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
import config
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)
    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 myweb():
    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
                session.permannet = True
                return redirect(url_for('index'))
            else:
                return '密码错误'
        else:
            return '用户名不存在'


@app.context_processor
def mycontext():
    usern = session.get('user')
    if usern:
        return {'username':usern}
    else:
        return {}
@app.route('/logout')
def logout():
    session.clear()
    return redirect(url_for('index'))

@app.route('/signin/', methods=['GET', 'POST'])
def regist():
    if request.method == 'GET':
        return render_template("signin.html")
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        nickname = request.form.get('nickname')
        user = User.query.filter(User.username == username).first()
        if user:
            return ' 用户名已存在'
        else:
            user = User(username=username, password=password, nickname=nickname)
            db.session.add(user)  # 数据库，添加操作
            db.session.commit()
            return redirect(url_for('login'))

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('/question/',methods=['GET','POST'])
@login_re
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)  # 数据库，添加操作
        db.session.commit()
    return redirect(url_for('index'))


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

{% extends'myweb.html' %}
{% block questiontitle %}提问页面{% endblock %}
{% block questionhead %}
    <link rel="stylesheet" type="text/css" href="../static/css/index.css"/>
  <script src="../static/js/question.js"></script>
{% endblock %}
{% block questiontbody %}
<form action="{{ url_for('question') }}" method="post">
    <div class="form-group">
        <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>
        <div id="error_box"><br></div>
            <div class="input-area">
                <input type="submit" value="立即发布">
            </div>
    </div>
</form>
{% endblock %}