Options.required_db_vendor New in Django 1.9. Name

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

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

class RawSQL(sql, params, output_field=None) [source] Sometimes database expressions can’t

class URLField(max_length=200, **options) [source] A CharField for a URL.

class ForeignKey(othermodel, on_delete, **options) [source] A many-to-one relationship. Requires

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

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

to_python(value) [source] Converts the value into the correct Python object. It acts as the

lhs The left-hand side - what is being transformed. It must follow the Query Expression API