code: def get_field_names(self, declared_fields, info):
          
          meta_fields = getattr(self.Meta, 'meta_fields', [])
  
          declared = OrderedDict()
          for field_name in set(declared_fields.keys()):
              field = declared_fields[field_name]
              if field_name not in meta_fields:
                  declared[field_name] = field
          fields = super(ModelSerializer, self).get_field_names(declared, info)
          return list(fields) + list(getattr(self.Meta, 'meta_fields', list()))
docs: We override the parent to omit explicity defined meta fields (such
          as SerializerMethodFields) from the list of declared fields