完成评论功能

1. 定义评论的视图函数
   @app.route('/comment/',methods=['POST'])
   def comment()：
   读取前端页面数据，保存到数据库中
2. 用<input type="hidden" 方法获取前端的"question_id" 
3. 显示评论次数
4. 要求评论前登录
5. 尝试实现详情页面下的评论列表显示

1.定义评论的视图函数

代码如下：

#评论内容
@app.route('/comment/',methods=['POST'])
def comment():
    if request.method == 'POST':
        comment= request.form.get('detail')
        question_id = request.form.get('question_id')
        # author_id = request.form.get('author_id')
        author_id=User.query.filter(User.username==session.get('user')).first().id
        detail = request.form.get('detail')
        com = Comment(question_id=question_id, author_id=author_id, detail=detail)
        db.session.add(com)
        db.session.commit()
        return redirect(url_for('detail',question_id=question_id))

2.用<input type="hidden" 方法获取前端的"question_id" 

代码如下：

<div class="page-header">
    <h3>{{ ques.title }}<br><br>
    <small>作者：{{ ques.author.username }}&nbsp&nbsp&nbsp
    <span class="badge">{{ ques.creat_time }}</span>
        </small></h3>
</div>
            <p class="lead">{{ ques.detail }}</p>
            <hr>
            <form action="{{ url_for('comment') }}" method="post" style="">
                <div class="form-group">
                    <input type="text" value="{{ ques.id }}" name="question_id" hidden>
                    <input type="text" value="{{ user.id }}" name="author_id" hidden>
                    <textarea name="detail" class="form-control"  row="3" id="new-comment" placeholder="write your comment"></textarea>
                </div>
                <button type="submit" class="btn btn-default">发送</button>
            </form>
        <hr>
<h3>评论区:
    ({{ ques.comments|length }})
</h3><br>

3.显示评论次数

代码如下：

<h3>评论区:
    ({{ ques.comments|length }})
</h3><br>

运行结果：

4.要求评论前登录

代码如下：

#发布前登陆装饰器
def loginFirst(func):  # 参数是函数
    @wraps(func)
    def wrapper(*args, **kwargs):  # 定义个函数将其返回
        if session.get('user'):
            return func(*args, **kwargs)
        else:
            return redirect(url_for('login'))
    return wrapper  # 返回一个函数


#评论内容
@app.route('/comment/',methods=['POST'])
@loginFirst
def comment():
    if request.method == 'POST':
        comment= request.form.get('detail')
        question_id = request.form.get('question_id')
        # author_id = request.form.get('author_id')
        author_id=User.query.filter(User.username==session.get('user')).first().id
        detail = request.form.get('detail')
        com = Comment(question_id=question_id, author_id=author_id, detail=detail)
        db.session.add(com)
        db.session.commit()
        return redirect(url_for('detail',question_id=question_id))

运行结果：

 

5.尝试实现详情页面下的评论列表显示

代码如下：

 html

<h3>评论区:
    ({{ ques.comments|length }})
</h3><br>


<div class="basic_box" style="padding-bottom: 50px;">
    <ul class="list-group" style="margin-bottom: 10px">
      {% for qu in comments %}

            <li class="list-group-item" style=" 800px">


                <a class="wrap-img" href="#" target="_blank">
                    <img src="{{ qu.author.image }}" width="50px">
                </a>
                <span class="glyphicon glyphicon-left" aria-hidden="true"></span>

                <br>
                <a href="#">{{ qu.author.username }}</a>
                <span class="badge">评论时间:{{ qu.creat_time }}</span>
                <p style="">{{ qu.detail }}
                </p>


            </li>
     {% endfor %}
    </ul>

py

#进入每篇文章详情页
@app.route('/detail/<question_id>',methods=['GET','POST'])

def detail(question_id):
    quest=Question.query.filter(Question.id==question_id).first()

    context={
       'comments':Comment.query.filter(Comment.question_id==question_id).order_by('-creat_time').all()

    }
    return render_template('detail.html',**context,ques=quest)

运行结果：