模型分离（选做）

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(100), nullable=False)
    _password = db.Column(db.String(500), nullable=False)

    @property
    def password(self):  # 外部使用
        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)
    create_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__ = ‘comment‘
    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‘))
    create_time = db.Column(db.DateTime, default=datetime.now)
    detail = db.Column(db.Text, nullable=False)
    question = db.relationship(‘Question‘,backref=db.backref(‘comments‘,order_by=create_time.desc))
    author = db.relationship(‘User‘,backref=db.backref(‘comments‘))

from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()

from models import Question,User,Comment
from exts import db

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