def get_user(cls, username):
"""Get User instance for username
Args:
username: string with username
Returns:
instance of User class for given username or None
"""
return User.query(User.username == username).get()
def get_friends(self, limit=10, offset=0):
"""Gets friends for current User object
Returns:
A list of User objects who are current in current User's friends list or
None if User's friends list is empty
"""
if bool(self.friends):
f = memcache.get('friends', namespace=self.username)
if not f:
f = User.query(User.username.IN(self.friends)).order(-User.username)\
.fetch(limit, offset=offset)
memcache.set('friends', f, namespace=self.username, time=1440)
return f
return None
