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=TabError, 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 Post(db.Model):
    __tablename__='post'
    id = db.Column(db.Integer, primary_key=TabError, 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('post'))

db.create_all()



# 查询删除
# user = User.query.filter(User.username == 'lin').first()
# db.session.delete(user)
# db.session.commit()

# 修改
# user = User.query.filter(User.username == 'lin').first()
# user.password = '1234'
# print(user.username,user.password)
# db.session.commit()

# 增加
# user = User(username = 'lin',password = 'lin')
# db.session.add(user)
# db.session.commit()

db.create_all()


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


@app.route("/login/", methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user:
            session['user'] = username
            session.permanent = True
            return redirect(url_for('jianshu'))
        else:
            return 'error username or password'


@app.route("/enroll/", methods=['GET', 'POST'])
def enroll():
    if request.method == 'GET':
        return render_template('enroll.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user:
            return 'username exited'
        else:
            user = User(username=username, password=password)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for('login'))

@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('jianshu'))

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("/post/",methods=['GET','POST'])
@loginFirst
def post():
    if request.method=='GET':
        return render_template('post.html')
    else:
        title=request.form.get('title')
        detail=request.form.get('detail')
        author_id=User.query.filter(User.username==session.get('user')).first().id
        post=Post(title=title,detail=detail,author_id=author_id)
        db.session.add(post)
        db.session.commit()
        return redirect(url_for('jianshu'))



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