模型分离--让代码更方便管理

新建models.py，将模型定义全部放到这个独立的文件中。

from werkzeug.security import generate_password_hash,check_password_hashfrom datetime import datetimefrom exts import dbclass 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(200), nullable=False)    nickname = db.Column(db.String(50), nullable=True)@propertydef password(self):     return self._password @password.setterdef password(self, row_password):    self._password = generate_password_hash(row_password)def check_password(self, row_password):    result = check_password_hash(self._password, row_password)    return resultclass 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'))class Comment(db.Model):    __tablename__ = 'commment'    id = db.Column(db.Integer, primary_key=True, autoincrement=True)    author_id = db.Column(db.Integer, db.ForeignKey('User.id'))    question_id=db.Column(db.Integer,db.ForeignKey('question.id'))    detail=db.Column(db.Text,nullable=False)    time = db.Column(db.DateTime, default=datetime.now)    question=db.relationship('Question',backref=db.backref('comments'))    author=db.relationship('User',backref=db.backref('comments'))

       新建exts.py，将db = SQLAlchemy()的定义放到这个独立的文件中。

from flask_sqlalchemy import SQLAlchemydb = SQLAlchemy()

        models.py和主py文件，都从exts.py中导入db。

在主py文件中，对db进行始化，db.init_app(app)。

from flask import Flask,render_template,request,redirect,url_for,sessionfrom flask_sqlalchemy import SQLAlchemyimport configfrom functools import wrapsfrom sqlalchemy import or_, and_from models import Question,User,Commentfrom exts import dbapp = Flask(__name__)app.config.from_object(config)db.init_app(app)