我有一个模型表单,它有一个名为“横幅”的图像字段,我正在尝试验证文件大小和尺寸,并在图像太大时提供错误。
这是models.py:
class Server(models.Model):
id = models.AutoField("ID", primary_key=True, editable=False)
servername = models.CharField("Server Name", max_length=20)
ip = models.CharField("IP Address", max_length=50)
port = models.CharField("Port", max_length=5, default='25565')
banner = models.ImageField("Banner", upload_to='banners', max_length=100)
description = models.TextField("Description", blank=True, max_length=3000)
rank = models.IntegerField(default=0)
votes = models.IntegerField(default=0)
website = models.URLField("Website URL", max_length=200, blank=True)
user = models.ForeignKey(User)
motd = models.CharField("MOTD", max_length=150, default='n/a')
playersonline = models.CharField("Online Players", max_length=7, default='n/a')
online = models.BooleanField("Online", default=False)
sponsored = models.BooleanField("Sponsored", default=False)
lastquery = models.DateTimeField('Last Queried', auto_now=True)
slugurl = models.SlugField("SlugURL", max_length=50)
def __unicode__(self):
return "%s (%s:%s)" % (self.servername, self.ip, self.port)
这是带有自定义验证的 forms.py:
class AddServer(ModelForm):
class Meta:
model = Server
fields = ('servername', 'ip', 'port', 'website', 'description', 'banner')
# Add some custom validation to our image field
def clean_image(self):
image = self.cleaned_data.get('banner', False)
if image:
if image._size > 1*1024*1024:
raise ValidationError("Image file too large ( maximum 1mb )")
if image._height > 60 or image._width > 468:
raise ValidationError("Image dimensions too large ( maximum 468x60 pixels )")
return image
else:
raise ValidationError("Couldn't read uploaded image")
从我读过的内容来看,这应该可以,但是无论大小如何,图像都会上传。
我做错了什么还是有更好的方法来做这件事?