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,url_for,redirect,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))
# db.create_all()

class Question(db.Model):
    # 建立发布内容的对象关系映射
    __tablename__='wenda'
    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('wenda'))
db.create_all()

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

@app.route('/login/', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template("dl.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:
                return redirect(url_for('hh'))
            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('hh'))
# return render_template("homepage.html")
@app.route('/regist/',methods=['GET','POST'])
def regist():
    if request.method=='GET':
        return render_template("zc.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('login'))

#行动前需要登录，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

# 应用装饰器，要求在发布前进行登录，登录后可发布
@app.route('/wenda/',methods=['GET','POST'])
@loginFirst
def wenda():
    if request.method == 'GET':
        return render_template("wenda.html")
    else:
            title=request.form.get('title')
            detail=request.form.get('detail')
            author_id=User.query.filter(User.username==session.get('user')).first().id
            wenda = Question(title=title, detail=detail, author_id=author_id)
            db.session.add(wenda)  # 数据库，添加操作
            db.session.commit()
    return redirect(url_for('hh'))



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

{% extends 'base.html' %}

{% block title %}问答{% endblock %}
{% block head %}
    <link type="text/css" rel="stylesheet" href="{{ url_for('static',filename='css/hh.css') }}">
    <script src="{{ url_for('static',filename='js/wenda.js') }}"></script>
{% endblock %}

{% block main %}
    <br><br>
    <form action="{{ url_for('question') }}" method="post">
   <div class="label">
    <h1 style="color:red",align="center"> 发布问答</h1>
        <div class="q">
            <label for="question">问题</label>
            <textarea id="question" cols="50" rows="1" name='title'></textarea>
        </div>
        <div class="form-group">
            <label for="questionDetail">详情</label>
            <textarea class="form-control" id="questionDetail" cols="50" rows="5" name='detail'></textarea>
        </div>
       <br>
        <div class="input-area">
            <button onclick="fnQuestion">发布问答</button>
        </div>
    </div>
    </form>
{% endblock %}