/%Y/%m",max_length=100)
click_nums = models.IntegerField("点击数",default=0)
add_time = models.DateTimeField...',on_delete=models.CASCADE)
name = models.CharField("章节名",max_length=100)
add_time = models.DateTimeField...",on_delete=models.CASCADE)
name = models.CharField("视频名",max_length=100)
add_time = models.DateTimeField...course = models.ForeignKey(Course,verbose_name='课程',on_delete=models.CASCADE)
add_time = models.DateTimeField.../%Y/%m",max_length=100)
click_nums = models.IntegerField("点击数",default=0)
add_time = models.DateTimeField