#34820: Change the properties of ForeignObject object, such as blank, null, and
execute migrate to report an error
-------------------------------------+-------------------------------------
Reporter: | Owner: nobody
RelaxedDong |
Type: Bug | Status: new
Component: Database | Version: 4.2
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 1
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
… execute migrate to report an error
If the models.ForeignObject attribute is used, changing null or blank to
generate a new migration record will result in an error message when
executing the migrate again
```
File "/Users/donghao/test/test_migations/manage.py", line 22, in
<module>
execute_from_command_line(sys.argv)
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/core/management/__init__.py", line 442, in
execute_from_command_line
utility.execute()
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/core/management/__init__.py", line 436, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/core/management/base.py", line 412, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/core/management/base.py", line 458, in execute
output = self.handle(*args, **options)
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/core/management/base.py", line 106, in wrapper
res = handle_func(*args, **kwargs)
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/core/management/commands/migrate.py", line 356, in handle
post_migrate_state = executor.migrate(
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/db/migrations/executor.py", line 135, in migrate
state = self._migrate_all_forwards(
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/db/migrations/executor.py", line 167, in
_migrate_all_forwards
state = self.apply_migration(
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/db/migrations/executor.py", line 252, in apply_migration
state = migration.apply(state, schema_editor)
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/db/migrations/migration.py", line 132, in apply
operation.database_forwards(
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/db/migrations/operations/fields.py", line 235, in
database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/db/backends/base/schema.py", line 785, in alter_field
if not self._field_should_be_altered(old_field, new_field):
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/db/backends/base/schema.py", line 1530, in
_field_should_be_altered
return self.quote_name(old_field.column) != self.quote_name(
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/db/backends/base/schema.py", line 204, in quote_name
return self.connection.ops.quote_name(name)
File "/Users/donghao/.virtualenvs/simpleui/lib/python3.9/site-
packages/django/db/backends/mysql/operations.py", line 184, in quote_name
if name.startswith("`") and name.endswith("`"):
AttributeError: 'NoneType' object has no attribute 'startswith'
```
A pre judgment has been added here to avoid this issue
--
Ticket URL: <https://code.djangoproject.com/ticket/34820>
Django <https://code.djangoproject.com/>
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