ForeignKey.limit_choices_to Sets a limit to the available choices for this field when this field is rendered using a ModelForm

pre_save(model_instance, add) [source] Method called prior to get_db_prep_save()

Field.unique_for_date Set this to the name of a DateField or DateTimeField to require that this field

rel_db_type(connection) [source] New in Django

function A class attribute describing the function that will be generated. Specifically, the function will be interpolated

GenericIPAddressField.protocol Limits valid inputs to the specified protocol. Accepted values are 'both' (default)

lookup_name The name of the lookup, used for identifying it on parsing query expressions. It cannot contain the string "__"

class Coalesce(*expressions, **extra) [source] Accepts a list of at least two field names

class ExtractWeekDay(expression, tzinfo=None, **extra) [source] lookup_name

class Sum(expression, output_field=None, **extra) [source] Computes the sum of all values