django如何实现文件的上传，修改，删除，展示（01）

class AdsUserModel(models.Model):
"""
define the ads user model
"""

adsUser = models.CharField(max_length=100,  error_messages={'required': u'填写用户名'})
adsNo   = models.CharField(max_length=50, null=True)
type    = models.CharField(max_length=50, null=True)

class Meta:
pass

def __str__(self):
return self.adsNo

class AdsImgModel(models.Model):
    """
    """
    user1  = models.ForeignKey('AdsUserModel', on_delete=models.CASCADE)
    item1 = models.FileField(upload_to='uploads/%Y/%m/%d/', null=True, blank=True)
    item2 = models.FileField(upload_to='uploads/%Y/%m/%d/', null=True, blank=True)
    item3 = models.FileField(upload_to='uploads/%Y/%m/%d/', null=True, blank=True)
    item4 = models.FileField(upload_to='uploads/%Y/%m/%d/', null=True, blank=True)
    item5 = models.FileField(upload_to='uploads/%Y/%m/%d/', null=True, blank=True)
    img1 = models.ImageField(upload_to='uploads/%Y/%m/%d/', null=True, blank=True)
    img2 = models.ImageField(upload_to='uploads/%Y/%m/%d/', null=True, blank=True)
    img3 = models.ImageField(upload_to='uploads/%Y/%m/%d/', null=True, blank=True)
    img4 = models.ImageField(upload_to='uploads/%Y/%m/%d/', null=True, blank=True)
    img5 = models.ImageField(upload_to='uploads/%Y/%m/%d/', null=True, blank=True)

    class Meta:
        pass

    def __str__(self):
        return self.item1