class Avg(expression, output_field=FloatField(), **extra) [source] Returns the mean value

Options.default_permissions Defaults to ('add', 'change', 'delete'). You may customize this list, for example,

class When(condition=None, then=None, **lookups) [source] A When() object is

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

template A class attribute, as a format string, that describes the SQL that is generated for this function. Defaults to

set_source_expressions(expressions) Takes a list of expressions and stores them such that get_source_expressions()

Field.null If True, Django will store empty values as NULL in the database. Default is False

ImageField.height_field Name of a model field which will be auto-populated with the height of the image each time the model

ForeignKey.swappable Controls the migration framework’s reaction if this ForeignKey is pointing at a swappable

SET_NULL [source] Set the ForeignKey null; this is only possible if null