code: def to_python(self, value):
          
          if value is None or value == '':
              return {}
  
          if isinstance(value, six.string_types):
              res = loads(value)
          else:
              res = value
  
          if isinstance(res, dict):
              return JSONDict(**res)
          elif isinstance(res, list):
              return JSONList(res)
  
          return res
docs: Convert our string value to JSON after we load it from the DB