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Improved types as containers
This commit is contained in:
Syrus Akbary
parent
2958cc18af
commit
129999d41a
72
README.md
72
README.md
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@ -1,10 +1,10 @@
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#  [Graphene](http://graphene-python.org) [](https://travis-ci.org/graphql-python/graphene) [](https://coveralls.io/github/graphql-python/graphene?branch=master)
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#  [Graphene](http://graphene-python.org) [](https://travis-ci.org/graphql-python/graphene) [](https://badge.fury.io/py/graphene) [](https://coveralls.io/github/graphql-python/graphene?branch=master)
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Graphene is a Python library for building GraphQL schemas/types fast and easily.
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* **Easy to use:** It maps the models/fields to internal GraphQL objects without effort.
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* **Relay:** Graphene has builtin support for Relay
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* **Django:** Automatic [Django models](#djangorelay-schema) conversion. *See an [example Django](http://github.com/graphql-python/swapi-graphene) implementation*
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* **Django:** Automatic *Django model* mapping to Graphene Types. *See an [example Django](http://github.com/graphql-python/swapi-graphene) implementation*
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## Installation
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@ -16,26 +16,21 @@ pip install graphene
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```
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## Usage
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## Examples
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Example code of a GraphQL schema using Graphene:
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### Schema definition
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Here is one example for get you started:
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```python
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class Character(graphene.Interface):
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id = graphene.IDField()
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name = graphene.StringField()
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friends = graphene.ListField('self')
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def resolve_friends(self, args, *_):
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return [Human(f) for f in self.instance.friends]
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class Human(Character):
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homePlanet = graphene.StringField()
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class Query(graphene.ObjectType):
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human = graphene.Field(Human)
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hello = graphene.StringField(description='A typical hello world')
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ping = graphene.StringField(description='Ping someone',
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to=graphene.Argument(graphene.String))
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def resolve_hello(self, args, info):
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return 'World'
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def resolve_ping(self, args, info):
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return 'Pinging {}'.format(args.get('to'))
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schema = graphene.Schema(query=Query)
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```
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@ -44,48 +39,19 @@ Then Querying `graphene.Schema` is as simple as:
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```python
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query = '''
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query HeroNameQuery {
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hero {
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name
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}
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query SayHello {
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hello
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ping(to:'peter')
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}
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'''
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result = schema.execute(query)
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```
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### Relay Schema
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If you want to learn even more, you can also check the following examples:
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Graphene also supports Relay, check the [Starwars Relay example](tests/starwars_relay)!
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* Relay Schema: [Starwars Relay example](tests/starwars_relay)
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* Django: [Starwars Django example](tests/starwars_django)
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```python
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class Ship(relay.Node):
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name = graphene.StringField()
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@classmethod
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def get_node(cls, id):
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return Ship(your_ship_instance)
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class Query(graphene.ObjectType):
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ships = relay.ConnectionField(Ship)
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node = relay.NodeField()
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```
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### Django+Relay Schema
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If you want to use graphene with your Django Models check the [Starwars Django example](tests/starwars_django)!
