Function unique_username

examples/sqlalchemy_example/demo/validation.py:12–17

(value, context: SqlalchemyContext)

@hug.type(extend=hug.types.text, chain=True, accept_context=True)
def unique_username(value, context: SqlalchemyContext):
    if context.db.query(
        context.db.query(TestUser).filter(TestUser.username == value).exists()
    ).scalar():
        raise ValueError("User with a username {0} already exists.".format(value))
    return value


class CreateUserSchema(Schema):