Error when running migrations on MySQL 8+ or MariaDB

Hi there,

I have an error I’m unable to fix.

Brand new virtualenv, new database. Mysql 5.5.42

When I’m trying to run migrations for django cms, I keep having an issue with 0008_auto_20150121_0059

Error message is ValueError: Found wrong number (0) of constraints for cms_page(publisher_is_draft, application_namespace)

Stack trace

(env) iMac-de-Louis:mysite louis$ python manage.py migrate cms 0008_auto_20150121_0059
Operations to perform:
  Target specific migration: 0008_auto_20150121_0059, from cms
Running migrations:
  Rendering model states... DONE
  Applying cms.0008_auto_20150121_0059...Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute_from_command_line
    utility.execute()
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 346, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/core/management/base.py", line 394, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/core/management/base.py", line 445, in execute
    output = self.handle(*args, **options)
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 222, in handle
    executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/db/migrations/executor.py", line 110, in migrate
    self.apply_migration(states[migration], migration, fake=fake, fake_initial=fake_initial)
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/db/migrations/executor.py", line 148, in apply_migration
    state = migration.apply(state, schema_editor)
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/db/migrations/migration.py", line 115, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/db/migrations/operations/models.py", line 359, in database_forwards
    getattr(new_model._meta, self.option_name, set()),
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 320, in alter_unique_together
    self._delete_composed_index(model, fields, {'unique': True}, self.sql_delete_unique)
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/db/backends/mysql/schema.py", line 80, in _delete_composed_index
    return super(DatabaseSchemaEditor, self)._delete_composed_index(model, fields, *args)
  File "/Users/louis/Documents/WebProjects/Python/carspotter_beta2/carspotterbeta2/env/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 349, in _delete_composed_index
    ", ".join(columns),
ValueError: Found wrong number (0) of constraints for cms_page(publisher_is_draft, application_namespace)

Pip freeze

cmsplugin-filer==1.0.1
Django==1.8.8
django-appconf==1.0.2
django-classy-tags==0.8.0
django-cms==3.2.5
django-compressor==2.1
django-extensions==1.6.1
django-filer==1.1.1
django-formtools==1.0
django-mptt==0.8.6
django-polymorphic==0.8.1
django-rest-swagger==0.3.10
django-reversion==1.8.7
django-sekizai==0.10.0
Django-Select2==4.3.2
django-treebeard==4.0.1
djangocms-admin-style==1.2.4
djangocms-attributes-field==0.1.1
djangocms-column==1.7.0
djangocms-googlemap==0.5.2
djangocms-inherit==0.2.2
djangocms-link==2.0.1
djangocms-style==1.7.0
djangocms-text-ckeditor==3.2.1
djangorestframework==3.2.5
drf-nested-routers==0.11.1
easy-thumbnails==2.3
html5lib==1.0b8
MySQL-python==1.2.5
Pillow==3.3.1
pytz==2016.6.1
PyYAML==3.12
rcssmin==1.0.6
rjsmin==1.0.12
six==1.10.0
Unidecode==0.4.19
wheel==0.26.0

The migration file content (relevant part):

migrations.AlterUniqueTogether(
            name='page',
            unique_together=set([('reverse_id', 'site', 'publisher_is_draft'), ('publisher_is_draft', 'site', 'application_namespace')]),
        )

What am I missing ? Packages incompatibility ? MySQL version issue ? Django version issue ? I even updated to Django 1.8.14 but still the same error.

Thanks !

[ursomniac]

If you hack the migration file 0002_auto_20140816_1918.py and change line 67 from:

unique_together=set([('publisher_is_draft', 'application_namespace'), ('reverse_id', 'site', 'publisher_is_draft')]),

to

unique_together=set([('publisher_is_draft', 'site', 'application_namespace'), ('reverse_id', 'site', 'publisher_is_draft')]),

the issue goes away. (For some reason the problem ONLY happened if I used MariaDB: MySQL and Postgres installed out-of-the-box.)

[adamth]

I was having the same issue and found that migrations will run using MySQL 5.7. I would get the error when using MySQL 8. HTH