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
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(50))

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 base():
    return render_template('base.html')

@app.route('/shouye/')
def shouye():
    return render_template('shouye.html') #跳转首页


@app.route('/denglu/',methods=['GET','POST'])
def gg():
    if request.method == 'GET':
        return render_template('denglu.html') #跳转登录
    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
                session.parmanent = True
                return redirect(url_for('shouye'))
            else:
                return u'password error'
        else:
            return u'username is not existed'

@app.route('/zhuche/', methods=['GET','POST'])
def login ():
    if request.method =='GET':
        return render_template('zhuche.html')#跳转注册
    else:
        usern = request.form.get('username')
        passw = request.form.get('password')
        nickn = request.form.get('nickname')
        user = User.query.filter(User.username == usern).first()
        if user:
            return u'username existed'
        else:
            user1 = User(username = usern,password = passw,nickname = nickn)
            db.session.add(user1)#数据库操作
            db.session.commit()
            return redirect(url_for('gg'))

@app.route('/tupian/')
def hh():
    return render_template('tupian.html') #跳转图片库


def loginFirst(func):
    @wraps(func)
    def wrapper (*args,**kwargs):
        if session.get('user'):
            return  func(*args,**kwargs)
        else:
            return redirect(url_for('gg'))
    return wrapper

@app.route('/fabu/',methods=['GET','POST'])
@loginFirst
def fabu():
    if request.method == 'GET':
        return render_template('fabu.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)
        db.session.commit()
    return redirect(url_for('shouye')) # 跳转发布


@app.context_processor
def context():
    usern = session.get('user')
    if usern:
        return {'username': usern }
    else:
        return {}



@app.route('/logout/')
def logout():
    session.clear()
    return redirect(url_for('shouye'))
if __name__ == '__main__':
    app.run(debug=True)

 

{% extends 'base.html' %}
{% block fabutitle %}发布{% endblock %}

{% block fabuhead %}
   <link href="{{ url_for('static',filename='fabu.css') }}" rel="stylesheet" type="text/css">

{% endblock %}
{% block fabubody %}

    <div class="box">
        <h2 >发布问答</h2>
        <form action="{{ url_for('fabu') }}" method="post">
        <div class="input_box">
            <label for="question">标题</label>
            <textarea  cols="40" rows="1" placeholder="请输入标题" name="title"></textarea>
        </div>
        <div class="input_box">
            <label for="questionDetail">内容</label>
            <textarea class="form-control" cols="50" rows="5" placeholder="请输入内容" name="detail"></textarea>
        </div>
        <br>
        <div class="input_box">
            <button onclick="fnQuestion">发布问答</button>
        </div>
        </form>
    </div>




{% endblock %}

 

 

 

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