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

@app.route('/comment/', methods=['POST'])
@log
def comment():
    comment = request.form.get("new_comment")
    question_id = request.form.get("question_id")
    author_id = User.query.filter(User.username == session.get('user')).first().id
    comm = Comment(author_id=author_id,question_id=question_id,detail=comment)
    db.session.add(comm)
    db.session.commit()
    context = {
        'comments': Comment.query.order_by('creat_time').all()
    }
    question = Question.query.filter(Question.id == question_id).first()
    return render_template('detail.html', ques=question, **context)

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

<input name="question_id" type="hidden" value="{{ ques.id }}"/>

3.显示评论次数

<h4>评论:（{{ ques.comments|length }}）</h4>

4.要求评论前登录

@log

5.尝试实现详情页面下的评论列表显示

<ul class="list-group">
            {% for b in comments %}
                <li class="list-group-item" >
                    <a href="#">{{ b.author.username }}</a> <span class="badge">{{ b.creat_time }}</span>
                    <p class="abstract">{{ b.detail }}</p>
                </li>
            {% endfor %}
        </ul>