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102 lines
3.6 KiB
Python
102 lines
3.6 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, TestCase
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from django.test.utils import isolate_apps
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from .models import ManyToMany
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class ManyToManyFieldTests(SimpleTestCase):
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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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def test_invalid_to_parameter(self):
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msg = (
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"ManyToManyField(1) is invalid. First parameter to "
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"ManyToManyField must be either a model, a model name, or the "
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"string 'self'"
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)
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with self.assertRaisesMessage(TypeError, msg):
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class MyModel(models.Model):
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m2m = models.ManyToManyField(1)
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@isolate_apps('model_fields')
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def test_through_db_table_mutually_exclusive(self):
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class Child(models.Model):
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pass
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class Through(models.Model):
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referred = models.ForeignKey(Child, on_delete=models.CASCADE)
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referent = models.ForeignKey(Child, on_delete=models.CASCADE)
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msg = 'Cannot specify a db_table if an intermediary model is used.'
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with self.assertRaisesMessage(ValueError, msg):
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class MyModel(models.Model):
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m2m = models.ManyToManyField(
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Child,
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through='Through',
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db_table='custom_name',
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)
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class ManyToManyFieldDBTests(TestCase):
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def test_value_from_object_instance_without_pk(self):
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obj = ManyToMany()
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self.assertEqual(obj._meta.get_field('m2m').value_from_object(obj), [])
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def test_value_from_object_instance_with_pk(self):
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obj = ManyToMany.objects.create()
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related_obj = ManyToMany.objects.create()
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obj.m2m.add(related_obj)
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self.assertEqual(obj._meta.get_field('m2m').value_from_object(obj), [related_obj])
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