4-7 djano在线教育平台----courses models.py设计

本文介绍了一个课程管理系统的模型设计，详细阐述了课程、章节、视频及课程资源等实体之间的关系，并定义了具体的数据字段。

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1、model中涉及的表

这里写图片描述

根据课程页面信息，课程与章节、课程与资源、课程与视频，视频与章节均是一对多的关系，用外键来完成

这里写图片描述

2、编写model

执行命令startapp courses，然后立即注册到settings中

courses models.py

# _*_ coding:utf-8 _*_
from __future__ import unicode_literals
from datetime import datetime

from django.db import models

# Create your models here.


class Course(models.Model):
    name = models.CharField(max_length=50, verbose_name=u"课程名")
    desc = models.CharField(max_length=300, verbose_name=u"课程描述")
    detail = models.TextField(verbose_name=u"课程详情")
    degree = models.CharField(max_length=2, choices=(("cj", "初级"), ("zj", "中级"), ("gj", "高级")))
    learn_times = models.IntegerField(default=0, verbose_name=u"学习时长(分钟)")
    students = models.IntegerField(default=0, verbose_name=u"学习人数")
    fav_nums = models.IntegerField(default=0, verbose_name=u"收藏人数")
    image = models.ImageField(upload_to="courses/%Y%m", verbose_name=u"封面图", max_length=100)
    click_nums = models.IntegerField(default=0, verbose_name=u"点击数")
    add_time = models.DateTimeField(default=datetime.now, verbose_name=u"添加时间")

    class Meta:
        verbose_name = u"课程"
        verbose_name_plural = verbose_name


class Lesson(models.Model):
    course = models.ForeignKey(Course, verbose_name=u"课程")
    name = models.CharField(max_length=100, verbose_name=u"章节名")
    add_time = models.DateTimeField(default=datetime.now, verbose_name=u"添加时间")

    class Meta:
        verbose_name = u"章节"
        verbose_name_plural = verbose_name


class Video(models.Model):
    lesson = models.ForeignKey(Lesson, verbose_name=u"章节")
    name = models.CharField(max_length=100, verbose_name=u"视频名")
    add_time = models.DateTimeField(default=datetime.now, verbose_name=u"添加时间")

    class Meta:
        verbose_name = u"视频"
        verbose_name_plural = verbose_name


class CourseResource(models.Model):
    course = models.ForeignKey(Course, verbose_name=u"课程")
    name = models.CharField(max_length=100, verbose_name=u"名称")
    download = models.FileField(upload_to="course/resource/%Y%m", verbose_name=u"资源文件", max_length=100)
    add_time = models.DateTimeField(default=datetime.now, verbose_name=u"添加时间")

    class Meta:
        verbose_name = u"课程资源"
        verbose_name_plural = verbose_name