtypes.base import FieldsClassType
+from ..classtypes.inputobjecttype import InputObjectType
+from ..classtypes.mutation import Mutation
 from .argument import ArgumentsGroup, snake_case_args
 from .base import LazyType, MountType, OrderedType
 from .definitions import NonNull
@@ -32,7 +34,7 @@ class Field(OrderedType):
 
     def contribute_to_class(self, cls, attname):
         assert issubclass(
-            cls, BaseObjectType), 'Field {} cannot be mounted in {}'.format(
+            cls, (FieldsClassType)), 'Field {} cannot be mounted in {}'.format(
             self, cls)
         if not self.name:
             self.name = to_camel_case(attname)
@@ -69,7 +71,7 @@ class Field(OrderedType):
             description = resolver.__doc__
         type = schema.T(self.get_type(schema))
         type_objecttype = schema.objecttype(type)
-        if type_objecttype and type_objecttype._meta.is_mutation:
+        if type_objecttype and issubclass(type_objecttype, Mutation):
             assert len(arguments) == 0
             arguments = type_objecttype.get_arguments()
             resolver = getattr(type_objecttype, 'mutate')
@@ -126,7 +128,7 @@ class InputField(OrderedType):
 
     def contribute_to_class(self, cls, attname):
         assert issubclass(
-            cls, InputObjectType), 'InputField {} cannot be mounted in {}'.format(
+            cls, (InputObjectType)), 'InputField {} cannot be mounted in {}'.format(
             self, cls)
         if not self.name:
             self.name = to_camel_case(attname)

graphene/core/types/objecttype.py

@@ -1,282 +1,3 @@
-import copy
+from ..classtypes import InputObjectType, Interface, Mutation, ObjectType
-import inspect
-from collections import OrderedDict
-from functools import partial
 
