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
27114	Migrations: AttributeError: can't set attribute	sweaver360	nobody	"I just updated to Django 1.10 from Django 1.9.9, and when I ran my server it told me I needed to migrate due to a change in auth.  When I ran manage.py migrate, I get the following error:

{{{
vagrant@vagrant-box:~/website$ python manage.py migrate
System check identified some issues:

WARNINGS:
?: (mysql.W002) MySQL Strict Mode is not set for database connection 'default'
        HINT: MySQL's Strict Mode fixes many data integrity problems in MySQL, such as data truncation upon insertion, by escalating warnings into errors. It is strongly recommended you activate it. See: https://docs.djangoproject.com/en/1.10/ref/databases/#mys
ql-sql-mode
myapp.MyModel.my_field: (fields.W901) CommaSeparatedIntegerField has been deprecated. Support for it (except in historical migrations) will be removed in Django 2.0.
        HINT: Use CharField(validators=[validate_comma_separated_integer_list]) instead.
Operations to perform:
  Apply all migrations: [...]
Running migrations:
Traceback (most recent call last):
  File ""manage.py"", line 10, in <module>
    execute_from_command_line(sys.argv)
  File ""/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py"", line 367, in execute_from_command_line
    utility.execute()
  File ""/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py"", line 359, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""/usr/local/lib/python2.7/dist-packages/django/core/management/base.py"", line 305, in run_from_argv
    self.execute(*args, **cmd_options)
  File ""/usr/local/lib/python2.7/dist-packages/django/core/management/base.py"", line 356, in execute
    output = self.handle(*args, **options)
  File ""/usr/local/lib/python2.7/dist-packages/django/core/management/commands/migrate.py"", line 202, in handle
    targets, plan, fake=fake, fake_initial=fake_initial
  File ""/usr/local/lib/python2.7/dist-packages/django/db/migrations/executor.py"", line 97, in migrate
    state = self._migrate_all_forwards(plan, full_plan, fake=fake, fake_initial=fake_initial)
  File ""/usr/local/lib/python2.7/dist-packages/django/db/migrations/executor.py"", line 138, in _migrate_all_forwards
    migration.mutate_state(state, preserve=False)
  File ""/usr/local/lib/python2.7/dist-packages/django/db/migrations/migration.py"", line 92, in mutate_state
    operation.state_forwards(self.app_label, new_state)
  File ""/usr/local/lib/python2.7/dist-packages/django/db/migrations/operations/models.py"", line 733, in state_forwards
    state.reload_model(app_label, self.name_lower)
  File ""/usr/local/lib/python2.7/dist-packages/django/db/migrations/state.py"", line 162, in reload_model
    self.apps.render_multiple(states_to_be_rendered)
  File ""/usr/local/lib/python2.7/dist-packages/django/db/migrations/state.py"", line 277, in render_multiple
    model.render(self)
  File ""/usr/local/lib/python2.7/dist-packages/django/db/migrations/state.py"", line 559, in render
    body,
  File ""/usr/local/lib/python2.7/dist-packages/django/db/models/base.py"", line 157, in __new__
    new_class.add_to_class(obj_name, obj)
  File ""/usr/local/lib/python2.7/dist-packages/django/db/models/base.py"", line 316, in add_to_class
    value.contribute_to_class(cls, name)
  File ""/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py"", line 120, in contribute_to_class
    setattr(model, name, ManagerDescriptor(self))
AttributeError: can't set attribute
}}}

As far as I could tell, the code in the stack trace is all Django code, so I don't think it's a bad site package.  Is it possible that something in my code needs to change to prevent this error, or is this a Django bug?  Thanks. "	Bug	closed	Migrations	1.10	Normal	invalid	AttributeError Migrations 1.10		Unreviewed	0	0	0	0	0	0