第三节，Django+Xadmin打造上线标准的在线教育平台—创建课程机构app，在models.py文件生成3张表，城市表、课程机构表、讲师表

第三节，Django+Xadmin打造上线标准的在线教育平台—创建课程机构app，在models.py文件生成3张表，城市表、课程机构表、讲师表

创建名称为app_organization的课程机构APP，写数据库操作文件models.py

models.py文件

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from __future__ import unicode_literals
from datetime import datetime

from django.db import models        # 导入models对象


class CityDict(models.Model):
    name = models.CharField(max_length=20, verbose_name='城市')
    desc = models.CharField(max_length=200, verbose_name='描述')
    add_time = models.DateTimeField(default=datetime.now, verbose_name='添加日期')

    class Meta:
        verbose_name = '城市表'
        verbose_name_plural = verbose_name


class CourseOrg(models.Model):
    name = models.CharField(max_length=50, verbose_name='机构名称')
    desc = models.TextField(verbose_name='机构描述')
    click = models.IntegerField(default=0, verbose_name='点击数')
    fav_nums = models.IntegerField(default=0, verbose_name='收藏数')
    image = models.ImageField(upload_to='org/%Y/%m', verbose_name='封面图', max_length=100)
    address = models.CharField(max_length=150, verbose_name='机构地址')
    city = models.ForeignKey(CityDict, verbose_name='外键城市表')
    add_time = models.DateTimeField(default=datetime.now, verbose_name='添加日期')

    class Meta:
        verbose_name = '课程机构表'
        verbose_name_plural = verbose_name


class Teacher(models.Model):
    org = models.ForeignKey(CourseOrg, verbose_name='外键课程机构表')
    name = models.CharField(max_length=50, verbose_name='讲师名称')
    work_years = models.IntegerField(default=0, verbose_name='工作年限')
    work_company = models.CharField(max_length=50, verbose_name='就职公司')
    work_position = models.CharField(max_length=50, verbose_name='公司职位')
    points = models.CharField(max_length=50, verbose_name='教学特点')
    click = models.IntegerField(default=0, verbose_name='点击数')
    fav_nums = models.IntegerField(default=0, verbose_name='收藏数')
    add_time = models.DateTimeField(default=datetime.now, verbose_name='添加日期')

    class Meta:
        verbose_name = '讲师表'
        verbose_name_plural = verbose_name

ForeignKey 在Django2.2.8上必须加上on_delete = models.CASCADE