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))

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

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

def login_first(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"])
@login_first
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('first'))

@app.route("/login",methods=["GET","POST"])
def login():
    if request.method == "GET":
      return render_template("login.html")
    else:
        usern = request.form.get("usern")
        passw = request.form.get("userp")
        user = User.query.filter(User.username==usern).first()
        if user:
            if user.password == passw:
                session["user"] = usern
                # session.permanent = True
                return redirect(url_for("first"))
            else:
                return "密码错误，请重新输入！"
        else:
            return "用户名不存在！"


@app.route("/regist",methods=["GET","POST"])
def regist():
    if request.method == "GET":
        return render_template("regist.html")
    else:
        usern1 = request.form.get("newn")
        passw1 = request.form.get("newp")
        user = User.query.filter(User.username==usern1).first()
        if user:
            return "用户名已存在！"
        else:
            user = User(username = usern1,password = passw1)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for("login"))

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

@app.route('/clear')
def clear():
    session.clear()
    return redirect(url_for('first'))



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

{% extends 'base.html' %}
{% block title %}
问题发布
{% endblock %}
{% block head %}
    <link rel="stylesheet" href="{{ url_for('static',filename='css/vv.css')}}" type="text/css">
{% endblock %}

{% block main %}
    <form action="{{ url_for("question") }}" method="post">
    <div  id="container">
    <div id="header" ><h3 align="center" style="margin-bottom:0;font-size: 33px;font-family: 楷体" >问答平台</h3></div>
    <div id="content" >
        <label for="wen" >问答</label><br>
       <textarea  style="width: 400px" id="wen" name="title"></textarea><br>
        <label for="xiang" >详情</label><br>
       <textarea  style="width: 400px"  id="xiang"rows="10" name="detail"></textarea><br>
        <input  type="submit" value="提交"style="width:65px;height:25px;font-size:15px">
    </div>
</div>
    </form>>
{% endblock %}