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,redirect,request,url_for,session
from flask import render_template
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'))
    anthor=db.relationship('User',backref=db.backref('question'))
# db.create_all()
#查询
# user=User.query.filter(User.username=='mis1234').first()
# print(user.id,user.username,user.password)

#增加
# user=User(username='mis1234',password='111111',nickname='l')
# db.session.add(user)
# db.session.commit()

#增加
# user=User(username='luk',password='123456',nickname='lu')
# db.session.add(user)
# db.session.commit()
# 修改
# user=User.query.filter(User.username=='mis1234').first()
# user.password='12345678'
# db.session.commit()
#
# # 删除
# user=User.query.filter(User.username=='mis1234').first()
# db.session.delete(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('login.html')
    else:
        usern = request.form.get('username')
        passw = request.form.get('password')
        user = User.query.filter(User.username == usern).first()
        if user:
            if user.password==passw:
                session['user']=usern
                return redirect(url_for('shouye'))
            else:
                 return '密码错误。'
        else:
            return  '用户名不存在。'

@app.route('/register/',methods=['GET','POST'])
def register():
    if request.method=='GET':
        return render_template('register.html')
    else:
        usern=request.form.get('username')
        nickn = request.form.get('nickname')
        passw = request.form.get('password')
        user=User.query.filter(User.username==usern).first()
        if user:
            return '用户名已存在。'
        else:
            user1=User(username=usern,password=passw,nickname=nickn)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('login'))#重定回向登录页面


@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('shouye'))

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.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)
        # question.anthor=user
        db.session.add(question)
        db.session.commit()
    return redirect(url_for('shouye'))
# def question():
#     return render_template('question.html')

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

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

{% extends 'base.html'%}
{% block title %}
发布问题
{% endblock %}
{% block head %}
    <link href="{{url_for('static',filename='css/question.css') }}" rel="stylesheet" type="text/css">
{% endblock %}
{% block main %}
    <form class="header" action="{{url_for('question')}}" method="post">
    <h3 class="title">发布问答</h3>
    <div class="form-group">
             <label for="questiontitle">标题:</label><br>
        <textarea class="form-control" rows="2" id="questiontitle" name="title"></textarea>
       </div>
    <div class="form-group">
        <label for="questiondetail">详情:</label><br>
        <textarea class="form-control" rows="8" id="questiondetail" name="detail"></textarea>
    </div>
　　<div class="checkbox"></div>
    <button type="submit" class="btn">发布</button>
    </form>
{% endblock %}