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 datetime import datetime
from functools import wraps
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):
    __table__name = '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 'password error'
        else:
            return 'username is not existed.'

@app.route('/regist/',methods=['GET','POST'])
def regist():
    if request.method == 'GET':
        return render_template('regist.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('/logout')
def logout():
    session.clear()
    return redirect(url_for('index'))

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

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
        user = User.query.filter(User.username == session.get('user')).first()
        question = Question.query.filter(Question.title == title).first()
        if question:
            return 'question existed.'
        else:
            question = Question(title=title, detail=detail, author_id=author_id)
            question.author = user
            db.session.add(question)
            db.session.commit()
            return redirect(url_for('index'))

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