-import six
+__all__ = ['ObjectType', 'Interface', 'Mutation', 'InputObjectType']
-from graphql.core.type import (GraphQLInputObjectType, GraphQLInterfaceType,
-                               GraphQLObjectType, GraphQLUnionType)
-
-from graphene import signals
-
-from ..exceptions import SkipField
-from ..options import Options
-from .argument import ArgumentsGroup
-from .base import BaseType
-from .definitions import List, NonNull
-
-
-def is_objecttype(cls):
-    if not issubclass(cls, BaseObjectType):
-        return False
-    _meta = getattr(cls, '_meta', None)
-    return not(_meta and (_meta.abstract or _meta.is_interface))
-
-
-class ObjectTypeMeta(type):
-    options_cls = Options
-
-    def is_interface(cls, parents):
-        return Interface in parents
-
-    def is_mutation(cls, parents):
-        return issubclass(cls, Mutation)
-
-    def __new__(cls, name, bases, attrs):
-        super_new = super(ObjectTypeMeta, cls).__new__
-        parents = [b for b in bases if isinstance(b, cls)]
-        if not parents:
-            # If this isn't a subclass of Model, don't do anything special.
-            return super_new(cls, name, bases, attrs)
-
-        module = attrs.pop('__module__', None)
-        doc = attrs.pop('__doc__', None)
-        new_class = super_new(cls, name, bases, {
-            '__module__': module,
-            '__doc__': doc
-        })
-        attr_meta = attrs.pop('Meta', None)
-        abstract = getattr(attr_meta, 'abstract', False)
-        if not attr_meta:
-            meta = getattr(new_class, 'Meta', None)
-        else:
-            meta = attr_meta
-
-        base_meta = getattr(new_class, '_meta', None)
-
-        new_class.add_to_class('_meta', new_class.options_cls(meta))
-
-        new_class._meta.is_interface = new_class.is_interface(parents)
-        new_class._meta.is_mutation = new_class.is_mutation(parents) or (base_meta and base_meta.is_mutation)
-        union_types = list(filter(is_objecttype, parents))
-
-        new_class._meta.is_union = len(union_types) > 1
-        new_class._meta.types = union_types
-
-        assert not (
-            new_class._meta.is_interface and new_class._meta.is_mutation)
-
-        assert not (
-            new_class._meta.is_interface and new_class._meta.is_union)
-
-        # Add all attributes to the class.
-        for obj_name, obj in attrs.items():
-            new_class.add_to_class(obj_name, obj)
-
-        if abstract:
-            new_class._prepare()
-            return new_class
-
-        if new_class._meta.is_mutation:
-            assert hasattr(
-                new_class, 'mutate'), "All mutations must implement mutate method"
-
-        new_class.add_extra_fields()
-
-        new_fields = new_class._meta.local_fields
-        assert not(new_class._meta.is_union and new_fields), 'An union cannot have extra fields'
-
-        field_names = {f.name: f for f in new_fields}
-
-        for base in parents:
-            if not hasattr(base, '_meta'):
-                # Things without _meta aren't functional models, so they're
-                # uninteresting parents.
-                continue
-            # if base._meta.schema != new_class._meta.schema:
-            #     raise Exception('The parent schema is not the same')
-
-            parent_fields = base._meta.local_fields
-            # Check for clashes between locally declared fields and those
-            # on the base classes (we cannot handle shadowed fields at the
-            # moment).
-            for field in parent_fields:
-                if field.name in field_names and field.type.__class__ != field_names[
-                        field.name].type.__class__:
-                    raise Exception(
-                        'Local field %r in class %r (%r) clashes '
-                        'with field with similar name from '
-                        'Interface %s (%r)' % (
-                            field.name,
-                            new_class.__name__,
-                            field.__class__,
-                            base.__name__,
-                            field_names[field.name].__class__)
-                    )
-                new_field = copy.copy(field)
-                new_class.add_to_class(field.attname, new_field)
-
-            new_class._meta.parents.append(base)
-            if base._meta.is_interface:
-                new_class._meta.interfaces.append(base)
-            # new_class._meta.parents.extend(base._meta.parents)
-
-        setattr(new_class, 'NonNull', NonNull(new_class))
-        setattr(new_class, 'List', List(new_class))
-
-        new_class._prepare()
-        return new_class
-
-    def add_extra_fields(cls):
-        pass
-
-    def _prepare(cls):
-        if hasattr(cls, '_prepare_class'):
-            cls._prepare_class()
-        signals.class_prepared.send(cls)
-
