- 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。
py:
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) 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 daohang(): return render_template('daohang.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, User.password == password).first() if user: session['user'] = username session.permanent = True return redirect(url_for('daohang')) else: return 'error username or password' @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('regist')) @app.route('/regist/', methods=['GET', 'POST']) def regist(): if request.method == 'GET': return render_template('regist.html') else: username = request.form.get('username') password = request.form.get('password') user = User.query.filter(User.username == username).first() if user: return 'username existed' else: user = User(username=username, password=password) db.session.add(user) db.session.commit() return redirect(url_for('login')) 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 question = Question(title=title, detail=detail, author_id=author_id) db.session.add(question) db.session.commit() return redirect(url_for('daohang')) if __name__ == '__main__': app.run(debug=True)