小编aj3*_*409的帖子

如何实现用户对帖子点赞功能？我遵循了其他在线用户发布的代码；但是，我收到以下错误：

AmbiguousForeignKeysError: 
Could not determine join condition between parent/child tables on relationship 
User.posts - there are multiple foreign key paths linking the tables.  Specify 
the 'foreign_keys' argument, providing a list of those columns which should be 
counted as containing

class User(db.Model):
   id = db.Column(db.Integer, primary_key=True)
   username = db.Column(db.String(20), unique=True, nullable=False)
   email = db.Column(db.String(120), unique=True, nullable=False)
   image_file = db.Column(db.String(20), nullable=False, default='default.jpg')
   password = db.Column(db.String(60), nullable=False) 
   posts = db.relationship('Post', backref='author', lazy=True)

   def __repr__(self):
       return "{}, {}, {}".format(self.username, self.email, self.image_file)

   liked = db.relationship( …