South & reversion

fix_reversions.py

from reversion.models import Version
import json

object_fields = {}

for v in Version.objects.all():

    # For now, only dealing with versions that correspond to a still-existing
    # model instance, since it's easier to get the model class with that info
    if v.object:

        v_data = json.loads(v.serialized_data)
        object_name = v.object._meta.object_name

        if not object_fields.has_key(object_name):
            fields = v.object._meta.get_all_field_names()
            object_fields[object_name] = fields

        approved_fields = object_fields[object_name]
        version_fields = v_data[0]['fields']
        bad_fields = [f for f in version_fields if f not in approved_fields]

        for field_to_remove in bad_fields:
            del(v_data[0]['fields'][field_to_remove])

        v.serialized_data = json.dumps(v_data)
        v.save()