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from django.apps.registry import Apps
from django.core import checks
from django.core.exceptions import ValidationError
from django.db import models
from django.db.migrations.writer import MigrationWriter
from django.db.models.query_utils import Q
from polymodels.fields import ContentTypeReference, PolymorphicTypeField
from polymodels.models import PolymorphicModel
from polymodels.utils import get_content_type
from .base import TestCase
from .models import AcknowledgedTrait, HugeSnake, Snake, Trait
class ContentTypeReferenceTests(TestCase):
reference = ContentTypeReference(str("tests"), str("snake"))
def test_equality(self):
self.assertEqual(self.reference, ContentTypeReference("tests", "snake"))
def test_retreival(self):
self.assertEqual(self.reference(), get_content_type(Snake).pk)
def test_repr(self):
self.assertEqual(repr(self.reference), "ContentTypeReference('tests', 'snake')")
class PolymorphicTypeFieldTests(TestCase):
def test_default_value(self):
"""
Make sure fields defaults
"""
trait = Trait.objects.create()
self.assertIsNone(trait.trait_type)
self.assertIsNone(trait.mammal_type)
self.assertEqual(trait.snake_type.model_class(), Snake)
def test_limit_choices_to(self):
"""
Make sure existing `limit_choices_to` are taken into consideration
"""
field = PolymorphicTypeField(Trait, on_delete=models.CASCADE)
remote_field = field.remote_field
subclasses_lookup = Trait.subclasses_lookup("pk")
self.assertEqual(remote_field.limit_choices_to(), subclasses_lookup)
# Test dict() limit_choices_to.
limit_choices_to = {"app_label": "polymodels"}
field = PolymorphicTypeField(
Trait, on_delete=models.CASCADE, limit_choices_to=limit_choices_to
)
remote_field = field.remote_field
self.assertEqual(
remote_field.limit_choices_to(), dict(subclasses_lookup, **limit_choices_to)
)
# Test Q() limit_choices_to.
field = PolymorphicTypeField(
Trait, on_delete=models.CASCADE, limit_choices_to=Q(**limit_choices_to)
)
remote_field = field.remote_field
self.assertEqual(
str(remote_field.limit_choices_to()),
str(Q(**limit_choices_to) & Q(**subclasses_lookup)),
)
def test_invalid_type(self):
trait = Trait.objects.create()
snake_type = get_content_type(Snake)
trait.mammal_type = snake_type
trait.snake_type = snake_type
with self.assertRaisesMessage(
ValidationError, "Specified content type is not of a subclass of Mammal."
):
trait.full_clean()
def test_valid_subclass(self):
trait = Trait.objects.create()
trait.snake_type = get_content_type(HugeSnake)
trait.full_clean()
def test_valid_proxy_subclass(self):
trait = Trait.objects.create()
trait.trait_type = get_content_type(AcknowledgedTrait)
trait.full_clean()
def test_description(self):
trait_type = Trait._meta.get_field("trait_type")
self.assertEqual(
trait_type.description % trait_type.__dict__,
"Content type of a subclass of Trait",
)
def test_checks(self):
test_apps = Apps(["tests", "django.contrib.contenttypes"])
class ContentType(models.Model):
class Meta:
apps = test_apps
app_label = "contenttypes"
class CheckModel(PolymorphicModel):
valid = PolymorphicTypeField("self", on_delete=models.CASCADE)
unresolved = PolymorphicTypeField("unresolved", on_delete=models.CASCADE)
non_polymorphic_base = PolymorphicTypeField(
"contenttypes.ContentType", on_delete=models.CASCADE
)
class Meta:
apps = test_apps
self.assertEqual(CheckModel._meta.get_field("valid").check(), [])
self.assertEqual(
CheckModel._meta.get_field("unresolved").check(),
[
checks.Error(
"Field defines a relation with model 'unresolved', which is either not installed, or is abstract.",
id="fields.E300",
),
],
)
self.assertEqual(
CheckModel._meta.get_field("non_polymorphic_base").check(),
[
checks.Error(
"The ContentType type is not a subclass of BasePolymorphicModel.",
id="polymodels.E004",
),
],
)
def test_formfield_issues_no_queries(self):
trait_type = Trait._meta.get_field("trait_type")
with self.assertNumQueries(0):
formfield = trait_type.formfield()
self.assertSetEqual(
set(formfield.queryset),
{
get_content_type(Trait),
get_content_type(AcknowledgedTrait),
},
)
def test_unresolved_relationship_formfield(self):
field = PolymorphicTypeField(
"Snake", to="app.Unresolved", on_delete=models.CASCADE
)
with self.assertRaises(ValueError):
field.formfield()
def safe_exec(self, string, value=None):
scope = {}
try:
exec(string, globals(), scope)
except Exception as e:
if value:
self.fail(
"Could not exec %r (from value %r): %s" % (string.strip(), value, e)
)
else:
self.fail("Could not exec %r: %s" % (string.strip(), e))
return scope
def serialize_round_trip(self, value):
string, imports = MigrationWriter.serialize(value)
return self.safe_exec(
"%s\ntest_value_result = %s" % ("\n".join(imports), string), value
)["test_value_result"]
def assertDeconstructionEqual(self, field, deconstructed):
self.assertEqual(field.deconstruct(), deconstructed)
self.assertEqual(field.clone().deconstruct()[1:], deconstructed[1:])
self.assertEqual(self.serialize_round_trip(deconstructed), deconstructed)
def test_field_deconstruction(self):
test_apps = Apps()
class Foo(PolymorphicModel):
foo = PolymorphicTypeField("self", on_delete=models.CASCADE)
class Meta:
apps = test_apps
app_label = "polymodels"
class Bar(models.Model):
foo = PolymorphicTypeField("Foo", on_delete=models.CASCADE)
foo_null = PolymorphicTypeField(Foo, on_delete=models.CASCADE, null=True)
foo_default = PolymorphicTypeField(
Foo, on_delete=models.CASCADE, default=get_content_type(Foo).pk
)
class Meta:
apps = test_apps
app_label = "polymodels"
self.assertDeconstructionEqual(
Foo._meta.get_field("foo"),
(
"foo",
"polymodels.fields.PolymorphicTypeField",
[],
{
"polymorphic_type": "polymodels.Foo",
"on_delete": models.CASCADE,
},
),
)
self.assertDeconstructionEqual(
Bar._meta.get_field("foo"),
(
"foo",
"polymodels.fields.PolymorphicTypeField",
[],
{
"polymorphic_type": "polymodels.Foo",
"on_delete": models.CASCADE,
},
),
)
self.assertDeconstructionEqual(
Bar._meta.get_field("foo_null"),
(
"foo_null",
"polymodels.fields.PolymorphicTypeField",
[],
{
"polymorphic_type": "polymodels.Foo",
"null": True,
"on_delete": models.CASCADE,
},
),
)
self.assertDeconstructionEqual(
Bar._meta.get_field("foo_default"),
(
"foo_default",
"polymodels.fields.PolymorphicTypeField",
[],
{
"polymorphic_type": "polymodels.Foo",
"default": get_content_type(Foo).pk,
"on_delete": models.CASCADE,
},
),
)
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