1328297 - Enable migrations checks for custom management commands once on Django 1.10

Status: RESOLVED WONTFIX

(Tree Management :: Treeherder, defect, P3)

Description

[Ed Morley [:emorley]]

Django 1.10 added the ability for custom management commands to opt into migrations checks:
https://code.djangoproject.com/ticket/25304
https://github.com/django/django/commit/50931dfa5310d5ae1c6e2852d05bf1e86700827f

These checks output a warning when the management command is run, if there are outstanding unapplied migrations at that time (but doesn't stop them running). This can make any subsequent errors (in case of eg a new table having not been created) less confusing.

To enable these for our custom commands, we just need to add this to the command class:

    requires_migrations_checks = True

See:
https://docs.djangoproject.com/en/1.10/howto/custom-management-commands/#django.core.management.BaseCommand.requires_migrations_checks