output_field Defines the class this transformation outputs. It must be a

class Aggregate(expression, output_field=None, **extra) [source]

FieldFile.size The result of the underlying

class TimeField(auto_now=False, auto_now_add=False, **options) [source] A time, represented

select_related(*fields) Returns a QuerySet that will “follow” foreign-key relationships, selecting additional related-object

ManyToManyField.db_constraint Controls whether or not constraints should be created in the database for the foreign keys in

get_or_create(defaults=None, **kwargs) A convenience method for looking up an object with the given kwargs (may

value_to_string(obj) [source] Converts obj to a string. Used to serialize the

get_lookup(lookup_name) Must return the lookup named lookup_name. For instance, by returning self.output_field

bilateral A boolean indicating whether this transformation should apply to both lhs and rhs. Bilateral