Method transform

django/db/models/sql/query.py:1961–1970

(field, alias, *, name, previous)

        for name in transforms:

            def transform(field, alias, *, name, previous):
                try:
                    wrapped = previous(field, alias)
                    return self.try_transform(wrapped, name)
                except FieldError:
                    # FieldError is raised if the transform doesn't exist.
                    if isinstance(final_field, Field) and last_field_exception:
                        raise last_field_exception
                    else:
                        raise

            final_transformer = functools.partial(
                transform, name=name, previous=final_transformer