完成评论功能

最新推荐文章于 2025-12-27 19:25:02 发布

转载最新推荐文章于 2025-12-27 19:25:02 发布 · 96 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/kebibrany/p/8006971.html

文章标签：

#前端 #数据库 #python #ViewUI

本文详细介绍了使用Flask框架搭建应用的过程，包括用户注册、登录、提问及评论功能的实现。通过实例展示了如何利用SQLAlchemy进行数据库操作，如用户、问题和评论的数据模型创建，以及前后端交互实现评论的增删查改。

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
用<input type="hidden" 方法获取前端的"question_id"
显示评论次数
要求评论前登录

尝试实现详情页面下的评论列表显示

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

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


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

@app.route('/regist/',methods=['GET','POST'])
def regist():
    if request.method=='GET':
        return render_template('regist.html')
    else:
        username=request.form.get('username')
        password=request.form.get('password')
        nickname=request.form.get('nickname')
        user=User.query.filter(User.username==username).first()
        if user:
            return u'username existed'
        else:
            user=User (username=username,password=password,nickname=nickname)
            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.context_processor
def mycontext():
    usern=session.get('user')
    if usern:
        return{'username':usern}
    else:
        return{}

@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.route('/lable/',methods=['GET','POST'])
@loginFirst
def lable():
    if request.method == 'GET':
        return render_template('lable.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('/detail/<question_id>')
def detail(question_id):
    # context={
    #     'comments':Comment.query.all()
    # }
    quest = Question.query.filter(Question.id == question_id).first()
    return render_template('detail.html',ques=quest)

@app.route('/comment/', methods=['POST'])
@loginFirst
def comment():
        comment= request.form.get('commentdetail')
        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)
        # question.author=User
        db.session.add(comm)  # 数据库，添加操作
        db.session.commit() #提交
        return redirect(url_for('detail', question_id=ques_id))

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

{% extends 'base.html' %}
{% block title %}detail{% endblock %}
{% block head %}
    {#    <script src="{{ url_for('static',filename='js/base.js') }}" type="text/javascript"></script>#}
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='css/detailpage.css') }}">
{% endblock %}
{% block main %}
    <div align="center">
        <div class="a1">
{#             <h3>{{ ques.title }}<br><small>{{ ques.author.Username }}#}
{#                    <span class="badge">{{ ques.creat_time }}</span></small></h3></div>#}
{#                    <p class="lead">{{ ques.detail }}</p>#}
{#            <h3>#}
        <form action="{{ url_for('comment') }}" method="post">
{#            <h4>评论:({{ ques.comments }})</h4>#}

                    <h2>Beyond乐队</h2>
                    <p>Beyond</p>
               <p>1983年成立</p>
                   <p>detail</p>
            <br></div>
        <div class="a2">
            <div class="pinglun"><label for="comment">评论</label><br></div>
            <textarea id="comment" rows="12" name="commentdetail"></textarea></div>
        <input name="question_id" type="hidden" value="{{ ques.id }}"/>
        <button type="submit" class="fasong" >发送评论</button>
    <h4>comment:({{ ques.commemts|length }})</h4>
        </form>
    <ul class="list-group" style="margin-left:20%;margin-top: 5%;margin-right:20%">
        {% for foo in ques.comments %}
                <li class="list-group-item" >
                <a href="#">{{ foo.author.username }} </a><br>
                    <a href={{ url_for('detail',question_id=foo_id)}}>{{ foo.title }}</a>

                    <span class="badge">{{ foo.creat_time }}</span>
                    <p class="abstract">{{ foo.detail }}</p>
                </li>
        {% endfor %}
    </ul>
    </div>
{% endblock %}

转载于:https://www.cnblogs.com/kebibrany/p/8006971.html