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。

{% extends 'basic.html' %}
{% block title %}登录{% endblock %}

{% block head %}
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='../staticcss/20.css') }}">
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='../staticcss/200.css') }}">
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='../static/css/2000.css') }}">
    <script src="{{url_for('static',filename='js/39.js') }}" type="text/css"></script>
{% endblock %}


{% block question %}<div class="question">
<form align="center"  action="{{ url_for('question') }}" method="POST" >
    <h3 style="margin:0" align="center" >发布问答</h3>
    <form class="box"style="margin:0" align="center" >
        <div class="form-group"style="margin:0" align="center" >
            <label for="ask">问题</label>
            <br>
            <textarea class="form-control" rows="1" id="ask" name="title"></textarea>
        </div>
        <br>
        <div class="form-group">
            <label for="questionDetail">详细内容</label>
            <br>
            <textarea class="form-control" rows="10" id="questionDetail" style="margin:0" align="center" name="detail"></textarea>
        </div>
        <div class="checkbox"></div>
        <button type="submit" class="fabu">发布</button>
        <button type="submit" class="fabu">返回</button>
     </div>
    </form>
{% endblock %}

from flask_sqlalchemy import SQLAlchemy
import config
from flask import Flask,render_template,request,redirect, url_for,session
from functools import wraps
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 index():
    return render_template('index.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
                session.permanent = True
                return redirect(url_for('index'))
            else:
                return u'password error'
        else:
            return u'password is not existed'

@app.route('/rege/',methods=['GET','POST'])
def rege():
    if request.method =='GET':
        return render_template('rege.html')
    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 'username.existed.'
        else:
            user1 = User(username=usern,password=passw,nickname = nickn)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('login'))

def loginFrist(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'])
@loginFrist
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)
        db.session.commit()
        return redirect(url_for('index'))

@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'))


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