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
23418	Classes embedded inside other classes are not serialized correctly	Dan Loewenherz	Markus Holtermann	"Simple example:

{{{
class Store(models.Model):
    @deconstructible
    class IgnoreFormatString(object):
        def __init__(self, s):
            self.s = s

        def __str__(self):
            return self.s

        def __mod__(self, k):
            return self

    name = models.CharField(max_length=64, null=True)
    rating = models.IntegerField(error_messages={'invalid': IgnoreFormatString(""You've entered an invalid value."")}, null=True)
}}}

The migration is created appropriately, but running it will fail with something like the following:

{{{

Traceback (most recent call last):
  File ""./manage.py"", line 10, in <module>
    execute_from_command_line(sys.argv)
  File ""my_project/lib/python2.7/site-packages/django/core/management/__init__.py"", line 385, in execute_from_command_line
    utility.execute()
  File ""my_project/lib/python2.7/site-packages/django/core/management/__init__.py"", line 377, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""my_project/lib/python2.7/site-packages/django/core/management/base.py"", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File ""my_project/lib/python2.7/site-packages/django/core/management/base.py"", line 338, in execute
    output = self.handle(*args, **options)
  File ""my_project/lib/python2.7/site-packages/django/core/management/commands/migrate.py"", line 63, in handle
    executor = MigrationExecutor(connection, self.migration_progress_callback)
  File ""my_project/lib/python2.7/site-packages/django/db/migrations/executor.py"", line 17, in __init__
    self.loader = MigrationLoader(self.connection)
  File ""my_project/lib/python2.7/site-packages/django/db/migrations/loader.py"", line 48, in __init__
    self.build_graph()
  File ""my_project/lib/python2.7/site-packages/django/db/migrations/loader.py"", line 173, in build_graph
    self.load_disk()
  File ""my_project/lib/python2.7/site-packages/django/db/migrations/loader.py"", line 103, in load_disk
    migration_module = import_module(""%s.%s"" % (module_name, migration_name))
  File ""/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py"", line 37, in import_module
    __import__(name)
  File ""my_project/app/migrations/0001_initial.py"", line 8, in <module>
    class Migration(migrations.Migration):
  File ""my_project/app/migrations/0001_initial.py"", line 19, in Migration
    ('rating', models.IntegerField(null=True, error_messages={b'invalid': app.models.IgnoreFormatString(b""You've entered an invalid value."")})),
AttributeError: 'module' object has no attribute 'IgnoreFormatString
}}}

Let me know if you need anything else to help diagnose the issue or have any questions. Cheers!"	Cleanup/optimization	closed	Migrations	1.7	Normal	fixed		info+coding@…	Unreviewed	1	0	0	0	0	0