Improved Django integration with relations

graphene/contrib/django/converter.py

@@ -46,7 +46,11 @@ def _(field, cls):
 
 @convert_django_field.register(models.ManyToOneRel)
 def _(field, cls):
-    return ListField(DjangoModelField(field.related_model))
+    schema = cls._meta.schema
+    model_field = DjangoModelField(field.related_model)
+    if issubclass(cls, schema.relay.Node):
+        return schema.relay.ConnectionField(model_field)
+    return ListField(model_field)
 
 
 @convert_django_field.register(models.ForeignKey)

graphene/contrib/django/fields.py

@@ -10,7 +10,7 @@ def get_type_for_model(schema, model):
     for _type in types:
         type_model = getattr(_type._meta, 'model', None)
         if model == type_model:
-            return _type._meta.type
+            return _type
 
 
 class DjangoModelField(Field):
@@ -20,4 +20,13 @@ class DjangoModelField(Field):
 
     @cached_property
     def type(self):
-        return get_type_for_model(self.schema, self.model)
+        _type = self.get_object_type()
+        return _type and _type._meta.type
+
+    def get_object_type(self):
+        _type = get_type_for_model(self.schema, self.model)
+        if not _type and self.object_type._meta.only_fields:
+            # We will only raise the exception if the related field is specified in only_fields
+            raise Exception("Field %s (%s) model not mapped in current schema" % (self, self.model._meta.object_name))
+        
+        return _type

graphene/contrib/django/options.py

@@ -5,6 +5,7 @@ from graphene.core.options import Options
 
 VALID_ATTRS = ('model', 'only_fields')
 
+
 class DjangoOptions(Options):
     def __init__(self, *args, **kwargs):
         self.model = None

graphene/contrib/django/types.py

@@ -7,6 +7,7 @@ from graphene.contrib.django.converter import convert_django_field
 
 from graphene.relay import Node
 
+
 def get_reverse_fields(model):
     for name, attr in model.__dict__.items():
         related = getattr(attr, 'related', None)
@@ -16,12 +17,11 @@ def get_reverse_fields(model):
 
 class DjangoObjectTypeMeta(ObjectTypeMeta):
     options_cls = DjangoOptions
+
     def add_extra_fields(cls):
         if not cls._meta.model:
             return
-
         only_fields = cls._meta.only_fields
-        # print cls._meta.model._meta._get_fields(forward=False, reverse=True, include_hidden=True)
         reverse_fields = tuple(get_reverse_fields(cls._meta.model))
         for field in cls._meta.model._meta.fields + reverse_fields:
             if only_fields and field.name not in only_fields:

graphene/core/fields.py

@@ -48,6 +48,8 @@ class Field(object):
     def get_object_type(self):
         field_type = self.field_type
         _is_class = inspect.isclass(field_type)
+        if isinstance(field_type, Field):
+            return field_type.get_object_type()
         if _is_class and issubclass(field_type, ObjectType):
             return field_type
         elif isinstance(field_type, basestring):

graphene/core/options.py

@@ -11,19 +11,11 @@ class Options(object):
         self.local_fields = []
         self.interface = False
         self.proxy = False
-        self.schema = schema
+        self.schema = schema or get_global_schema()
         self.interfaces = []
         self.parents = []
         self.valid_attrs = DEFAULT_NAMES
     
-    # @property
-    # def schema(self):
-    #     return self._schema or get_global_schema()
-
-    # @schema.setter
-    # def schema(self, schema):
-    #     self._schema = schema
-    
     def contribute_to_class(self, cls, name):
         cls._meta = self
         self.parent = cls

graphene/relay/__init__.py

@@ -13,8 +13,10 @@ from graphene.relay.relay import (
 )
 
 from graphene.env import get_global_schema
+from graphene.relay.utils import setup
 
 schema = get_global_schema()
+setup(schema)
 relay = schema.relay
 
 Node, NodeField = relay.Node, relay.NodeField

graphene/relay/connections.py

@@ -7,7 +7,7 @@ from graphql_relay.connection.connection import (
 
 from graphene import signals
 from graphene.core.fields import NativeField
-from graphene.relay.utils import get_relay
+from graphene.relay.utils import get_relay, setup
 from graphene.relay.relay import Relay
 
 
@@ -28,4 +28,4 @@ def object_type_created(object_type):
 
 @signals.init_schema.connect
 def schema_created(schema):
-    setattr(schema, 'relay', Relay(schema))
+    setup(schema)

graphene/relay/utils.py

@@ -1,3 +1,9 @@
-
 def get_relay(schema):
     return getattr(schema, 'relay', None)
+
+
+def setup(schema):
+	from graphene.relay.relay import Relay
+	if not hasattr(schema, 'relay'):
+		return setattr(schema, 'relay', Relay(schema))
+	return schema

tests/contrib_django/test_schema.py

@@ -25,12 +25,31 @@ def test_should_raise_if_model_is_invalid():
     assert 'not a Django model' in str(excinfo.value)
 
