7-动态

就像weixin朋友圈那样，用户可以发布信息到动态，也可以拉取好友发布的信息，要实现该功能我们要新建一个表，既然是仿朋友圈，那就叫friend_circle吧

朋友圈表

class Friend_Circle(db.Model):
    __tablename__ = 'friend_circle'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    create_time = db.Column(db.DateTime, default=datetime.now)

    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))  # 发布者
    user = db.relationship('User', backref=db.backref('friend_circles'))

    text = db.Column(db.Text)
    address = db.Column(db.String(200))
    weather = db.Column(db.String(20))

发布动态的时候，除了发布纯文本，还有图片、视频等文件，并且拉取朋友圈的数据内，也需要包含点赞、评论等数据，所以在做朋友圈功能前还要实现文件上传、点赞评论等功能

文件表

class File(db.Model):
    __tablename__ = 'file'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    create_time = db.Column(db.DateTime, default=datetime.now)

    type = db.Column(db.String(50), nullable=False)
    name = db.Column(db.String(255), nullable=False)
    link = db.Column(db.String(255), nullable=False)

    uploader_id = db.Column(db.Integer, db.ForeignKey('user.id'))  # 上传者
    uploader = db.relationship('User', backref=db.backref('files'))

    source_id = db.Column(db.Integer)  # 对应表id
    source_type = db.Column(db.Integer)  # 对应枚举类型

点赞表

class Like(db.Model):
    __tablename__ = 'like'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    create_time = db.Column(db.DateTime, default=datetime.now)

    friend_circle_id = db.Column(db.Integer,db.ForeignKey('friend_circle.id'))
    friend_circle = db.relationship('Friend_Circle',backref=db.backref('likes'))

    user_id = db.Column(db.Integer,nullable=False)

评论表

class Comment(db.Model):
    __tablename__ = 'comment'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    create_time = db.Column(db.DateTime, default=datetime.now)

    friend_circle_id = db.Column(db.Integer,db.ForeignKey('friend_circle.id'))
    friend_circle = db.relationship('Friend_Circle',backref=db.backref('comments'))

    text = db.Column(db.Text,nullable=False)

    user_id = db.Column(db.Integer,nullable=False) # 发表评论者
    target_id = db.Column(db.Integer) # 对谁的评论，默认空

别忘了修改数据库表之后执行两条终端命令

python3 manage.py db migrate
python3 manage.py db upgrade

然后就是朋友圈数据拉取:

@app.route('/friend_circle/', methods=['GET', 'POST'])
@login_required
def friend_circle():
    if request.method == 'GET':
        user_id = session.get('user_id')

        friends = Friend_Bind.query.filter(or_(Friend_Bind.uid == user_id,
                                               Friend_Bind.fid == user_id)).all()

        friend_id_list = []
        friend_id_list.append(user_id)

        for friend in friends:
            uid = friend.uid
            if uid == user_id:
                uid = friend.fid

            friend_id_list.append(uid)

        circles = Friend_Circle.query.filter(Friend_Circle.user_id.in_(friend_id_list)).order_by(
            desc(Friend_Circle.create_time)).limit(100).all()

        result = []
        for circle in circles:
            user = User.query.filter(User.id == circle.user_id).first()

            content = {
                'circle_id': circle.id,
                'username': user.username,
                'head_img_url': user.head_img_url,
                'text': circle.text,
                'user_id': user.id,
                'timestamp': time.mktime(circle.create_time.timetuple()),
                'images': None,
                'like_status': '点赞'
            }
            result.append(content)
        context = {'result': result}
        return render_template('friend_circle.html', **context)
    else:
        return jsonify({'code': 1,
                        'result': 'null'})

点赞

@app.route('/like//')
def like(friend_circle_id):
    my_user_id = session.get('user_id')

    fc = Friend_Circle.query.filter(Friend_Circle.id == friend_circle_id).first()

    exist = Like.query.filter(Like.user_id == my_user_id,
                              Like.friend_circle_id == friend_circle_id).first()
    if exist is not None:
        db.session.delete(exist)
        db.session.commit()
        return u'取消点赞成功'

    like = Like(friend_circle=fc,
                friend_circle_id=fc.id,
                user_id=my_user_id)

    db.session.add(like)
    db.session.commit()

    return u'点赞成功'

评论

@app.route('/comment/', methods=['GET', 'POST'])
@login_required
def comment():
    user_id = session.get('user_id')

    text = request.form.get('text')
    circle_id = request.form.get('circle_id')

    fc = Friend_Circle.query.filter(Friend_Circle.id == circle_id).first()

    comment = Comment(friend_circle_id=circle_id,
                      user_id=user_id,
                      friend_circle=fc,
                      text=text)
    db.session.add(comment)
    db.session.commit()

    return u'评论成功'

这样就完成了。

GitHub链接