Script to view any missing migrations for models. Will not work with native django migrations

view_migration_changes.py

# -*- coding: utf-8 -*-
from __future__ import print_function

import sys

from django.conf import settings
from django.core.management.base import NoArgsCommand

from south.exceptions import NoMigrations
from south.migration import Migrations
from south.creator import changes, actions, freezer


def empty(*args, **kwargs):
    pass


class Command(NoArgsCommand):
    can_import_settings = True
    help = "Checks for any new model changes"

    def handle_noargs(self, **options):
        for app in settings.INSTALLED_APPS:
            try:
                # Get the Migrations for this app (creating the migrations dir if needed)
                migrations = Migrations(app, force_creation=False, verbose_creation=1)
                last_migration = migrations[-1]
            except (NoMigrations, IndexError):
                continue
            except Exception as error:
                self.stderr.write(str(error))
                continue

            # Make sure it has stored models
            if migrations.app_label() not in getattr(last_migration.migration_class(), "complete_apps", []):
                self.stderr.write("You cannot use automatic detection, since the previous migration does not have this whole app frozen.\nEither make migrations using '--freeze %s' or set 'SOUTH_AUTO_FREEZE_APP = True' in your settings.py." % migrations.app_label())
            # Alright, construct two model dicts to run the differ on.
            old_defs = dict(
                (k, v) for k, v in last_migration.migration_class().models.items()
                if k.split(".")[0] == migrations.app_label()
            )
            new_defs = dict(
                (k, v) for k, v in freezer.freeze_apps([migrations.app_label()]).items()
                if k.split(".")[0] == migrations.app_label()
            )
            change_source = changes.AutoChanges(
                migrations = migrations,
                old_defs = old_defs,
                old_orm = last_migration.orm(),
                new_defs = new_defs,
            )

            # Get the actions, and then insert them into the actions lists
            forwards_actions = []
            backwards_actions = []
            if change_source:
                for action_name, params in change_source.get_changes():
                    # Run the correct Action class
                    try:
                        action_class = getattr(actions, action_name)
                    except AttributeError:
                        raise ValueError("Invalid action name from source: %s" % action_name)
                    else:
                        action_class.deal_with_not_null_no_default = empty
                        action = action_class(**params)
                        action.add_forwards(forwards_actions)
                        action.add_backwards(backwards_actions)
                        print(action.console_line(), file=sys.stderr)