gistfile1.py

def _get_model(self):
    DynamicClass = cache.get('DynamicModel_' + self.table_name)
    if DynamicClass is None:    
        # get the custom columns required for this table..
        attrs = dict((c.column_name, models.CharField(max_length=100, blank=True, null=True)) for c in self.custom_fields.all())
       
        class Meta:
           db_table = self.table_name
           app_label = self._meta.app_label
           managed = False
           unique_together = (('chain_id', 'chain_n', 'group_id'),)
       
        attrs['Meta'] = Meta
        attrs['__module__'] = ThisApp.__module__
   
       # create then cache it
       DynamicClass = type(str(self.table_name), (CallbackRecord,), attrs)
       cache.set('DynamicModel_' + self.table_name, DynamicClass, 60*20)
   
    return DynamicClass