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

py

from flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
import config
from datetime import datetime
from functools import wraps

app = Flask(__name__)
app.config.from_object(config)
db=SQLAlchemy(app)

class User(db.Model):
    __table__name = 'user'
    id = db.Column(db.Integer,primary_key=True,autoincrement=True)
    username = db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20),nullable=False)
    nickname = db.Column(db.String(50))

class Question(db.Model):
    __tablename__ = 'question'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    title = db.Column(db.String(100), nullable=False)
    detail = db.Column(db.Text, nullable=False)
    creat_time = db.Column(db.DateTime, default=datetime.now)
    author_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    author = db.relationship('User', backref=db.backref('question'))
#db.create_all()
class Comment(db.Model):
    __tablename__ = 'commment'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    author_id = db.Column(db.Integer, db.ForeignKey('User.id'))
    question_id=db.Column(db.Integer,db.ForeignKey('question.id'))
    detail=db.Column(db.Text,nullable=False)
    time = db.Column(db.DateTime, default=datetime.now)
    question=db.relationship('Question',backref=db.backref('comments'))
    author=db.relationship('User',backref=db.backref('comments'))

@app.route('/',methods=['GET','POST'])
def index():
    context={
        'question': Question.query.all()
    }
    return render_template('index.html',**context)

@app.route('/question/',methods=['GET','POST'])
@loginFirst
def question():
    if request.method == 'GET':
        return render_template('question.html')
    else:
        title = request.form.get('title')
        detail = request.form.get('detail')
        author_id = User.query.filter(User.username == session.get('user')).first().id
        question = Question(title=title, detail=detail, author_id=author_id)
        db.session.add(question)
        db.session.commit()
    return redirect(url_for('index'))

@app.route('/comment/',methods=['POST'])
def comment():
     comment = request.form.get('detail')
     ques_id = request.form.get('question_id')
     auth_id = User.query.filter(User.username == session.get('user')).first().id
     comm = Comment(author_id=auth_id,question_id=ques_id,detail=comment)
     db.session.add(comm)
     db.session.commit()
     return redirect(url_for('detail',question_id=ques_id))


@app.route('/detail/<question_id>')
def detail(question_id):
    quest = Question.query.filter(Question.id == question_id).first()
    return render_template('detail.html',ques=quest)

@app.route('/zhuce/',methods=['GET','POST'])
def zhuce():
    if request.method =='GET':
        return  render_template('zhuce.html')
    else:
        usern = request.form.get('name')
        teln = request.form.get('password')
        passw = request.form.get('password1')
        user = User.query.filter(User.username==usern).first()
        if user:
            return 'username existed'
        else:
            user= User(username=usern,tel=teln,password=passw)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for('login'))

@app.route('/login/', methods=['GET','POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user:
            if user.password ==password:
                session['user'] = username
                return redirect(url_for('index'))
            else:
                return u'password error'
        else:
            return u'username is not existed'

@app.route('/logout/')
def logout():
    session.clear()
    return redirect(url_for('index'))

def loginFirst(func):
    @wraps(func)
    def wrapper(*args,**kwargs):
        if session.get('user'):
            return func(*args,**kwargs)
        else:
            return redirect(url_for('login'))
    return  wrapper

@app.context_processor
def mycontext():
    usern = session.get('user')
    if usern:
        return{'username':usern}
    else:
        return {}

if __name__ == '__main__':
    app.run(debug=True)

 html

{% extends "base.html" %}
{% block title%}详细内容{% endblock %}

{% block main %}
<body bgcolor="#ffd700">
    <div class="GuFeng">
        {   <form action="{{ url_for('/detail/<question_id>') }}" method="post">}

      <h2>标题:{{ ques.title }}</h2><br>
      <h3>用户名：{{ ques.author.username }}</h3><br>
      <h3> 发布时间：{{ ques.create_time }}</h3>
      <p>内容：{{ ques.detail }}</p>
        <hr>
        <textarea class='comment'rows="10"id="detail"name="detail"></textarea>
        <br><input  type="submit" value="发布"style="width:100px;height:50px;font-size:50px">
        <input name="question_id" type="hidden" value="{{ ques.id }}"/>
        <p>评论：</p>
        <table border=5 style="background: gold"width="50">
            <tr><td>评论内容</td></tr>
            <tr><td>评论内容</td> </tr>
            <tr><td>评论内容</td></tr>
            </tr>
        </table>
    </div>
</body>
{% endblock %}