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
25216	DB migration bug in 1.8.3 when creating ManyToMany relation.	Chen	nobody	"Hi,
I am using python version 3.4 and django 1.8.3, I have the following very simple code:
{{{
from django.contrib.auth.models import User

class Agent(models.Model):

    name = models.CharField(max_length=100, primary_key=True)
    users = models.ManyToManyField(User, related_name='accessible_agents', default=[])
}}}
and when I have an empty database, and do python manage.py migrate.

It gives me error, and I tested on 1.7.8, it works fine.
{{{
Operations to perform:
  Synchronize unmigrated apps: staticfiles, download, messages
  Apply all migrations: admin, auth, contenttypes, sessions
Synchronizing apps without migrations:
  Creating tables...
    Creating table download_agent
    Running deferred SQL...
Traceback (most recent call last):
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/utils.py"", line 62, in execute
    return self.cursor.execute(sql)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/mysql/base.py"", line 124, in execute
    return self.cursor.execute(query, args)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py"", line 220, in execute
    self.errorhandler(self, exc, value)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/connections.py"", line 36, in defaulterrorhandler
    raise errorvalue
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py"", line 209, in execute
    r = self._query(query)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py"", line 371, in _query
    rowcount = self._do_query(q)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py"", line 335, in _do_query
    db.query(q)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/connections.py"", line 280, in query
    _mysql.connection.query(self, query)
_mysql_exceptions.OperationalError: (1005, ""Can't create table 'portal_aperture.#sql-403_b3' (errno: 150)"")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File ""manage.py"", line 10, in <module>
    execute_from_command_line(sys.argv)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/__init__.py"", line 338, in execute_from_command_line
    utility.execute()
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/__init__.py"", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/base.py"", line 393, in run_from_argv
    self.execute(*args, **cmd_options)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/base.py"", line 444, in execute
    output = self.handle(*args, **options)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/commands/migrate.py"", line 179, in handle
    created_models = self.sync_apps(connection, executor.loader.unmigrated_apps)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/core/management/commands/migrate.py"", line 317, in sync_apps
    cursor.execute(statement)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/utils.py"", line 79, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/utils.py"", line 64, in execute
    return self.cursor.execute(sql, params)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/utils.py"", line 97, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/utils/six.py"", line 658, in reraise
    raise value.with_traceback(tb)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/utils.py"", line 62, in execute
    return self.cursor.execute(sql)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/django/db/backends/mysql/base.py"", line 124, in execute
    return self.cursor.execute(query, args)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py"", line 220, in execute
    self.errorhandler(self, exc, value)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/connections.py"", line 36, in defaulterrorhandler
    raise errorvalue
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py"", line 209, in execute
    r = self._query(query)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py"", line 371, in _query
    rowcount = self._do_query(q)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/cursors.py"", line 335, in _do_query
    db.query(q)
  File ""/srv/company/virtualenvs/portal_aperture/lib/python3.4/site-packages/MySQLdb/connections.py"", line 280, in query
    _mysql.connection.query(self, query)
django.db.utils.OperationalError: (1005, ""Can't create table 'portal_aperture.#sql-403_b3' (errno: 150)"")
}}}
Thanks."	Bug	new	Migrations	1.8	Normal		migrate		Unreviewed	0	0	0	0	0	0