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https://github.com/graphql-python/graphene-django.git
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123 lines
4.4 KiB
Python
123 lines
4.4 KiB
Python
from collections import OrderedDict
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from django.utils.functional import SimpleLazyObject
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from graphene import Field
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from graphene.relay import Connection, Node
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from graphene.types.objecttype import ObjectType, ObjectTypeOptions
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from graphene.types.utils import yank_fields_from_attrs
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from .converter import convert_django_field_with_choices
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from .registry import Registry, get_global_registry
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from .utils import (DJANGO_FILTER_INSTALLED, get_model_fields,
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is_valid_django_model)
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def construct_fields(model, registry, only_fields, exclude_fields):
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_model_fields = get_model_fields(model)
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fields = OrderedDict()
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for name, field in _model_fields:
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is_not_in_only = only_fields and name not in only_fields
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# is_already_created = name in options.fields
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is_excluded = name in exclude_fields # or is_already_created
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# https://docs.djangoproject.com/en/1.10/ref/models/fields/#django.db.models.ForeignKey.related_query_name
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is_no_backref = str(name).endswith('+')
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if is_not_in_only or is_excluded or is_no_backref:
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# We skip this field if we specify only_fields and is not
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# in there. Or when we exclude this field in exclude_fields.
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# Or when there is no back reference.
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continue
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converted = convert_django_field_with_choices(field, registry)
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fields[name] = converted
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return fields
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class DjangoObjectTypeOptions(ObjectTypeOptions):
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model = None # type: Model
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registry = None # type: Registry
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connection = None # type: Type[Connection]
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filter_fields = ()
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class DjangoObjectType(ObjectType):
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@classmethod
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def __init_subclass_with_meta__(cls, model=None, registry=None, skip_registry=False,
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only_fields=(), exclude_fields=(), filter_fields=None, connection=None,
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connection_class=None, use_connection=None, interfaces=(), _meta=None, **options):
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assert is_valid_django_model(model), (
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'You need to pass a valid Django Model in {}.Meta, received "{}".'
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).format(cls.__name__, model)
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if not registry:
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registry = get_global_registry()
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assert isinstance(registry, Registry), (
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'The attribute registry in {} needs to be an instance of '
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'Registry, received "{}".'
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).format(cls.__name__, registry)
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if not DJANGO_FILTER_INSTALLED and filter_fields:
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raise Exception("Can only set filter_fields if Django-Filter is installed")
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django_fields = yank_fields_from_attrs(
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construct_fields(model, registry, only_fields, exclude_fields),
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_as=Field,
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)
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if use_connection is None and interfaces:
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use_connection = any((issubclass(interface, Node) for interface in interfaces))
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if use_connection and not connection:
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# We create the connection automatically
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if not connection_class:
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connection_class = Connection
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connection = connection_class.create_type(
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'{}Connection'.format(cls.__name__), node=cls)
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if connection is not None:
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assert issubclass(connection, Connection), (
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"The connection must be a Connection. Received {}"
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).format(connection.__name__)
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if not _meta:
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_meta = DjangoObjectTypeOptions(cls)
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_meta.model = model
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_meta.registry = registry
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_meta.filter_fields = filter_fields
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_meta.fields = django_fields
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_meta.connection = connection
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super(DjangoObjectType, cls).__init_subclass_with_meta__(_meta=_meta, interfaces=interfaces, **options)
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if not skip_registry:
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registry.register(cls)
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def resolve_id(self, info):
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return self.pk
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@classmethod
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def is_type_of(cls, root, info):
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if isinstance(root, SimpleLazyObject):
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root._setup()
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root = root._wrapped
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if isinstance(root, cls):
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return True
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if not is_valid_django_model(type(root)):
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raise Exception((
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'Received incompatible instance "{}".'
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).format(root))
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model = root._meta.model._meta.concrete_model
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return model == cls._meta.model
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@classmethod
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def get_node(cls, info, id):
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try:
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return cls._meta.model.objects.get(pk=id)
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except cls._meta.model.DoesNotExist:
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return None
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