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```python
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class Ship(DjangoNode):
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class Meta:
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model = YourDjangoModelHere
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# only_fields = ('id', 'name') # Only map this fields from the model
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# exclude_fields ('field_to_exclude', ) # Exclude mapping this fields from the model
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class Query(graphene.ObjectType):
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node = relay.NodeField()
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```
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## Contributing
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@ -37,11 +37,20 @@ class DjangoObjectTypeMeta(ObjectTypeMeta):
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cls.add_to_class(field.name, converted_field)
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class DjangoObjectType(six.with_metaclass(DjangoObjectTypeMeta, BaseObjectType)):
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class InstanceObjectType(BaseObjectType):
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def __init__(self, instance=None):
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self.instance = instance
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super(InstanceObjectType, self).__init__()
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def __getattr__(self, attr):
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return getattr(self.instance, attr)
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class DjangoObjectType(six.with_metaclass(DjangoObjectTypeMeta, InstanceObjectType)):
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pass
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class DjangoInterface(six.with_metaclass(DjangoObjectTypeMeta, BaseObjectType)):
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class DjangoInterface(six.with_metaclass(DjangoObjectTypeMeta, InstanceObjectType)):
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pass
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@ -28,7 +28,7 @@ class Field(object):
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creation_counter = 0
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required = False
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def __init__(self, field_type, name=None, resolve=None, required=False, args=None, description='', **extra_args):
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def __init__(self, field_type, name=None, resolve=None, required=False, args=None, description='', default=None, **extra_args):
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self.field_type = field_type
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self.resolve_fn = resolve
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self.required = self.required or required
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@ -38,9 +38,13 @@ class Field(object):
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self.name = name
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self.description = description or self.__doc__
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self.object_type = None
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self.default = default
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self.creation_counter = Field.creation_counter
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Field.creation_counter += 1
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def get_default(self):
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return self.default
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def contribute_to_class(self, cls, name, add=True):
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if not self.name:
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self.name = to_camel_case(name)
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@ -57,7 +61,7 @@ class Field(object):
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if resolve_fn:
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return resolve_fn(instance, args, info)
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else:
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return getattr(instance, self.field_name, None)
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return getattr(instance, self.field_name, self.get_default())
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def get_resolve_fn(self, schema):
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object_type = self.get_object_type(schema)
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@ -129,29 +129,48 @@ class ObjectTypeMeta(type):
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class BaseObjectType(object):
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def __new__(cls, instance=None, **kwargs):
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def __new__(cls, *args, **kwargs):
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if cls._meta.is_interface:
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raise Exception("An interface cannot be initialized")
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if instance is None:
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if not kwargs:
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return None
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elif type(instance) is cls:
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return instance
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if not args and not kwargs:
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return None
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return super(BaseObjectType, cls).__new__(cls)
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def __init__(self, instance=None, **kwargs):
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signals.pre_init.send(self.__class__, instance=instance)
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assert instance or kwargs
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if not instance:
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init_kwargs = dict({k: None for k in self._meta.fields_map.keys()}, **kwargs)
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instance = self._meta.object(**init_kwargs)
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self.instance = instance
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signals.post_init.send(self.__class__, instance=self)
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def __init__(self, *args, **kwargs):
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signals.pre_init.send(self.__class__, args=args, kwargs=kwargs)
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args_len = len(args)
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fields = self._meta.fields
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if args_len > len(fields):
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# Daft, but matches old exception sans the err msg.
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raise IndexError("Number of args exceeds number of fields")
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fields_iter = iter(fields)
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def __getattr__(self, name):
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if self.instance:
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return getattr(self.instance, name)
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if not kwargs:
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for val, field in zip(args, fields_iter):
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setattr(self, field.field_name, val)
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else:
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for val, field in zip(args, fields_iter):
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setattr(self, field.field_name, val)
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kwargs.pop(field.field_name, None)
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for field in fields_iter:
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try:
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val = kwargs.pop(field.field_name)
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setattr(self, field.field_name, val)
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except KeyError:
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pass
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if kwargs:
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for prop in list(kwargs):
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try:
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if isinstance(getattr(self.__class__, prop), property):
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setattr(self, prop, kwargs.pop(prop))
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except AttributeError:
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pass
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if kwargs:
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raise TypeError("'%s' is an invalid keyword argument for this function" % list(kwargs)[0])
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signals.post_init.send(self.__class__, instance=self)
