发布功能完成。

Posted 2020-10-16 lyx1997

• 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。

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

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

#创建用户模型
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)
    question = db.Column(db.String(100), nullable=False)
    questionDetail = 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 first():
    return render_template(\'first.html\')

@app.route(\'/sign_up/\',methods=[\'GET\',\'POST\'])#登录
def sign_up():
    if request.method == "GET":
        return render_template("sign_up.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
                sessionpermanent = True
                return redirect(url_for(\'first\'))
            else:
                return \'password error\'
        else:
           return \'username is not existed\'


@app.route(\'/sign_in/\',methods=[\'GET\',\'POST\'])#注册
def sign_in():
    if request.method == "GET":
        return render_template("sign_in.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)
            db.session.commit()
            return redirect(url_for(\'first\'))

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

@app.route(\'/logout/\')
def logout():
    session.clear()
    return render_template("first.html")

def log(func): #参数是函数
    @wraps(func)
    def wrapper(*args, **kwargs): #定义个函数将其返回
        if session.get(\'user\'):
            return func(*args, **kwargs)
        else:
            return redirect(url_for(\'sign_up\'))
    return wrapper #返回一个函数

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


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

 

{% extends \'first.html\' %}
 {% block title %}
          讨论交流*
 {% endblock %}
{% block head %}
  <link type="text/css" rel="stylesheet" href="{{ url_for(\'static\',filename=\'css/question.css\') }}">
 
{% endblock %}
 
{% block main %}
   <div class="box1" >
    <form action="{{ url_for(\'question\') }}" method="post">
    <h3 > 发帖</h3>
        <div class="TT">
            <label for="question">标题：</label><br>
            <textarea id="question" name="question" cols="100" rows="1"></textarea><br>
            <label for="questionDetail">内容：</label><br>
            <textarea  id="questionDetail" name="questionDetail" cols="100" rows="10"></textarea>
        </div>
       <br>
        <div class="ja">
            <button  class="sent" onclick="fnchat">发布</button>
        </div>
    </div>
{% endblock %}