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
from functools import wraps
import config
from datetime import datetimeapp = 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 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()
# user=User(username='mis1234',password='111111')
# db.session.add(user)
# db.session.commit()
@app.route('/')
def base():return render_template("base.html")@app.route('/login/', methods=['GET', 'POST'])
def login():if request.method == 'GET':return render_template("denglu.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']=usernamesession.permanent=Truereturn redirect(url_for('base'))else:return '密码错误'else:return '用户名不存在'@app.context_processor
def mycontext():usern = session.get('username')if usern:return {'username':usern}else:return {}@app.route('/regist/', methods=['GET', 'POST'])
def zhuce():if request.method == 'GET':return render_template("zhuce.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'))
@app.route('/logout/')
def logout():session.clear()return redirect(url_for('base'))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('/fabu/',methods=['GET','POST'])
@loginFirst
def fabu():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().idquestion=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('base'))def fabu():return  render_template('question.html')if __name__=='__main__':app.run(debug=True)

{% extends 'base.html' %}{% block title %}问答{% endblock %}
{% block head %}<meta charset="UTF-8"><link type="text/css" rel="stylesheet" href="../static/css/question.css">{% endblock %}{% block main %}<form action="{{ url_for('fabu') }}" method="post"><div class="label"><h1 style="color:pink",align="center"> 发布问答</h1><div class="q"><label for="question">问题</label><textarea id="question" cols="50" rows="1"></textarea></div><div class="form-group"><label for="questionDetail">详情</label><textarea class="form-control" id="questionDetail" cols="50" rows="5"></textarea><br><input type="checkbox" name="c1" id="c1" value="">记住我<br></div><br><div class="input-area"><button οnclick="fnQuestion">发布问答</button></div></div></form>
{% endblock %}