gistfile1.txt

def migrate_data(apps, schema_editor):
    Tracker = apps.get_model('campaign', 'Tracker')
    Syncer = apps.get_model('campaign', 'Syncer')
    Key = apps.get_model('attribute', 'Key')
    for k in Key.objects.all():
        c = k.parent_campaign
        if c.campaign_type == 'Panel':
            new_camp = Syncer.objects.get(cid=c.cid)
        else:
            new_camp = Tracker.objects.get(cid=c.cid)
        logger.debug('processing key %s for %s -> %s', k, c, new_camp)
        k.parent_campaign_new = new_camp  # Key.parent_campaign_new is GenericForeignKey
        k.save()