def register(cls, name, pw, email=None):
'''
takes all user information, makes a pw hash, then
creates a new user instance with the hashed pw
'''
pw_hash = make_pw_hash(name, pw)
return User(parent=users_key(),
username=name,
pw_hash=pw_hash,
email=email)
def by_id(cls, uid):
'''
retrieves a user instance from the db using the
cookie's user-id value
'''
return User.get_by_id(uid, parent=users_key())