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@classmethod
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def fields_as_arguments(cls, schema):
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@ -32,21 +32,3 @@ def test_node_should_have_same_connection_always():
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def test_node_should_have_id_field():
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assert 'id' in OtherNode._meta.fields_map
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# def test_field_no_contributed_raises_error():
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# with raises(Exception) as excinfo:
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# class Ship(graphene.ObjectType):
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# name = graphene.StringField()
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# class Meta:
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# schema = schema
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# class Faction(relay.Node):
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# name = graphene.StringField()
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# ships = relay.ConnectionField(Ship)
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# @classmethod
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# def get_node(cls):
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# pass
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# class Meta:
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# schema = schema
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# assert 'same type_name' in str(excinfo.value)
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@ -1,4 +1,3 @@
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from pytest import raises
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from graphql.core.type import (
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GraphQLNonNull,
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GraphQLID
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@ -10,11 +9,6 @@ from graphene import relay
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schema = graphene.Schema()
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class MyType(object):
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name = 'my'
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arg = None
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class MyConnection(relay.Connection):
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my_custom_field = graphene.StringField(resolve=lambda instance, *_: 'Custom')
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@ -24,7 +18,7 @@ class MyNode(relay.Node):
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@classmethod
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def get_node(cls, id):
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return MyNode(MyType())
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return MyNode(name='mo')
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class Query(graphene.ObjectType):
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@ -32,10 +26,9 @@ class Query(graphene.ObjectType):
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all_my_nodes = relay.ConnectionField(MyNode, connection_type=MyConnection, customArg=graphene.Argument(graphene.String))
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def resolve_all_my_nodes(self, args, info):
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t = MyType()
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custom_arg = args.get('customArg')
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assert custom_arg == "1"
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return [MyNode(t)]
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return [MyNode(name='my')]
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schema.query = Query
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@ -61,7 +54,7 @@ def test_nodefield_query():
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'''
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expected = {
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'myNode': {
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'name': 'my'
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'name': 'mo'
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},
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'allMyNodes': {
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'edges': [{
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@ -1,77 +1,78 @@
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from collections import namedtuple
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humanData = {}
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droidData = {}
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Human = namedtuple('Human', 'id name friends appearsIn homePlanet')
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luke = Human(
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id='1000',
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name='Luke Skywalker',
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friends=['1002', '1003', '2000', '2001'],
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appearsIn=[4, 5, 6],
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homePlanet='Tatooine',
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)
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def setup():
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from .schema import Human, Droid
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global humanData, droidData
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luke = Human(
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id='1000',
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name='Luke Skywalker',
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friends=['1002', '1003', '2000', '2001'],
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appears_in=[4, 5, 6],
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home_planet='Tatooine',
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)
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vader = Human(
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id='1001',
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name='Darth Vader',
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friends=['1004'],
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appearsIn=[4, 5, 6],
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homePlanet='Tatooine',
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)
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vader = Human(
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id='1001',
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name='Darth Vader',
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friends=['1004'],
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appears_in=[4, 5, 6],
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home_planet='Tatooine',
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)
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han = Human(
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id='1002',
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name='Han Solo',
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friends=['1000', '1003', '2001'],
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appearsIn=[4, 5, 6],
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homePlanet=None,
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)
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han = Human(
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id='1002',
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name='Han Solo',
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friends=['1000', '1003', '2001'],
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appears_in=[4, 5, 6],
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home_planet=None,
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)
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leia = Human(
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id='1003',
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name='Leia Organa',
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friends=['1000', '1002', '2000', '2001'],
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appearsIn=[4, 5, 6],
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homePlanet='Alderaan',
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)
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leia = Human(
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id='1003',
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name='Leia Organa',
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friends=['1000', '1002', '2000', '2001'],
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appears_in=[4, 5, 6],
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home_planet='Alderaan',
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)
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tarkin = Human(
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id='1004',
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name='Wilhuff Tarkin',
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friends=['1001'],
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appearsIn=[4],
