模型分离（选做）

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_hash
from datetime import datetime
from exts import db

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(200), nullable=False)
    nickname = db.Column(db.String(50), nullable=True)

@property
def password(self):
     return self._password

 @password.setter
def 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 result

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'))

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 SQLAlchemy
db = 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,session
from flask_sqlalchemy import SQLAlchemy
import config
from functools import wraps
from sqlalchemy import or_, and_
from models import Question,User,Comment
from exts import db


app = Flask(__name__)
app.config.from_object(config)
db.init_app(app)