-    def add_to_class(cls, name, value):
-        # We should call the contribute_to_class method only if it's bound
-        if not inspect.isclass(value) and hasattr(
-                value, 'contribute_to_class'):
-            value.contribute_to_class(cls, name)
-        else:
-            setattr(cls, name, value)
-
-
-class BaseObjectType(BaseType):
-
-    def __new__(cls, *args, **kwargs):
-        if cls._meta.is_interface:
-            raise Exception("An interface cannot be initialized")
-        elif cls._meta.is_union:
-            raise Exception("An union cannot be initialized")
-        elif cls._meta.abstract:
-            raise Exception("An abstract ObjectType cannot be initialized")
-        return super(BaseObjectType, cls).__new__(cls)
-
-    def __init__(self, *args, **kwargs):
-        signals.pre_init.send(self.__class__, args=args, kwargs=kwargs)
-        self._root = kwargs.pop('_root', None)
-        args_len = len(args)
-        fields = self._meta.fields
-        if args_len > len(fields):
-            # Daft, but matches old exception sans the err msg.
-            raise IndexError("Number of args exceeds number of fields")
-        fields_iter = iter(fields)
-
-        if not kwargs:
-            for val, field in zip(args, fields_iter):
-                setattr(self, field.attname, val)
-        else:
-            for val, field in zip(args, fields_iter):
-                setattr(self, field.attname, val)
-                kwargs.pop(field.attname, None)
-
-        for field in fields_iter:
-            try:
-                val = kwargs.pop(field.attname)
-                setattr(self, field.attname, val)
-            except KeyError:
-                pass
-
-        if kwargs:
-            for prop in list(kwargs):
-                try:
-                    if isinstance(getattr(self.__class__, prop), property):
-                        setattr(self, prop, kwargs.pop(prop))
-                except AttributeError:
-                    pass
-            if kwargs:
-                raise TypeError(
-                    "'%s' is an invalid keyword argument for this function" %
-                    list(kwargs)[0])
-
-        signals.post_init.send(self.__class__, instance=self)
-
-    @classmethod
-    def _resolve_type(cls, schema, instance, *args):
-        return schema.T(instance.__class__)
-
-    @classmethod
-    def internal_type(cls, schema):
-        if cls._meta.abstract:
-            raise Exception("Abstract ObjectTypes don't have a specific type.")
-
-        if cls._meta.is_interface:
-            return GraphQLInterfaceType(
-                cls._meta.type_name,
-                description=cls._meta.description,
-                resolve_type=partial(cls._resolve_type, schema),
-                fields=partial(cls.get_fields, schema)
-            )
-        elif cls._meta.is_union:
-            return GraphQLUnionType(
-                cls._meta.type_name,
-                types=cls._meta.types,
-                description=cls._meta.description,
-            )
-        return GraphQLObjectType(
-            cls._meta.type_name,
-            description=cls._meta.description,
-            interfaces=[schema.T(i) for i in cls._meta.interfaces],
-            fields=partial(cls.get_fields, schema),
-            is_type_of=getattr(cls, 'is_type_of', None)
-        )
-
-    @classmethod
-    def get_fields(cls, schema):
-        fields = []
-        for field in cls._meta.fields:
-            try:
-                fields.append((field.name, schema.T(field)))
-            except SkipField:
-                continue
-
-        return OrderedDict(fields)
-
-    @classmethod
-    def wrap(cls, instance, args, info):
-        return cls(_root=instance)
-
-
-class Interface(six.with_metaclass(ObjectTypeMeta, BaseObjectType)):
-    pass
-
-
-class ObjectType(six.with_metaclass(ObjectTypeMeta, BaseObjectType)):
-    pass
-
-
-class Mutation(six.with_metaclass(ObjectTypeMeta, BaseObjectType)):
-
-    @classmethod
-    def _construct_arguments(cls, items):
-        return ArgumentsGroup(**items)
-
-    @classmethod
-    def _prepare_class(cls):
-        input_class = getattr(cls, 'Input', None)
-        if input_class:
-            items = dict(vars(input_class))
-            items.pop('__dict__', None)
-            items.pop('__doc__', None)
-            items.pop('__module__', None)
-            items.pop('__weakref__', None)
-            cls.add_to_class('arguments', cls._construct_arguments(items))
-            delattr(cls, 'Input')
-
-    @classmethod
-    def get_arguments(cls):
-        return cls.arguments
-
-
-class InputObjectType(ObjectType):
-
-    @classmethod
-    def internal_type(cls, schema):
-        return GraphQLInputObjectType(
-            cls._meta.type_name,
-            description=cls._meta.description,
-            fields=partial(cls.get_fields, schema),
-        )