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homePlanet=None,
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)
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tarkin = Human(
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id='1004',
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name='Wilhuff Tarkin',
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friends=['1001'],
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appears_in=[4],
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home_planet=None,
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)
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humanData = {
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'1000': luke,
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'1001': vader,
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'1002': han,
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'1003': leia,
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'1004': tarkin,
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}
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humanData = {
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'1000': luke,
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'1001': vader,
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'1002': han,
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'1003': leia,
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'1004': tarkin,
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}
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Droid = namedtuple('Droid', 'id name friends appearsIn primaryFunction')
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threepio = Droid(
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id='2000',
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name='C-3PO',
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friends=['1000', '1002', '1003', '2001'],
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appears_in=[4, 5, 6],
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primary_function='Protocol',
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)
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threepio = Droid(
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id='2000',
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name='C-3PO',
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friends=['1000', '1002', '1003', '2001'],
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appearsIn=[4, 5, 6],
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primaryFunction='Protocol',
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)
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artoo = Droid(
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id='2001',
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name='R2-D2',
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friends=['1000', '1002', '1003'],
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appears_in=[4, 5, 6],
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primary_function='Astromech',
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)
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artoo = Droid(
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id='2001',
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name='R2-D2',
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friends=['1000', '1002', '1003'],
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appearsIn=[4, 5, 6],
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primaryFunction='Astromech',
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)
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droidData = {
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'2000': threepio,
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'2001': artoo,
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}
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droidData = {
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'2000': threepio,
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'2001': artoo,
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}
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def getCharacter(id):
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@ -84,8 +85,8 @@ def getFriends(character):
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def getHero(episode):
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if episode == 5:
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return luke
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return artoo
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return humanData['1000']
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return droidData['2001']
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def getHuman(id):
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|
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@ -2,7 +2,7 @@ from graphql.core.type import GraphQLEnumValue
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import graphene
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from graphene import resolve_only_args
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from .data import getHero, getHuman, getCharacter, getDroid, Human as _Human, Droid as _Droid
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from .data import getHero, getHuman, getCharacter, getDroid
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Episode = graphene.Enum('Episode', dict(
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NEWHOPE=GraphQLEnumValue(4),
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|
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@ -11,29 +11,23 @@ Episode = graphene.Enum('Episode', dict(
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))
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def wrap_character(character):
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if isinstance(character, _Human):
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return Human(character)
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elif isinstance(character, _Droid):
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return Droid(character)
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class Character(graphene.Interface):
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id = graphene.IDField()
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name = graphene.StringField()
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friends = graphene.ListField('self')
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appearsIn = graphene.ListField(Episode)
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appears_in = graphene.ListField(Episode)
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def resolve_friends(self, args, *_):
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return [wrap_character(getCharacter(f)) for f in self.instance.friends]
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# The character friends is a list of strings
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return [getCharacter(f) for f in self.friends]
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class Human(Character):
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homePlanet = graphene.StringField()
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home_planet = graphene.StringField()
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class Droid(Character):
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primaryFunction = graphene.StringField()
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primary_function = graphene.StringField()
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class Query(graphene.ObjectType):
|
||||
|
|
@ -52,15 +46,15 @@ class Query(graphene.ObjectType):
|
|||
|
||||
@resolve_only_args
|
||||
def resolve_hero(self, episode=None):
|
||||
return wrap_character(getHero(episode))
|
||||
return getHero(episode)
|
||||
|
||||
@resolve_only_args
|
||||
def resolve_human(self, id):
|
||||
return wrap_character(getHuman(id))
|
||||
return getHuman(id)
|
||||
|
||||
@resolve_only_args
|
||||
def resolve_droid(self, id):
|
||||
return wrap_character(getDroid(id))
|
||||
return getDroid(id)
|
||||
|
||||
|
||||
Schema = graphene.Schema(query=Query)
|
||||
|
|
|
|||
|
|
@ -1,6 +1,8 @@
|
|||
from .schema import Schema, Query
|
||||
from graphql.core import graphql
|
||||
from .data import setup
|
||||
|
||||
setup()
|
||||
|
||||
def test_hero_name_query():
|
||||
query = '''
|
||||
|
|
|
|||
|
|
@ -27,7 +27,7 @@ class Ship(DjangoNode):
|
|||
|
||||
|
||||
@schema.register
|
||||
class CharacterModel(DjangoObjectType):
|
||||
class Character(DjangoObjectType):
|
||||
class Meta:
|
||||
model = CharacterModel
|
||||
|
||||
|
|
|
|||
|
|
@ -1,78 +1,80 @@
|
|||
from collections import namedtuple
|
||||
data = {}
|
||||
|
||||
Ship = namedtuple('Ship', ['id', 'name'])
|
||||
Faction = namedtuple('Faction', ['id', 'name', 'ships'])
|
||||
|
||||
xwing = Ship(
|
||||
id='1',
|
||||
name='X-Wing',
|
||||
)
|
||||
def setup():
|
||||
global data
|
||||
|
||||
from .schema import Ship, Faction
|
||||
xwing = Ship(
|
||||
id='1',
|
||||
name='X-Wing',
|
||||
)
|
||||
|
||||
ywing = Ship(
|
||||
id='2',
|
||||
name='Y-Wing',
|
||||
)
|
||||
ywing = Ship(
|
||||
id='2',
|
||||
name='Y-Wing',
|
||||
)
|
||||
|
||||
awing = Ship(
|
||||
id='3',
|
||||
name='A-Wing',
|
||||
)
|
||||
awing = Ship(
|
||||
id='3',
|
||||
name='A-Wing',
|
||||
)
