Options.managed Defaults to True, meaning Django will create the appropriate database tables in migrate

class Substr(expression, pos, length=None, **extra) [source] Returns a substring of length

class Lower(expression, **extra) [source] Accepts a single text field or expression and returns

Field.one_to_one Boolean flag that is True if the field has a one-to-one relation, such as a OneToOneField;

Field.unique If True, this field must be unique throughout the table. This is enforced

FieldFile.open(mode='rb') [source] Opens or reopens the file associated with this instance

ForeignKey.to_field The field on the related object that the relation is to. By default, Django uses the primary key of the

add(*objs, bulk=True) Adds the specified model objects to the related object set. Example:

Field.validators A list of validators to run for this field. See the validators documentation for more

exists() Returns True if the QuerySet contains any results, and False if not. This tries