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。

 

py代码

from flask import Flask, render_template, request, redirect, url_for, 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)
    Telphone = db.Column(db.String(20), nullable=True)


class Question(db.Model):
    __tablename__ = 'question'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    author_id = db.Column(db.Integer,db.ForeignKey('user.id'))
    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 = db.relationship('User', backref=db.backref('question'))
# db.create_all()




# db.create_all()
@app.route('/')
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')
        passn = request.form.get('Password')
        user = User.query.filter(User.Username == usern).first()
        if user:
            if user.Password == passn:
                session['user'] = usern
                return redirect(url_for('index'))
            else:
                return '密码错误'
                # return window.alert("密码错误")
        else:
            # return window.alert("用户名不存在")
            return '用户名不存在'


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


def login_re(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('/logout/')
def logout():
    session.clear()
    return redirect(url_for("index"))


@app.route('/register/', methods=['GET', 'POST'])
def register():
    if request.method == 'GET':
        return render_template('register.html')
    else:
        usern = request.form.get('Username')
        passn = request.form.get('Password')
        teln = request.form.get('Telphone')
        user = User.query.filter(User.Username == usern).first()
        if user:
            return '用户名已经存在'
        else:
            user1 = User(Username=usern, Password=passn, Telphone=teln)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('login'))


@app.route('/question/', methods=['GET', 'POST'])
@login_re
def question():
    if request.method == 'GET':
        return render_template('question.html')
    else:
        an = User.query.filter(User.Username == session.get('user')).first().id
        tn= request.form.get('title')
        dn = request.form.get('detail')
        question1 = Question(author_id=an,title=tn, detail=dn)
        # question.author=User
        db.session.add(question1)  # 数据库，添加操作
        db.session.commit() #提交
    return redirect(url_for('index'))



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

 

question.html

{% extends 'base.html' %}
{% block title %}发布问答{% endblock %}
{% block head %}
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='css/question.css') }}">
{% endblock %}
{% block main %}
    <div class="fa">
    <h1>发布问答</h1>
        <form action="{{ url_for('question') }}" method="post">
        <div class="zhuti">
            <label for="question">问题</label><br>
            <input id="question" type="text" name="title"></div><br>
            <div class="fa-question">
            <label for="questionDetial">详情</label><br>
             <textarea  id="questionDetial" rows="12" name="detail"></textarea></div>
             <div class="check"><input type="checkbox">check me out</div>
             <button class="sumbit" type="submit">提交</button>
        </form>
    </div>
{% endblock %}