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

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

db = SQLAlchemy(app)

#登录的数据库
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))
db.create_all()


#问题页的数据库
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()









# user=User(username='mis1',password='11111')
# db.session.add(user)
# db.session.commit()




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

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

@app.route('/login/',methods=['GET','POST'])
def login():
    if request.method == 'GET':
        return render_template('login.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
                session.permanent = True
                return redirect(url_for('base'))
            else:
                return u'password error'
        else:
            return u'password is not existed'



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


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#发布前登录，python装饰器
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.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'))


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

{% extends 'base.html' %}

{% block title %}问答{% endblock %}

{% block head %}
    <link href="{{ url_for('static',filename='css/login.css') }}" rel="stylesheet" type="text/css">
{% endblock %}

{% block main %}
       <br>

<section class="container">
    <div class="login">
<h1>Questions and answers</h1>
        <label for="ask">Question</label>
         <form action="{{ url_for('question') }}" method="post">
        <br>
        <textarea style="width:230px" type="password" rows="1" id="ask"  name="title"></textarea>

    <br>
    <div>
        <label for="questionDetail">Detail</label>
        <br>
        <textarea  rows="8" style="width:230px"id="questionDetail" type="password" name="detail"></textarea>
    </div>
    <br>
    <input type="checkbox">check me

    <input  type="submit" name="commit" value="发布">
         </form>
 </div>
           </section>

{% endblock %}