mirror of
https://github.com/graphql-python/graphene.git
synced 2025-04-25 03:43:42 +03:00
d085c8852b
* Integrate async tests into main code * Added full support for subscriptions * Fixed syntax using black * Fixed typo
130 lines
4.0 KiB
Python
130 lines
4.0 KiB
Python
from functools import partial
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from inspect import isclass
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from graphql_relay import from_global_id, to_global_id
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from ..types import ID, Field, Interface, ObjectType
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from ..types.interface import InterfaceOptions
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from ..types.utils import get_type
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def is_node(objecttype):
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"""
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Check if the given objecttype has Node as an interface
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"""
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if not isclass(objecttype):
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return False
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if not issubclass(objecttype, ObjectType):
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return False
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for i in objecttype._meta.interfaces:
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if issubclass(i, Node):
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return True
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return False
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class GlobalID(Field):
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def __init__(self, node=None, parent_type=None, required=True, *args, **kwargs):
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super(GlobalID, self).__init__(ID, required=required, *args, **kwargs)
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self.node = node or Node
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self.parent_type_name = parent_type._meta.name if parent_type else None
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@staticmethod
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def id_resolver(parent_resolver, node, root, info, parent_type_name=None, **args):
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type_id = parent_resolver(root, info, **args)
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parent_type_name = parent_type_name or info.parent_type.name
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return node.to_global_id(parent_type_name, type_id) # root._meta.name
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def wrap_resolve(self, parent_resolver):
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return partial(
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self.id_resolver,
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parent_resolver,
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self.node,
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parent_type_name=self.parent_type_name,
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)
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class NodeField(Field):
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def __init__(self, node, type_=False, **kwargs):
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assert issubclass(node, Node), "NodeField can only operate in Nodes"
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self.node_type = node
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self.field_type = type_
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super(NodeField, self).__init__(
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# If we don's specify a type, the field type will be the node
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# interface
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type_ or node,
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id=ID(required=True, description="The ID of the object"),
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**kwargs,
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)
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def wrap_resolve(self, parent_resolver):
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return partial(self.node_type.node_resolver, get_type(self.field_type))
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class AbstractNode(Interface):
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class Meta:
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abstract = True
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@classmethod
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def __init_subclass_with_meta__(cls, **options):
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_meta = InterfaceOptions(cls)
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_meta.fields = {"id": GlobalID(cls, description="The ID of the object")}
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super(AbstractNode, cls).__init_subclass_with_meta__(_meta=_meta, **options)
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class Node(AbstractNode):
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"""An object with an ID"""
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@classmethod
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def Field(cls, *args, **kwargs): # noqa: N802
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return NodeField(cls, *args, **kwargs)
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@classmethod
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def node_resolver(cls, only_type, root, info, id):
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return cls.get_node_from_global_id(info, id, only_type=only_type)
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@classmethod
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def get_node_from_global_id(cls, info, global_id, only_type=None):
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try:
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_type, _id = cls.from_global_id(global_id)
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except Exception as e:
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raise Exception(
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(
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f'Unable to parse global ID "{global_id}". '
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'Make sure it is a base64 encoded string in the format: "TypeName:id". '
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f"Exception message: {str(e)}"
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)
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)
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graphene_type = info.schema.get_type(_type)
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if graphene_type is None:
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raise Exception(f'Relay Node "{_type}" not found in schema')
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graphene_type = graphene_type.graphene_type
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if only_type:
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assert (
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graphene_type == only_type
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), f"Must receive a {only_type._meta.name} id."
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# We make sure the ObjectType implements the "Node" interface
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if cls not in graphene_type._meta.interfaces:
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raise Exception(
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f'ObjectType "{_type}" does not implement the "{cls}" interface.'
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)
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get_node = getattr(graphene_type, "get_node", None)
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if get_node:
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return get_node(info, _id)
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@classmethod
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def from_global_id(cls, global_id):
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return from_global_id(global_id)
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@classmethod
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def to_global_id(cls, type_, id):
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return to_global_id(type_, id)
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