二十八、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。

 qusetion.html

{% extends'index.html' %}
{% block questiontitle %}提问页面{% endblock %}


{% block questionhead %}
    <link rel="stylesheet" type="text/css" href="../static/css/myweb.css"/>
  <script src="../static/js/question.js"></script>
{% endblock %}

{% block questiontbody %}
<form action="{{ url_for('question') }}" method="post">
    <div class="form-group">
        <!--<label for="name">选择列表</label>-->
        <!--<select class="form-control">-->
            <!--<option>1</option>-->
            <!--<option>2</option>-->
            <!--<option>3</option>-->
            <!--<option>4</option>-->
            <!--<option>5</option>-->
        <!--</select>-->

        <label for="questionTitle">标题</label>
        <textarea class="form-control" rows="1" id="questionTitle"></textarea>
        <label for="questionDatail">详情</label>
        <textarea class="form-control" rows="5" id="questionDatail"></textarea>
        <input type="checkbox" name="c1" id="c1" value="">记住我
        <br>
        <div id=""><br></div>
        <button  class="btn btn-default" style="color:black" type="submit" onclick="return fnQuestion()">发布</button>
    </div>
</form>
{% endblock %}

question.js

function fnQuestion() {
    var title =document.getElementById("title")
    var detail = document.getElementById("detail")
    var creat_time=document.getElementById("creat_time")
    var author_id =document.getElementById("author_id")
    var author=document.getElementById("author")
    var isError = true;
     if (title.value.length > 100 || oUpass.value.length < 0) {
        oError.innerHTML = "问题请输入100位以内字符"
        isError = false;
    }
        return isError;
    return isError;
}

mis.py

from flask import Flask, render_template,redirect,url_for,request,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)
    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 index():
    return render_template('index.html')


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


@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('/regist/',methods=['GET','POST'])
def regist():
    if request.method == 'GET':
        return render_template("regist.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) #数据库，添加操作
            db.session.commit()
            return redirect(url_for('login'))

#发布前需要登录，定义装饰器
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
def question():
    if request.methof=='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.ass(question)
        db.session.commit()
    return redirect(url_for('index'))



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

运行结果如下：