docs: def apply(self, query, data):
          """Filter a query."""
          field = self.model_field or query.model_class._meta.fields.get(self.name)
          if not field or self.name not in data:
              return query
          value = self.value(data)
          if value is self.default:
              return query
          value = field.db_value(value)
          return self.filter_query(query, field, value)