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from typing import TYPE_CHECKING, Optional, cast
import strawberry
from django.db import models
from strawberry import auto
from strawberry.types import get_object_definition
from strawberry.types.base import (
StrawberryList,
StrawberryOptional,
)
import strawberry_django
if TYPE_CHECKING:
from strawberry_django.fields.field import StrawberryDjangoField
class ParentModel(models.Model):
name = models.CharField(max_length=50)
class OneToOneModel(models.Model):
name = models.CharField(max_length=50)
parent = models.OneToOneField(
ParentModel,
on_delete=models.SET_NULL,
related_name="one_to_one",
null=True,
blank=True,
)
class ChildModel(models.Model):
name = models.CharField(max_length=50)
parents = models.ManyToManyField(ParentModel, related_name="children")
@strawberry_django.type(ParentModel)
class Parent:
id: auto
name: auto
children: list["Child"]
one_to_one: Optional["OneToOne"]
@strawberry_django.type(OneToOneModel)
class OneToOne:
id: auto
name: auto
parent: Optional["Parent"]
@strawberry_django.type(ChildModel)
class Child:
id: auto
name: auto
parents: list[Parent]
def test_relation():
assert [
(f.name, f.type, cast("StrawberryDjangoField", f).is_list)
for f in get_object_definition(Parent, strict=True).fields
] == [
("id", strawberry.ID, False),
("name", str, False),
("children", StrawberryList(Child), True),
("one_to_one", StrawberryOptional(OneToOne), False),
]
def test_reversed_relation():
assert [
(f.name, f.type, cast("StrawberryDjangoField", f).is_list)
for f in get_object_definition(Child, strict=True).fields
] == [
("id", strawberry.ID, False),
("name", str, False),
("parents", StrawberryList(Parent), True),
]
def test_relation_query(transactional_db):
@strawberry.type
class Query:
parent: Parent = strawberry_django.field()
one_to_one: OneToOne = strawberry_django.field()
schema = strawberry.Schema(query=Query)
query = """\
query Query ($pk: ID!) {
parent (pk: $pk) {
name
oneToOne {
name
}
children {
id
name
}
}
}
"""
parent = ParentModel.objects.create(name="Parent")
result = schema.execute_sync(query, {"pk": parent.pk})
assert result.errors is None
assert result.data == {
"parent": {"children": [], "name": "Parent", "oneToOne": None},
}
OneToOneModel.objects.create(name="OneToOne", parent=parent)
result = schema.execute_sync(query, {"pk": parent.pk})
assert result.errors is None
assert result.data == {
"parent": {"children": [], "name": "Parent", "oneToOne": {"name": "OneToOne"}},
}
child1 = ChildModel.objects.create(name="Child1")
child2 = ChildModel.objects.create(name="Child2")
ChildModel.objects.create(name="Child3")
child1.parents.add(parent)
child2.parents.add(parent)
result = schema.execute_sync(query, {"pk": parent.pk})
assert result.errors is None
assert result.data == {
"parent": {
"children": [{"id": "1", "name": "Child1"}, {"id": "2", "name": "Child2"}],
"name": "Parent",
"oneToOne": {"name": "OneToOne"},
},
}
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