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Fixed #23630 -- Made AlterModelTable rename auto-created M2M tables. 

Thanks Naddiseo for the report, Andrew Godwin for guidance,
and Shai Berger for review.
This commit is contained in:
Tim Graham 2014-10-22 09:59:00 -04:00
parent 22c85bf1a8
commit 41b337efa0
3 changed files with 46 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
django/db/migrations/operations/models.py
View File

@ -212,6 +212,14 @@ class AlterModelTable(Operation):
old_model._meta.db_table,
new_model._meta.db_table,
)
# Rename M2M fields whose name is based on this model's db_table
for (old_field, new_field) in zip(old_model._meta.local_many_to_many, new_model._meta.local_many_to_many):
if new_field.rel.through._meta.auto_created:
schema_editor.alter_db_table(
new_field.rel.through,
old_field.rel.through._meta.db_table,
new_field.rel.through._meta.db_table,
)
def database_backwards(self, app_label, schema_editor, from_state, to_state):
return self.database_forwards(app_label, schema_editor, from_state, to_state)

3
docs/releases/1.7.2.txt
View File

@ -9,4 +9,5 @@ Django 1.7.2 fixes several bugs in 1.7.1.
Bugfixes
========
* ... (:ticket:`00000`).
* Fixed migration's renaming of auto-created many-to-many tables when changing
:attr:`Meta.db_table <django.db.models.Options.db_table>` (:ticket:`23630`).

37
tests/migrations/test_operations.py
View File

@ -46,7 +46,9 @@ class OperationTestBase(MigrationTestBase):
operation.state_forwards(app_label, new_state)
return project_state, new_state
def set_up_test_model(self, app_label, second_model=False, third_model=False, related_model=False, mti_model=False, proxy_model=False, unique_together=False, options=False):
def set_up_test_model(self, app_label, second_model=False, third_model=False,
related_model=False, mti_model=False, proxy_model=False,
unique_together=False, options=False, db_table=None):
"""
Creates a test model state and database table.
"""
@ -82,6 +84,8 @@ class OperationTestBase(MigrationTestBase):
}
if options:
model_options["permissions"] = [("can_groom", "Can groom")]
if db_table:
model_options["db_table"] = db_table
operations = [migrations.CreateModel(
"Pony",
[
@ -875,6 +879,37 @@ class OperationTests(OperationTestBase):
operation.database_backwards("test_almota", editor, new_state, project_state)
self.assertTableExists("test_almota_pony")
def test_alter_model_table_m2m(self):
"""
AlterModelTable should rename auto-generated M2M tables.
"""
app_label = "test_talflmltlm2m"
pony_db_table = 'pony_foo'
project_state = self.set_up_test_model(app_label, second_model=True, db_table=pony_db_table)
# Add the M2M field
first_state = project_state.clone()
operation = migrations.AddField("Pony", "stables", models.ManyToManyField("Stable"))
operation.state_forwards(app_label, first_state)
with connection.schema_editor() as editor:
operation.database_forwards(app_label, editor, project_state, first_state)
original_m2m_table = "%s_%s" % (pony_db_table, "stables")
new_m2m_table = "%s_%s" % (app_label, "pony_stables")
self.assertTableExists(original_m2m_table)
self.assertTableNotExists(new_m2m_table)
# Rename the Pony db_table which should also rename the m2m table.
second_state = first_state.clone()
operation = migrations.AlterModelTable(name='pony', table=None)
operation.state_forwards(app_label, second_state)
with connection.schema_editor() as editor:
operation.database_forwards(app_label, editor, first_state, second_state)
self.assertTableExists(new_m2m_table)
self.assertTableNotExists(original_m2m_table)
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards(app_label, editor, second_state, first_state)
self.assertTableExists(original_m2m_table)
self.assertTableNotExists(new_m2m_table)
def test_alter_field(self):
"""
Tests the AlterField operation.