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schema.py
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schema.py
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from django.db.models import Prefetch
import graphene
from graphene import ConnectionField, relay
from graphene_django.fields import DjangoConnectionField
import graphene_django_optimizer as gql_optimizer
from graphene_django_optimizer import OptimizedDjangoObjectType
from .models import (
DetailedItem,
ExtraDetailedItem,
Item,
RelatedItem,
UnrelatedModel,
SomeOtherItem,
OtherItem,
RelatedOneToManyItem,
)
def _prefetch_children(info, filter_input):
if filter_input is None:
filter_input = {}
gte = filter_input.get("value", {}).get("gte", 0)
return Prefetch(
"children",
queryset=gql_optimizer.query(Item.objects.filter(value__gte=int(gte)), info),
to_attr="gql_custom_filtered_children",
)
class RangeInput(graphene.InputObjectType):
gte = graphene.Field(graphene.Int)
class ItemFilterInput(graphene.InputObjectType):
value = graphene.Field(RangeInput)
class ItemInterface(graphene.Interface):
id = relay.GlobalID()
parent_id = relay.GlobalID()
foo = graphene.String()
title = graphene.String()
unoptimized_title = graphene.String()
item_type = graphene.String()
father = graphene.Field("tests.schema.ItemType")
all_children = graphene.List("tests.schema.ItemType")
children_names = graphene.String()
aux_children_names = graphene.String()
filtered_children = graphene.List(
"tests.schema.ItemType",
name=graphene.String(required=True),
)
aux_filtered_children = graphene.List(
"tests.schema.ItemType",
name=graphene.String(required=True),
)
children_custom_filtered = gql_optimizer.field(
ConnectionField("tests.schema.ItemConnection", filter_input=ItemFilterInput()),
prefetch_related=_prefetch_children,
)
def resolve_foo(root, info):
return "bar"
@gql_optimizer.resolver_hints(
model_field=lambda: "children",
)
def resolve_children_names(root, info):
return " ".join(item.name for item in root.children.all())
@gql_optimizer.resolver_hints(
prefetch_related="children",
)
def resolve_aux_children_names(root, info):
return " ".join(item.name for item in root.children.all())
@gql_optimizer.resolver_hints(
prefetch_related=lambda info, name: Prefetch(
"children",
queryset=gql_optimizer.query(Item.objects.filter(name=name), info),
to_attr="gql_filtered_children_" + name,
),
)
def resolve_filtered_children(root, info, name):
return getattr(root, "gql_filtered_children_" + name)
@gql_optimizer.resolver_hints(
prefetch_related=lambda info, name: Prefetch(
"children",
queryset=gql_optimizer.query(
Item.objects.filter(name=f"some_prefix {name}"), info
),
# Different queryset than resolve_filtered_children but same to_attr, on purpose
# to check equality of Prefetch is based only on to_attr attribute, as it is implemented in Django.
to_attr="gql_filtered_children_" + name,
),
)
def resolve_aux_filtered_children(root, info, name):
return getattr(root, "gql_filtered_children_" + name)
def resolve_children_custom_filtered(root, info, *_args):
return getattr(root, "gql_custom_filtered_children")
class BaseItemType(OptimizedDjangoObjectType):
title = gql_optimizer.field(
graphene.String(),
only="name",
)
father = gql_optimizer.field(
graphene.Field("tests.schema.ItemType"),
model_field="parent",
)
relay_all_children = DjangoConnectionField("tests.schema.ItemNode")
class Meta:
model = Item
fields = "__all__"
@gql_optimizer.resolver_hints(
model_field="children",
)
def resolve_relay_all_children(root, info, **kwargs):
return root.children.all()
class ItemNode(BaseItemType):
class Meta:
model = Item
fields = "__all__"
interfaces = (
graphene.relay.Node,
ItemInterface,
)
class SomeOtherItemType(OptimizedDjangoObjectType):
class Meta:
model = SomeOtherItem
fields = "__all__"
class OtherItemType(OptimizedDjangoObjectType):
class Meta:
model = OtherItem
fields = "__all__"
class ItemType(BaseItemType):
class Meta:
model = Item
fields = "__all__"
interfaces = (ItemInterface,)
class ItemConnection(graphene.relay.Connection):
class Meta:
node = ItemType
class DetailedInterface(graphene.Interface):
detail = graphene.String()
class DetailedItemType(ItemType):
class Meta:
model = DetailedItem
fields = "__all__"
interfaces = (ItemInterface, DetailedInterface)
class RelatedItemType(ItemType):
class Meta:
model = RelatedItem
fields = "__all__"
interfaces = (ItemInterface,)
class ExtraDetailedItemType(DetailedItemType):
class Meta:
model = ExtraDetailedItem
fields = "__all__"
interfaces = (ItemInterface,)
class RelatedOneToManyItemType(OptimizedDjangoObjectType):
class Meta:
model = RelatedOneToManyItem
fields = "__all__"
class UnrelatedModelType(OptimizedDjangoObjectType):
class Meta:
model = UnrelatedModel
fields = "__all__"
interfaces = (DetailedInterface,)
class DummyItemMutation(graphene.Mutation):
item = graphene.Field(ItemNode, description="The retrieved item.", required=False)
class Arguments:
item_id = graphene.ID(description="The ID of the item.")
class Meta:
description = "A dummy mutation that retrieves a given item node."
@staticmethod
def mutate(info, item_id):
return graphene.Node.get_node_from_global_id(info, item_id, only_type=ItemNode)
class Query(graphene.ObjectType):
items = graphene.List(ItemInterface, name=graphene.String(required=True))
relay_items = DjangoConnectionField(ItemNode)
other_items = graphene.List(OtherItemType)
some_other_items = graphene.List(SomeOtherItemType)
def resolve_items(root, info, name):
return gql_optimizer.query(Item.objects.filter(name=name), info)
def resolve_relay_items(root, info, **kwargs):
return gql_optimizer.query(Item.objects.all(), info)
def resolve_other_items(root, info):
return gql_optimizer.query(OtherItemType.objects.all(), info)
class Schema(graphene.Schema):
@property
def query_type(self):
return self.graphql_schema.get_type("Query")
@property
def mutation_type(self):
return self.graphql_schema.get_type("Mutation")
@property
def subscription_type(self):
return self.graphql_schema.get_type("Subscription")
def get_type(self, _type):
return self.graphql_schema.get_type(_type)
schema = Schema(query=Query, types=(UnrelatedModelType,), mutation=DummyItemMutation)