friend = db.Table('follow',
    db.Column('user_id', db.Integer, db.ForeignKey('user.id')),
    db.Column('friend_id', db.Integer, db.ForeignKey('user.id')),
    db.Column('status', db.Boolean,default=False)
)


class User(db.Model, UserMixin):
    __tablename__ = 'user'
    id = db.Column(db.Integer(), primary_key=True)
    username = db.Column(db.String(255), unique=True)
    email = db.Column(db.String(255), unique=True)
    password = db.Column(db.String(255), nullable=False)
    friends = db.relationship('User',
        secondary = friend,
        primaryjoin = (friend.c.friend_id == id),
        secondaryjoin = (friend.c.user_id == id),
        backref = db.backref('follow'),
    lazy='dynamic')
    created =  db.Column(db.DateTime())

class User(db.Model, UserMixin):
    __tablename__ = 'user'
    id = db.Column(db.Integer(), primary_key=True)
    username = db.Column(db.String(255), unique=True)
    email = db.Column(db.String(255), unique=True)
    password = db.Column(db.String(255), nullable=False)
    friends = db.relationship('Friends', backref='user', lazy='dynamic')
    created =  db.Column(db.DateTime())

class Friends(db.Model):
    __tablename__ = 'friends'
    id = db.Column(db.Integer(), primary_key=True)
    user_id = db.Column(db.Integer()), db.ForeignKey('user.id'))
    friend_id = db.Column(db.Integer())
    status = db.Column(db.Boolean())