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。

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

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 datetime import datetime
from werkzeug.security import check_password_hash
from werkzeug.security import generate_password_hash

from exts import db



#登录的数据库
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)
    _password = db.Column(db.String(200), nullable=False)#内部使用
    nickname = db.Column(db.String(20))

    @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

#db.create_all()


#问题页的数据库
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('questions'))
#db.create_all()

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'))
    detail = db.Column(db.Text, nullable=False)
    creat_time = db.Column(db.DateTime, default=datetime.now)
    question=db.relationship('Question',backref=db.backref('comments',order_by=creat_time.desc))
    author = db.relationship('User', backref=db.backref('comments'))

#db.create_all()

from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
import config
from flask import Flask, render_template, request, redirect, url_for,session
from functools import wraps
from datetime import datetime
from sqlalchemy import or_, and_
from werkzeug.security import check_password_hash
from werkzeug.security import generate_password_hash

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



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

#db = SQLAlchemy(app)
db.init_app(app)









# user=User(username='mis1',password='11111')
# db.session.add(user)
# db.session.commit()




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

# 调用数据库把用户评论放在首页
@app.route('/index/')
def index():
    context = {
            'questions':Question.query.order_by('-creat_time').all()

        }

    return render_template('index.html',**context)

@app.route('/login/',methods=['GET','POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    else:
        usern = request.form.get('username')
        passw = request.form.get('password')
        user = User.query.filter(User.username == usern).first()
        if user:
            if user.check_password(passw):
                session['user'] = usern
                session['userid'] = user.id
                session.permanent = True
                return redirect(url_for('base'))
            else:
                return u'password error'
        else:
            return u'password is not existed'



@app.route('/regist/',methods=['GET','POST'])
def regist():
    if request.method=='GET':
        return render_template('regist.html')
    else:
        usern=request.form.get('username')
        passw=request.form.get('password')
        nickn=request.form.get('nickname')
        user=User.query.filter(User.username==usern).first()
        if user:
            return u'username existed'
        else:
            user=User (username=usern,password=passw,nickname=nickn)
            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#发布前登录，python装饰器
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('index'))

    # 评论页的详细页
@app.route('/detail/')
def detail(question_id):

    quest = Question.query.filter(Question.id == question_id).first()
    return render_template('detail.html', ques=quest)


#评论功能
@app.route('/comment/',methods=['POST'])
@loginFirst#发布前登录，python装饰器
def comment():
    detail = request.form.get('fabu')
    author_id = User.query.filter(User.username == session.get('user')).first().id
    quest_id =request.form.get('question_id')
    pinglun = Comment(question_id=quest_id,detail=detail, author_id=author_id)
    db.session.add(pinglun)
    db.session.commit()
    return redirect(url_for('detail',question_id=quest_id))

#个人信息页
@app.route('/usercenter//')
@loginFirst#发布前登录，python装饰器
def usercenter(user_id,tag):
    user=User.query.filter(User.id== user_id).first()
    context={
      'user':user
    }

    if tag=='1':
        return render_template('user1.html',**context)
    elif tag=='2':
        return render_template('user2.html',**context)
    else:
        return render_template('user3.html',**context)



@app.context_processor
def mycontext():
    usern=session.get('user')
    if usern:
        return{'username':usern}
    else:
        return{}



@app.route('/search/')
def search():
    qu=request.args.get('q')
    ques=Question.query.filter(or_(Question.title.contains(qu),Question.detail.contains(qu))).order_by('-creat_time')
    return render_template('index.html', questions=ques)



@app.route('/logout/')
def logout():
    session.clear()
    return redirect(url_for('index'))






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