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
import config
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(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)
    create_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()

#查
#user = User.query.filter(User.username == 'sk').first()
#print(user.id,user.password)

#改
#user = User.query.filter(User.username == 'mis1234').first()
#user.password='888888'
#user.username='sk'
#db.session.commit()
#print(user.id,user.password)

#删
#user = User.query.filter(User.username=='sk').first()
#db.session.delete(user)
#db.session.commit()


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

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

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


@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 'username existed.'
        else:
            user1 = User(username = usern,password = passw,nickname = nickn)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('login'))

@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 'password error.'
        else:
            return 'username is not existed.'

@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'))

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:
        titleq = request.form.get('title')
        detailq = request.form.get('detail')
        author_id = User.query.filter(User.username==session.get('user')).first().id
        question1 = Question(title=titleq,detail=detailq,author_id=author_id)
        #question.author=user
        db.session.add(question1) #保存到数据库
        db.session.commit()
        return redirect(url_for('index'))


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

{% extends'base.html' %}

{% block title %}
问答
{% endblock %}
{% block head %}
    <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='css/question.css') }}">
{% endblock %}
{% block main %}
    <div class="form-group">

    <div class="box">
        <form action="{{ url_for('question') }}" method="post">
        <h1>发布问答</h1>
        <div class="input_box">
            <label for="questionQuestion">问题</label>
            <textarea class="form-control" rows="1" id="questionQuestion" name="title"></textarea></div>
        <div class="input_box">
            <label for="questionDetail">详情</label>
            <textarea class="form-control" rows="5" id="questionDetail" name="detail"></textarea></div>

            <div id="error_box"><br></div>
        <div class="input_box">
        <button onclick="fnQuestion()">提交问题</button>
        </div>
            </form>
        </div>

    </div>
{% endblock %}