第二节，Django+Xadmin打造上线标准的在线教育平台—创建课程app，在models.py文件生成4张表，课程表、课程章节表、课程视频表、课程资源表

第二节，Django+Xadmin打造上线标准的在线教育平台—创建课程app，在models.py文件生成4张表，课程表、课程章节表、课程视频表、课程资源表

 

创建名称为app_courses的课程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 Course(models.Model):
    name = models.CharField(max_length=50, verbose_name=\'课程名称\')
    desc = models.CharField(max_length=300, verbose_name=\'课程描述\')
    detail = models.TextField(verbose_name=\'课程详情\')
    degree = models.CharField(verbose_name=\'课程级别\', choices=((\'cj\', \'初级\'), (\'zj\', \'中级\'), (\'gj\', \'高级\')), max_length=3)
    learn_times = models.IntegerField(default=0, verbose_name=\'学习时长(分钟)\')
    students = models.IntegerField(default=0, verbose_name=\'学习人数\')
    fav_nums = models.IntegerField(default=0, verbose_name=\'收藏人数\')
    image = models.ImageField(upload_to=\'courses/%Y/%m\', verbose_name=\'课程封面图\', max_length=100)
    click_nums = models.IntegerField(default=0, verbose_name=\'点击数\')
    add_time = models.DateTimeField(default=datetime.now, verbose_name=\'添加时间\')

    class Meta:
        verbose_name = \'课程表\'
        verbose_name_plural = verbose_name


class Lesson(models.Model):
    course = models.ForeignKey(Course,on_delete = models.CASCADE, verbose_name=\'外键课程表\')      # 外键链表，外键连接Course表的主键，一对多关系
    name = models.CharField(max_length=100, verbose_name=\'章节名\')
    add_time = models.DateTimeField(default=datetime.now, verbose_name=\'添加日期\')

    class Meta:
        verbose_name = \'课程章节表\'
        verbose_name_plural = verbose_name


class Video(models.Model):
    lesson = models.ForeignKey(Lesson,on_delete = models.CASCADE, verbose_name=\'外键章节表\')
    name = models.CharField(max_length=100, verbose_name=\'视频名\')
    add_time = models.DateTimeField(default=datetime.now, verbose_name=\'添加日期\')

    class Meta:
        verbose_name = \'课程视频表\'
        verbose_name_plural = verbose_name


class CourseResource(models.Model):
    course = models.ForeignKey(Course,on_delete = models.CASCADE, verbose_name=\'外键课程表\')
    name = models.CharField(max_length=100, verbose_name=\'课程资源名称\')
    download = models.FileField(upload_to=\'course/resource/%Y/%m\', verbose_name=\'资源文件\', max_length=100)
    add_time = models.DateTimeField(default=datetime.now, verbose_name=\'添加日期\')

    class Meta:
        verbose_name = \'课程资源表\'
        verbose_name_plural = verbose_name