|
||||
|
||||
# Yeah, technically it's Corellian. But it flew in the service of the rebels,
|
||||
# so for the purposes of this demo it's a rebel ship.
|
||||
falcon = Ship(
|
||||
id='4',
|
||||
name='Millenium Falcon',
|
||||
)
|
||||
# Yeah, technically it's Corellian. But it flew in the service of the rebels,
|
||||
# so for the purposes of this demo it's a rebel ship.
|
||||
falcon = Ship(
|
||||
id='4',
|
||||
name='Millenium Falcon',
|
||||
)
|
||||
|
||||
homeOne = Ship(
|
||||
id='5',
|
||||
name='Home One',
|
||||
)
|
||||
homeOne = Ship(
|
||||
id='5',
|
||||
name='Home One',
|
||||
)
|
||||
|
||||
tieFighter = Ship(
|
||||
id='6',
|
||||
name='TIE Fighter',
|
||||
)
|
||||
tieFighter = Ship(
|
||||
id='6',
|
||||
name='TIE Fighter',
|
||||
)
|
||||
|
||||
tieInterceptor = Ship(
|
||||
id='7',
|
||||
name='TIE Interceptor',
|
||||
)
|
||||
tieInterceptor = Ship(
|
||||
id='7',
|
||||
name='TIE Interceptor',
|
||||
)
|
||||
|
||||
executor = Ship(
|
||||
id='8',
|
||||
name='Executor',
|
||||
)
|
||||
executor = Ship(
|
||||
id='8',
|
||||
name='Executor',
|
||||
)
|
||||
|
||||
rebels = Faction(
|
||||
id='1',
|
||||
name='Alliance to Restore the Republic',
|
||||
ships=['1', '2', '3', '4', '5']
|
||||
)
|
||||
rebels = Faction(
|
||||
id='1',
|
||||
name='Alliance to Restore the Republic',
|
||||
ships=['1', '2', '3', '4', '5']
|
||||
)
|
||||
|
||||
empire = Faction(
|
||||
id='2',
|
||||
name='Galactic Empire',
|
||||
ships=['6', '7', '8']
|
||||
)
|
||||
empire = Faction(
|
||||
id='2',
|
||||
name='Galactic Empire',
|
||||
ships=['6', '7', '8']
|
||||
)
|
||||
|
||||
data = {
|
||||
'Faction': {
|
||||
'1': rebels,
|
||||
'2': empire
|
||||
},
|
||||
'Ship': {
|
||||
'1': xwing,
|
||||
'2': ywing,
|
||||
'3': awing,
|
||||
'4': falcon,
|
||||
'5': homeOne,
|
||||
'6': tieFighter,
|
||||
'7': tieInterceptor,
|
||||
'8': executor
|
||||
data = {
|
||||
'Faction': {
|
||||
'1': rebels,
|
||||
'2': empire
|
||||
},
|
||||
'Ship': {
|
||||
'1': xwing,
|
||||
'2': ywing,
|
||||
'3': awing,
|
||||
'4': falcon,
|
||||
'5': homeOne,
|
||||
'6': tieFighter,
|
||||
'7': tieInterceptor,
|
||||
'8': executor
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
def createShip(shipName, factionId):
|
||||
|
|
@ -95,8 +97,8 @@ def getFaction(_id):
|
|||
|
||||
|
||||
def getRebels():
|
||||
return rebels
|
||||
return getFaction('1')
|
||||
|
||||
|
||||
def getEmpire():
|
||||
return empire
|
||||
return getFaction('2')
|
||||
|
|
|
|||
|
|
@ -12,29 +12,28 @@ schema = graphene.Schema(name='Starwars Relay Schema')
|
|||
|
||||
|
||||
class Ship(relay.Node):
|
||||
|
||||
'''A ship in the Star Wars saga'''
|
||||
name = graphene.StringField(description='The name of the ship.')
|
||||
|
||||
@classmethod
|
||||
def get_node(cls, id):
|
||||
return Ship(getShip(id))
|
||||
return getShip(id)
|
||||
|
||||
|
||||
class Faction(relay.Node):
|
||||
|
||||
'''A faction in the Star Wars saga'''
|
||||
name = graphene.StringField(description='The name of the faction.')
