完成評論功能

from flask import Flask,render_template,request,redirect,url_for,sessionfrom flask_sqlalchemy import SQLAlchemyfrom functools import wrapsfrom datetime import datetimeimport config,osapp=Flask(__name__)app.config.from_object(config)db=SQLAlchemy(app)class User(db.Model):    __tablename__='user'    id=db.Column(db.Integer,primary_key=TabError,autoincrement=True)    username=db.Column(db.String(20),nullable=False)    password=db.Column(db.String(20),nullable=False)    nickname = db.Column(db.String(20), nullable=True)@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)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'))    question_id = db.Column(db.Integer,db.ForeignKey('question.id'))    creat_time = db.Column(db.DateTime,default=datetime.now)    detail = db.Column(db.Text,nullable=False)    question = db.relationship('Question',backref = db.backref('comments'))    author = db.relationship('User',backref = db.backref('comments'))class Question(db.Model):    __tablename__='wenda'    id=db.Column(db.Integer,primary_key=TabError,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('wenda'))# db.create_all()    #是否連接成功# 數據添加user=User(username='ma',password='gg')db.session.add(user)db.session.commit()# 數據查找user = User.query.filter(User.username=='hh').first()user.password='gg'db.session.commit()# 數據查詢user = User.query.filter(User.username=='ma').first()print(user.username,user.password)# 數據刪除user = User.query.filter(User.username=='ma').first()db.session.delete(user)db.session.commit()# session會話鏈接# filter()過濾器# route制定路徑和函數之間的關係# def定義一個變量@app.route('/')def switch():    return render_template('switch.html')def index():    context = {        'question': Question.query.order_by('-creat_time').all()    }    return render_template('index.html',**context)@app.route('/detail/<question_id>')def detail(question_id):   return render_template('detail.html',ques = question_id)@app.route('/login/',methods=['GET','POST'])# 跳轉登錄,methods定義它有兩種請求方式def login():    if request.method == 'GET':      return render_template('login.html')    else:        username = request.form.get('user')        password = request.form.get('psw')        user = User.query.filter(User.username == username).first()  # 判斷用戶名是否存在        if user:            if user.password==password:                session['user'] = username                session.permanent = True                return   redirect(url_for('switch'))            else:                return u'密碼錯誤'        else:            return u'用戶名不存在'@app.context_processordef mycontext():    username=session.get('user')    if username:        return {'username':username}    else:        return{}@app.route('/logout')def logout():    session.clear()    return  redirect(url_for('switch'))@app.route('/register/',methods=['GET','POST'])# 跳轉註冊,methods定義它有兩種請求方式def register():    if request.method == 'GET':        return render_template('register.html')    else:        username = request.form.get('user')        password = request.form.get('psw')        nickname = request.form.get('nickname')        user = User.query.filter(User.username == username).first() # 判斷用戶名是否存在        if user:            return u'該用戶已存在'        else:            user = User(username=username,password=password,nickname=nickname)            db.session.add(user)            db.session.commit()            return redirect(url_for('login'))# 進入問答界面先登陸功能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('/wenda/',methods=['GET','POST'])@loginFirstdef wenda():    if request.method=='GET':        return render_template('wenda.html')    else:        title=request.form.get('title')        detail=request.form.get('detail')        user = User.query.filter(user.username == session.get('user')).first()        author_id = user.id        question = Question(title=title, detail=detail, author_id=author_id)        wenda = Question(title=title,detail=detail,author_id=author_id)        db.session.add(wenda)        db.session.commit()        return redirect(url_for('switch'))@app.route('/detail/<question_id>',methods=['get''post'])def detail(question_id):    quest = Question.query.filter(Question.id ==question_id).first()    return render_template('detail.html', ques=quest)@app.route('/comment/',methods=['post'])@login_redef comment():    comment = request.form.get('new_comment')    ques_id = request.form.get('question_id')    auth_id = User.query.filter(user.username == session.get('user')).first().id    conn = Comment(author_id=auth_id, question_id=ques_id, detail_id=comment)    db.session.add(conn)    de.session.commit()    return redirect(url_for('detail', question_id=ques_id))if __name__ == '__main__':    app.run(debug=True)