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