二十九、制作首页的显示列表

1.在首页添加显示问答的列表，并定义好相应的样式。

无序列表

<ul >

  <li>Coffee</li>

  <li>Tea</li>

  <li>Milk</li>

</ul>

<ul class="list-group">
         <li class="list-group-item" >
               <a  class="author" href="">{{ user }}</a>
                   <br>
               <a class="title"  href="">标题</a><br>
                     <span >发布时间 </span>
                        <p class="abstract">文章内容 </p>
           </li>
 </ul>

2. 用字典向index.html传递参数。

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

import config

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


class User(db.Model):
    __tablename__ = '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(20))

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)
    create_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()


@app.route('/')
def index():
    #用字典向index.html传递参数
    context={
        'questions':'Why so lonely'
    }
    return render_template('index.html',**context)


@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('login'))
            else:
                return '密码错误'
        else:
            return '用户名不存在'


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

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


@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")
        user = User.query.filter(User.username == username).first()
        if user:
            return 'username existed.'
        else:
            user = User(username=username, password=password)
            db.session.add(user) #数据库，添加操作
            db.session.commit()
            return redirect(url_for('login'))

#发布前需要登录，定义装饰器
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('/question/',methods=['GET','POST'])
@loginFirst
def question():
    if request.methof=='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.ass(question)
        db.session.commit()
    return redirect(url_for('index'))



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




import os

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@127.0.0.1:3306/mis1201?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False

SECRET_KEY = os.urandom(24)