 
+def test_should_raise_if_model_is_invalid():
+    with raises(Exception) as excinfo:
+        class ReporterTypeError(DjangoObjectType):
+            class Meta:
+                model = Reporter
+                only_fields = ('articles', )
+
+        schema = graphene.Schema(query=ReporterTypeError)
+        query = '''
+            query ReporterQuery {
+              articles
+            }
+        '''
+        result = schema.execute(query)
+        assert not result.errors
+
+    assert 'articles (Article) model not mapped in current schema' in str(excinfo.value)
+
+
 def test_should_map_fields():
     class ReporterType(DjangoObjectType):
         class Meta:
             model = Reporter
 
-    class Query(graphene.ObjectType):
+    class Query2(graphene.ObjectType):
         reporter = graphene.Field(ReporterType)
 
         def resolve_reporter(self, *args, **kwargs):
@@ -52,7 +71,7 @@ def test_should_map_fields():
             'email': ''
         }
     }
-    Schema = graphene.Schema(query=Query)
+    Schema = graphene.Schema(query=Query2)
     result = Schema.execute(query)
     assert not result.errors
     assert result.data == expected
@@ -74,15 +93,18 @@ def test_should_node():
         def get_node(cls, id):
             return ReporterNodeType(Reporter(id=2, first_name='Cookie Monster'))
 
+        def resolve_articles(self, *args, **kwargs):
+            return [ArticleNodeType(Article(headline='Hi!'))]
+
     class ArticleNodeType(DjangoNode):
         class Meta:
             model = Article
 
         @classmethod
         def get_node(cls, id):
-            return ArticleNodeType(None)
+            return ArticleNodeType(Article(id=1, headline='Article node'))
 
-    class Query(graphene.ObjectType):
+    class Query1(graphene.ObjectType):
         node = relay.NodeField()
         reporter = graphene.Field(ReporterNodeType)
 
@@ -94,14 +116,24 @@ def test_should_node():
           reporter {
             id,
             first_name,
+            articles {
+              edges {
+                node {
+                  headline
+                }
+              }
+            }
             last_name,
             email
           }
-          aCustomNode: node(id:"UmVwb3J0ZXJOb2RlVHlwZToy") {
+          my_article: node(id:"QXJ0aWNsZU5vZGVUeXBlOjE=") {
             id
             ... on ReporterNodeType {
                 first_name
             }
+            ... on ArticleNodeType {
+                headline
+            }
           }
         }
     '''
@@ -110,14 +142,21 @@ def test_should_node():
             'id': 'UmVwb3J0ZXJOb2RlVHlwZTox',
             'first_name': 'ABA',
             'last_name': 'X',
-            'email': ''
+            'email': '',
+            'articles': {
+              'edges': [{
+                'node': {
+                  'headline': 'Hi!'
+                }
+              }]
+            },
         },
-        'aCustomNode': {
+        'my_article': {
-            'id': 'UmVwb3J0ZXJOb2RlVHlwZToy',
+            'id': 'QXJ0aWNsZU5vZGVUeXBlOjE=',
-            'first_name': 'Cookie Monster'
+            'headline': 'Article node'
         }
     }
-    Schema = graphene.Schema(query=Query)
+    Schema = graphene.Schema(query=Query1)
     result = Schema.execute(query)
     assert not result.errors
     assert result.data == expected

tests/starwars_relay/schema.py

@@ -1,5 +1,5 @@
 import graphene
-from graphene import resolve_only_args, relay
+from graphene import resolve_only_args
 
 from .data import (
     getFaction,
@@ -8,6 +8,9 @@ from .data import (
     getEmpire,
 )
 
+schema = graphene.Schema(name='Starwars Relay Schema')
+relay = schema.relay
+
 class Ship(relay.Node):
     '''A ship in the Star Wars saga'''
     name = graphene.StringField(description='The name of the ship.')
@@ -31,7 +34,7 @@ class Faction(relay.Node):
         return Faction(getFaction(id))
 
 
-class Query(graphene.ObjectType):
+class Query(schema.ObjectType):
     rebels = graphene.Field(Faction)
     empire = graphene.Field(Faction)
     node = relay.NodeField()
@@ -45,4 +48,4 @@ class Query(graphene.ObjectType):
         return Faction(getEmpire())
 
 
-schema = graphene.Schema(query=Query, name='Starwars Relay Schema')
+schema.query = Query