Field.blank If True, the field is allowed to be blank. Default is False. Note

Model.get_deferred_fields() [source] A helper method that returns a set containing the attribute

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

output_field Defines the type of class returned by the get_lookup() method. It must be a

Model.get_absolute_url() Define a get_absolute_url() method to tell Django how to calculate the canonical URL for

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

FieldFile.close() [source] Behaves like the standard Python file.close() method

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

bulk_create(objs, batch_size=None) This method inserts the provided list of objects into the database in an efficient manner

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