69 lines
2.4 KiB
Python
69 lines
2.4 KiB
Python
from django.apps import apps
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from django.db import models
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from django.test import SimpleTestCase
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from django.test.utils import isolate_apps
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class ManyToManyFieldTests(SimpleTestCase):
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@isolate_apps('model_fields')
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def test_value_from_object_instance_without_pk(self):
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class ManyToManyModel(models.Model):
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m2m = models.ManyToManyField('self', models.CASCADE)
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instance = ManyToManyModel()
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qs = instance._meta.get_field('m2m').value_from_object(instance)
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self.assertEqual(qs.model, ManyToManyModel)
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self.assertEqual(list(qs), [])
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def test_abstract_model_pending_operations(self):
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"""
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Many-to-many fields declared on abstract models should not add lazy
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relations to resolve relationship declared as string (#24215).
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"""
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pending_ops_before = list(apps._pending_operations.items())
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class AbstractManyToManyModel(models.Model):
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fk = models.ForeignKey('missing.FK', models.CASCADE)
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class Meta:
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abstract = True
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self.assertIs(AbstractManyToManyModel._meta.apps, apps)
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self.assertEqual(
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pending_ops_before,
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list(apps._pending_operations.items()),
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'Pending lookup added for a many-to-many field on an abstract model'
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)
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@isolate_apps('model_fields', 'model_fields.tests')
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def test_abstract_model_app_relative_foreign_key(self):
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class AbstractReferent(models.Model):
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reference = models.ManyToManyField('Referred', through='Through')
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class Meta:
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app_label = 'model_fields'
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abstract = True
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def assert_app_model_resolved(label):
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class Referred(models.Model):
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class Meta:
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app_label = label
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class Through(models.Model):
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referred = models.ForeignKey('Referred', on_delete=models.CASCADE)
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referent = models.ForeignKey('ConcreteReferent', on_delete=models.CASCADE)
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class Meta:
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app_label = label
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class ConcreteReferent(AbstractReferent):
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class Meta:
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app_label = label
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self.assertEqual(ConcreteReferent._meta.get_field('reference').related_model, Referred)
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self.assertEqual(ConcreteReferent.reference.through, Through)
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assert_app_model_resolved('model_fields')
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assert_app_model_resolved('tests')
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