graphene/core/types/tests/test_objecttype.py

@@ -1,194 +0,0 @@
-from graphql.core.execution.middlewares.utils import (resolver_has_tag,
-                                                      tag_resolver)
-from graphql.core.type import (GraphQLInterfaceType, GraphQLObjectType,
-                               GraphQLUnionType)
-from py.test import raises
-
-from graphene.core.schema import Schema
-from graphene.core.types import Int, Interface, ObjectType, String
-
-
-class Character(Interface):
-    '''Character description'''
-    name = String()
-
-    class Meta:
-        type_name = 'core_Character'
-
-
-class Human(Character):
-    '''Human description'''
-    friends = String()
-
-    class Meta:
-        type_name = 'core_Human'
-
-    @property
-    def readonly_prop(self):
-        return 'readonly'
-
-    @property
-    def write_prop(self):
-        return self._write_prop
-
-    @write_prop.setter
-    def write_prop(self, value):
-        self._write_prop = value
-
-
-class Droid(Character):
-    '''Droid description'''
-
-
-class CharacterType(Droid, Human):
-    '''Union Type'''
-
-schema = Schema()
-
-
-def test_interface():
-    object_type = schema.T(Character)
-    assert Character._meta.is_interface is True
-    assert isinstance(object_type, GraphQLInterfaceType)
-    assert Character._meta.type_name == 'core_Character'
-    assert object_type.description == 'Character description'
-    assert list(object_type.get_fields().keys()) == ['name']
-
-
-def test_interface_cannot_initialize():
-    with raises(Exception) as excinfo:
-        Character()
-    assert 'An interface cannot be initialized' == str(excinfo.value)
-
-
-def test_union():
-    object_type = schema.T(CharacterType)
-    assert CharacterType._meta.is_union is True
-    assert isinstance(object_type, GraphQLUnionType)
-    assert object_type.description == 'Union Type'
-
-
-def test_union_cannot_initialize():
-    with raises(Exception) as excinfo:
-        CharacterType()
-    assert 'An union cannot be initialized' == str(excinfo.value)
-
-
-def test_interface_resolve_type():
-    resolve_type = Character._resolve_type(schema, Human(object()))
-    assert isinstance(resolve_type, GraphQLObjectType)
-
-
-def test_object_type():
-    object_type = schema.T(Human)
-    assert Human._meta.is_interface is False
-    assert Human._meta.type_name == 'core_Human'
-    assert isinstance(object_type, GraphQLObjectType)
-    assert object_type.description == 'Human description'
-    assert list(object_type.get_fields().keys()) == ['name', 'friends']
-    assert object_type.get_interfaces() == [schema.T(Character)]
-    assert Human._meta.fields_map['name'].object_type == Human
-
-
-def test_object_type_container():
-    h = Human(name='My name')
-    assert h.name == 'My name'
-
-
-def test_object_type_set_properties():
-    h = Human(readonly_prop='custom', write_prop='custom')
-    assert h.readonly_prop == 'readonly'
-    assert h.write_prop == 'custom'
-
-
-def test_object_type_container_invalid_kwarg():
-    with raises(TypeError):
-        Human(invalid='My name')
-
-
-def test_object_type_container_too_many_args():
-    with raises(IndexError):
-        Human('Peter', 'No friends :(', None)
-
-
-def test_field_clashes():
-    with raises(Exception) as excinfo:
-        class Droid(Character):
-            name = Int()
-
-    assert 'clashes' in str(excinfo.value)
-
-
-def test_fields_inherited_should_be_different():
-    assert Character._meta.fields_map['name'] != Human._meta.fields_map['name']
-
-
-def test_field_mantain_resolver_tags():
-    class Droid(Character):
-        name = String()
-
-        def resolve_name(self, *args):
-            return 'My Droid'
-
-        tag_resolver(resolve_name, 'test')
-
-    field = schema.T(Droid._meta.fields_map['name'])
-    assert resolver_has_tag(field.resolver, 'test')
-
-
-def test_type_has_nonnull():
-    class Droid(Character):
-        name = String()
-
-    assert Droid.NonNull.of_type == Droid
-
-
-def test_type_has_list():
-    class Droid(Character):
-        name = String()
-
-    assert Droid.List.of_type == Droid
-
-
-def test_abstracttype():
-    class MyObject1(ObjectType):
-        class Meta:
-            abstract = True
-        name1 = String()
-
-    class MyObject2(ObjectType):
-        class Meta:
-            abstract = True
-        name2 = String()
-
-    class MyObject(MyObject1, MyObject2):
-        pass
-
-    object_type = schema.T(MyObject)
-
-    assert list(MyObject._meta.fields_map.keys()) == ['name1', 'name2']
-    assert MyObject._meta.fields_map['name1'].object_type == MyObject
-    assert MyObject._meta.fields_map['name2'].object_type == MyObject
-    assert isinstance(object_type, GraphQLObjectType)
-
-
-def test_abstracttype_initialize():
-    class MyAbstractObjectType(ObjectType):
-        class Meta:
-            abstract = True
-
-    with raises(Exception) as excinfo:
-        MyAbstractObjectType()
-
-    assert 'An abstract ObjectType cannot be initialized' == str(excinfo.value)
-
-
-def test_abstracttype_type():
-    class MyAbstractObjectType(ObjectType):
-        class Meta:
-            abstract = True
-
-    with raises(Exception) as excinfo:
-        schema.T(MyAbstractObjectType)
-
-    assert 'Abstract ObjectTypes don\'t have a specific type.' == str(excinfo.value)

graphene/relay/fields.py

@@ -90,11 +90,5 @@ class GlobalIDField(Field):
     def __init__(self, *args, **kwargs):
         super(GlobalIDField, self).__init__(NonNull(ID()), *args, **kwargs)
 
