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
from datetime import datetime
import config
from functools import wraps

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)

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 base():
    return render_template("base.html")

@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('/denglu/', methods=['GET', 'POST'])
def denglu():
    if request.method == 'GET':
        return render_template("denglu.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('base'))
            else:
                return '密码错误'
        else:
            return '用户名不存在'

@app.route('/zhuce/', methods=['GET', 'POST'])
def zhuce():
    if request.method == 'GET':
        return render_template("zhuce.html")
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user:
            return '用户名已存在'
        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('denglu'))

def log(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('/question/',methods=['GET','POST'])
@log
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
        user = User.query.filter(User.username == session.get('user')).first()
        question=Question(title=title,detail=detail,author_id=author_id)
        question.author = user
        db.session.add(question)#保存到数据库
        db.session.commit()#提交
        return redirect(url_for('base'))




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

{% extends 'base.html' %}

{% block title %}问答{% endblock %}
{% block head %}
     <meta charset="UTF-8">
    <link type="text/css" rel="stylesheet" href="../static/css/question.css">

{% endblock %}

{% block main %}
   <div class="label">

    <h1 style="color:lightseagreen",align="center"> 发布问答</h1>
       <form action="{{ url_for('question') }}" method="post">
        <div class="q">
            <label for="question">问题</label>
            <textarea name="title" textarea id="question" cols="50" rows="1"></textarea>
        </div>
        <div class="form-group">
            <label for="questionDetail">详情</label>
            <textarea name="detail" textarea class="form-control" id="questionDetail" cols="50" rows="5"></textarea>
        </div>
           <input type="checkbox">check me out
       <br>
        <div class="input-area">
            <button type="submit" class="btn btn-default">发布问答</button>
        </div>
   </form></div>
{% endblock %}