一个课程分多个章节，一个章节分多个视频。在前端遍历所有的章节，在章节下遍历所有视频。Video有个外建lesson，lesson有个外键course。

class Course(models.Model):
    def get_course_lesson(self):
        """
        获取课程所有章节
        """
        return self.lesson_set.all()


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

    class Meta:
            verbose_name = "章节"
            verbose_name_plural = verbose_name

    def __str__(self):
        return self.name

    def get_lesson_video(self):
        """
        获取章节视频
        """
        return  self.video_set.all()


class Video(models.Model):
    lesson = models.ForeignKey(Lesson, verbose_name="章节")
    name = models.CharField(max_length=100, verbose_name="视频名")
    add_time = models.DateTimeField(default=datetime.now, verbose_name="添加时间")
    url = models.CharField(max_length=200,default='',verbose_name='访问地址')
    learn_times = models.IntegerField(default=0, verbose_name="学习时长（分钟数）")

    class Meta:
            verbose_name = "视频"
            verbose_name_plural = verbose_name

    def __str__(self):
        return self.name

这样就可以在前端调用了。{% for lesson in course.get_course_lesson %}、
{% for video in lesson.get_lesson_video %}。
然后是资料下载。也类似。

<div class="box mb40">
                        <h4>资料下载</h4>
                        <ul class="downlist">
                            {% for course_resource in course_resources%}
                            <li>
                                <span ><i class="aui-iconfont aui-icon-file"></i>&nbsp;&nbsp;{{ course_resource.name }}</span>
                                <a href="{{ MEDIA_URL }}{{ course_resource.download }}" class="downcode" target="_blank" download="" data-id="274" title="">下载</a>
                            </li>
                            {% endfor %}
                        </ul>
                    </div>