发布功能完成

• 编写要求登录的装饰器

from functools import wraps

def loginFirst(func): #参数是函数

@wraps(func)

      def wrapper(*args, ** kwargs): #定义个函数将其返回

          #要求登录

          return func(*args, ** kwargs)

      return wrapper #返回一个函数

• 应用装饰器，要求在发布前进行登录，登录后可发布。

@app.route('/question/',methods=['GET','POST'])
@loginFirst
def question():

 

• 建立发布内容的对象关系映射。

class Question(db.Model):

• 完成发布函数。

保存到数据库。

重定向到首页。

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):
    __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), nullable=True)

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()

@app.route('/')
def shouye():
    return render_template('shouye.html')

@app.route('/zhuce/',methods=['GET','POST'])
def zhuce():
    if request.method=='GET':
        return render_template('zhuce.html')
    else:
        usern=request.form.get('username')
        passw=request.form.get('password')
        user=User.query.filter(User.username==usern).first()
        if user:
            return u'用户已存在'
        else:
            user1=User(username=usern,password=passw)
            db.session.add(user1)
            db.session.commit()
            return  redirect(url_for('denglu'))

@app.route('/denglu/',methods=['GET','POST'])
def denglu():
    if request.method=='GET':
        return render_template('denglu.html')
    else:
        usern=request.form.get('username')
        passw=request.form.get('password')
        user=User.query.filter(User.username==usern).first()
        if user:
            if user.password==passw:
                session['user']=usern
                return redirect(url_for('shouye'))
            else:
                return u'密码错误！'
        else:
            return u'用户不存在！'

@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('shouye'))

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

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

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

问答html

{% extends'shouye.html' %}

{% block title %}
问答平台
{% endblock %}

{% block jiemian %}
<div  id="container" style="width:500px;margin: 0 auto " >
    <form action="{{ url_for('wenda') }}" method="post">
        <div id="header" style="background-color:lightblue;height: 40px"><h2 align="center" style="margin-bottom:0;font-size: 33px;font-family: 楷体" >问答平台</h2></div>
        <div id="content" style="background-color:#EEEEEE;height: 280px;width:500px;float:left;text-align:center;font-size: 22px">
            <label for="aa">标题</label><br>
           <textarea  style="width: 400px" id="aa" name="title"></textarea><br>
            <label for="bb">详情</label><br>
           <textarea  style="width: 400px"  id="bb"rows="9" name="detail"></textarea><br>
            <input  type="submit" value="提交"style="width:65px;height:25px;font-size:15px">
        </div>
        <div id="footer" style="background-color:lightblue;clear:both;text-align:center;height: 40px;font-size: 31px;font-family: 楷体">版权*GZCC</div>
    </form>
</div>
{% endblock %}