-    def contribute_to_class(self, cls, name):
-        from graphene.relay.utils import is_node, is_node_type
-        in_node = is_node(cls) or is_node_type(cls)
-        assert in_node, 'GlobalIDField could only be inside a Node, but got %r' % cls
-        super(GlobalIDField, self).contribute_to_class(cls, name)
-
     def resolver(self, instance, args, info):
         return instance.to_global_id()

graphene/relay/types.py

@@ -3,11 +3,14 @@ import warnings
 from collections import Iterable
 from functools import wraps
 
+import six
 from graphql_relay.connection.arrayconnection import connection_from_list
 from graphql_relay.node.node import to_global_id
 
-from ..core.types import (Boolean, Field, InputObjectType, Interface, List,
+from ..core.classtypes import InputObjectType, Interface, Mutation, ObjectType
-                          Mutation, ObjectType, String)
+from ..core.classtypes.interface import InterfaceMeta
+from ..core.classtypes.mutation import MutationMeta
+from ..core.types import Boolean, Field, List, String
 from ..core.types.argument import ArgumentsGroup
 from ..core.types.definitions import NonNull
 from ..utils import memoize
@@ -83,13 +86,10 @@ class Connection(ObjectType):
         return self._connection_data
 
 
-class BaseNode(object):
+class NodeMeta(InterfaceMeta):
 
-    @classmethod
+    def construct_get_node(cls):
-    def _prepare_class(cls):
+        get_node = getattr(cls, 'get_node', None)
-        from graphene.relay.utils import is_node
-        if is_node(cls):
-            get_node = getattr(cls, 'get_node')
         assert get_node, 'get_node classmethod not found in %s Node' % cls
         assert callable(get_node), 'get_node have to be callable'
         args = 3
@@ -111,6 +111,20 @@ class BaseNode(object):
 
             setattr(cls, 'get_node', wrapped_node)
 
+    def construct(cls, *args, **kwargs):
+        cls = super(NodeMeta, cls).construct(*args, **kwargs)
+        if not cls._meta.abstract:
+            cls.construct_get_node()
+        return cls
+
+
+class Node(six.with_metaclass(NodeMeta, Interface)):
+    '''An object with an ID'''
+    id = GlobalIDField()
+
+    class Meta:
+        abstract = True
+
     def to_global_id(self):
         type_name = self._meta.type_name
         return to_global_id(type_name, self.id)
@@ -127,27 +141,32 @@ class BaseNode(object):
         return cls.edge_type
 
 
-class Node(BaseNode, Interface):
-    '''An object with an ID'''
-    id = GlobalIDField()
-
-
 class MutationInputType(InputObjectType):
     client_mutation_id = String(required=True)
 
 
-class ClientIDMutation(Mutation):
+class RelayMutationMeta(MutationMeta):
-    client_mutation_id = String(required=True)
 
-    @classmethod
+    def construct(cls, *args, **kwargs):
-    def _construct_arguments(cls, items):
+        cls = super(RelayMutationMeta, cls).construct(*args, **kwargs)
+        if not cls._meta.abstract:
             assert hasattr(
                 cls, 'mutate_and_get_payload'), 'You have to implement mutate_and_get_payload'
+        return cls
+
+    def construct_arguments(cls, items):
         new_input_type = type('{}Input'.format(
             cls._meta.type_name), (MutationInputType, ), items)
         cls.add_to_class('input_type', new_input_type)
         return ArgumentsGroup(input=NonNull(new_input_type))
 
+
+class ClientIDMutation(six.with_metaclass(RelayMutationMeta, Mutation)):
+    client_mutation_id = String(required=True)
+
+    class Meta:
+        abstract = True
+
     @classmethod
     def mutate(cls, instance, args, info):
         input = args.get('input')

graphene/relay/utils.py

@@ -1,10 +1,11 @@
-from .types import BaseNode
+from .types import Node
 
 
 def is_node(object_type):
     return object_type and issubclass(
-        object_type, BaseNode) and not is_node_type(object_type)
+        object_type, Node) and not object_type._meta.abstract
 
 
 def is_node_type(object_type):
-    return BaseNode in object_type.__bases__
+    return object_type and issubclass(
+        object_type, Node) and object_type._meta.abstract

graphene/signals.py

@@ -2,6 +2,7 @@ try:
     from blinker import Signal
 except ImportError:
     class Signal(object):
+
         def send(self, *args, **kwargs):
             pass