|
||||
ships = relay.ConnectionField(
|
||||
Ship, description='The ships used by the faction.')
|
||||
|
||||
@resolve_only_args
|
||||
def resolve_ships(self, **kwargs):
|
||||
return [Ship(getShip(ship)) for ship in self.instance.ships]
|
||||
def resolve_ships(self, **args):
|
||||
# Transform the instance ship_ids into real instances
|
||||
return [getShip(ship_id) for ship_id in self.ships]
|
||||
|
||||
@classmethod
|
||||
def get_node(cls, id):
|
||||
return Faction(getFaction(id))
|
||||
return getFaction(id)
|
||||
|
||||
|
||||
class Query(graphene.ObjectType):
|
||||
|
|
@ -44,11 +43,11 @@ class Query(graphene.ObjectType):
|
|||
|
||||
@resolve_only_args
|
||||
def resolve_rebels(self):
|
||||
return Faction(getRebels())
|
||||
return getRebels()
|
||||
|
||||
@resolve_only_args
|
||||
def resolve_empire(self):
|
||||
return Faction(getEmpire())
|
||||
return getEmpire()
|
||||
|
||||
|
||||
schema.query = Query
|
||||
|
|
|
|||
|
|
@ -1,61 +0,0 @@
|
|||
import graphene
|
||||
from graphene import resolve_only_args, relay
|
||||
|
||||
from .data import (
|
||||
getHero, getHuman, getCharacter, getDroid,
|
||||
Human as _Human, Droid as _Droid)
|
||||
|
||||
Episode = graphene.Enum('Episode', dict(
|
||||
NEWHOPE=4,
|
||||
EMPIRE=5,
|
||||
JEDI=6
|
||||
))
|
||||
|
||||
|
||||
def wrap_character(character):
|
||||
if isinstance(character, _Human):
|
||||
return Human(character)
|
||||
elif isinstance(character, _Droid):
|
||||
return Droid(character)
|
||||
|
||||
|
||||
class Character(graphene.Interface):
|
||||
name = graphene.StringField()
|
||||
friends = relay.Connection('Character')
|
||||
appearsIn = graphene.ListField(Episode)
|
||||
|
||||
def resolve_friends(self, args, *_):
|
||||
return [wrap_character(getCharacter(f)) for f in self.instance.friends]
|
||||
|
||||
|
||||
class Human(relay.Node, Character):
|
||||
homePlanet = graphene.StringField()
|
||||
|
||||
|
||||
class Droid(relay.Node, Character):
|
||||
primaryFunction = graphene.StringField()
|
||||
|
||||
|
||||
class Query(graphene.ObjectType):
|
||||
hero = graphene.Field(Character,
|
||||
episode=graphene.Argument(Episode))
|
||||
human = graphene.Field(Human,
|
||||
id=graphene.Argument(graphene.String))
|
||||
droid = graphene.Field(Droid,
|
||||
id=graphene.Argument(graphene.String))
|
||||
node = relay.NodeField()
|
||||
|
||||
@resolve_only_args
|
||||
def resolve_hero(self, episode):
|
||||
return wrap_character(getHero(episode))
|
||||
|
||||
@resolve_only_args
|
||||
def resolve_human(self, id):
|
||||
return wrap_character(getHuman(id))
|
||||
|
||||
@resolve_only_args
|
||||
def resolve_droid(self, id):
|
||||
return wrap_character(getDroid(id))
|
||||
|
||||
|
||||
Schema = graphene.Schema(query=Query)
|
||||
|
|
@ -1,7 +1,7 @@
|
|||
from pytest import raises
|
||||
from graphql.core import graphql
|
||||
|
||||
from .schema import schema
|
||||
from .data import setup
|
||||
|
||||
setup()
|
||||
|
||||
|
||||
def test_correct_fetch_first_ship_rebels():
|
||||
|
|
|
|||
|
|
@ -1,7 +1,7 @@
|
|||
from pytest import raises
|
||||
from graphql.core import graphql
|
||||
|
||||
from .schema import schema
|
||||
from .data import setup
|
||||
|
||||
setup()
|
||||
|
||||
|
||||
def test_correctly_fetches_id_name_rebels():
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user