id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
27750	TypeError when running manage.py migrate	Henrique Chehad	nobody	"Hello,

Is returning this error when I try to run ./manage.py migrate in a model:

Model:

{{{
class Cast(models.Model):
    movie = models.ForeignKey(""movies.Movie"")
    artist = models.ForeignKey(""artists.Artist"", db_column=""actor_id"")
}}}

Migration:
{{{
        migrations.AlterField(
            model_name='cast',
            name='artist',
            field=models.ForeignKey(db_column='actor_id', on_delete=django.db.models.deletion.CASCADE, to='artists.Artist'),
        ),
}}}

Error:

{{{
Traceback (most recent call last):
  File ""manage.py"", line 10, in <module>
    execute_from_command_line(sys.argv)
  File ""/usr/local/lib/python3.5/site-packages/django/core/management/__init__.py"", line 353, in execute_from_command_line
    utility.execute()
  File ""/usr/local/lib/python3.5/site-packages/django/core/management/__init__.py"", line 345, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""/usr/local/lib/python3.5/site-packages/django/core/management/base.py"", line 348, in run_from_argv
    self.execute(*args, **cmd_options)
  File ""/usr/local/lib/python3.5/site-packages/raven/contrib/django/management/__init__.py"", line 41, in new_execute
    return original_func(self, *args, **kwargs)
  File ""/usr/local/lib/python3.5/site-packages/django/core/management/base.py"", line 399, in execute
    output = self.handle(*args, **options)
  File ""/usr/local/lib/python3.5/site-packages/django/core/management/commands/migrate.py"", line 200, in handle
    executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
  File ""/usr/local/lib/python3.5/site-packages/django/db/migrations/executor.py"", line 92, in migrate
    self._migrate_all_forwards(plan, full_plan, fake=fake, fake_initial=fake_initial)
  File ""/usr/local/lib/python3.5/site-packages/django/db/migrations/executor.py"", line 121, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File ""/usr/local/lib/python3.5/site-packages/django/db/migrations/executor.py"", line 198, in apply_migration
    state = migration.apply(state, schema_editor)
  File ""/usr/local/lib/python3.5/site-packages/django/db/migrations/migration.py"", line 123, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File ""/usr/local/lib/python3.5/site-packages/django/db/migrations/operations/fields.py"", line 201, in database_forwards
    schema_editor.alter_field(from_model, from_field, to_field)
  File ""/usr/local/lib/python3.5/site-packages/django/db/backends/base/schema.py"", line 482, in alter_field
    old_db_params, new_db_params, strict)
  File ""/usr/local/lib/python3.5/site-packages/django/db/backends/postgresql/schema.py"", line 110, in _alter_field
    new_db_params, strict,
  File ""/usr/local/lib/python3.5/site-packages/django/db/backends/base/schema.py"", line 545, in _alter_field
    self.execute(self._rename_field_sql(model._meta.db_table, old_field, new_field, new_type))
  File ""/usr/local/lib/python3.5/site-packages/django/db/backends/base/schema.py"", line 867, in _rename_field_sql
    ""old_column"": self.quote_name(old_field.column),
  File ""/usr/local/lib/python3.5/site-packages/django/db/backends/base/schema.py"", line 113, in quote_name
    return self.connection.ops.quote_name(name)
  File ""/usr/local/lib/python3.5/site-packages/django/db/backends/postgresql/operations.py"", line 95, in quote_name
    if name.startswith('""') and name.endswith('""'):
TypeError: startswith first arg must be bytes or a tuple of bytes, not str
}}}

The error is in the field `artist` of `Cast` model, because I added a `print()` to discover what is the field with the error when call the function `quote_name` and printed `actor_id`. I commented this field in migration just to test and worked. 

Detail: I didn't changed anything in this fields, it's because when I migrated from Python 2.7.5 to Python 3.5 the verbose_name changed (removed the u"""") and asked to generate new migrations. I think it is unnecessary.



"	Bug	closed	Migrations	1.9	Normal	duplicate			Unreviewed	0	0	0	0	0	0