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Fixed #30591 -- Fixed recreation of foreign key constraints on MySQL when altering type of referenced unique field.

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Thanks Mariusz Felisiak for tests and Matthijs Kooijman for
investigation and initial patch.
This commit is contained in:
Adnan Umer 2019-08-22 14:46:17 +05:00 • committed by Mariusz Felisiak
parent b616908ce1
commit 241deed259
2 changed files with 52 additions and 3 deletions
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45
tests/migrations/test_operations.py
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@ -1308,6 +1308,51 @@ class OperationTests(OperationTestBase):
operation.database_backwards("test_alflpkfk", editor, new_state, project_state)
assertIdTypeEqualsFkType()
@skipUnlessDBFeature('supports_foreign_keys')
def test_alter_field_reloads_state_on_fk_with_to_field_target_type_change(self):
app_label = 'alter_field_reloads_state_on_fk_with_to_field_target_type_change'
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel('Rider', fields=[
('id', models.AutoField(primary_key=True)),
('code', models.PositiveIntegerField(unique=True)),
]),
migrations.CreateModel('Pony', fields=[
('id', models.AutoField(primary_key=True)),
('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE, to_field='code')),
]),
])
operation = migrations.AlterField(
'Rider',
'code',
models.CharField(max_length=100, unique=True),
)
self.apply_operations(app_label, project_state, operations=[operation])
@skipUnlessDBFeature('supports_foreign_keys')
def test_alter_field_reloads_state_on_fk_with_to_field_related_name_target_type_change(self):
app_label = 'alter_field_reloads_state_on_fk_with_to_field_rn_target_type_change'
project_state = self.apply_operations(app_label, ProjectState(), operations=[
migrations.CreateModel('Rider', fields=[
('id', models.AutoField(primary_key=True)),
('code', models.PositiveIntegerField(unique=True)),
]),
migrations.CreateModel('Pony', fields=[
('id', models.AutoField(primary_key=True)),
('rider', models.ForeignKey(
'%s.Rider' % app_label,
models.CASCADE,
to_field='code',
related_name='+',
)),
]),
])
operation = migrations.AlterField(
'Rider',
'code',
models.CharField(max_length=100, unique=True),
)
self.apply_operations(app_label, project_state, operations=[operation])
def test_alter_field_reloads_state_on_fk_target_changes(self):
"""
If AlterField doesn't reload state appropriately, the second AlterField