我有一个保存用户个人资料图像的模型。如果上传的图像大于 200x200 像素,则我们将大小调整为 200x200。如果图像正好为 200x200,则我们返回该图像。我现在想要的是向用户抛出一个错误,说这个图像太小了,是不允许的。这是我所拥有的:
class Profile(models.Model):
GENDER_CHOICES = (
('M', 'Male'),
('F', 'Female'),
)
user = models.OneToOneField(User, null=True, on_delete=models.CASCADE)
bio = models.CharField(max_length=200, null=True)
avatar = models.ImageField(upload_to="img/path")
gender = models.CharField(max_length=1, choices=GENDER_CHOICES, null=True)
def save(self, *args, **kwargs):
super(Profile, self).save(*args, **kwargs)
if self.avatar:
image = Image.open(self.avatar)
height, width = image.size
if height == 200 and width == 200:
image.close()
return
if height < 200 or width < 200:
return ValidationError("Image size must be greater than 200")
image = image.resize((200, 200), Image.ANTIALIAS)
image.save(self.avatar.path)
image.close()
当图片的宽度或高度小于 200 像素时,不应上传该图片。但是,正在上传图像。我怎样才能阻止这种情况发生?
您可以在表单中执行此操作,而不是在save()
方法中执行此操作:
from django.core.files.images import get_image_dimensions
from django import forms
class ProfileForm(forms.ModelForm):
class Meta:
model = Profile
def clean_avatar(self):
picture = self.cleaned_data.get("avatar")
if not picture:
raise forms.ValidationError("No image!")
else:
w, h = get_image_dimensions(picture)
if w < 200:
raise forms.ValidationError("The image is %i pixel wide. It's supposed to be more than 200px" % w)
if h < 200:
raise forms.ValidationError("The image is %i pixel high. It's supposed to be 200px" % h)
return picture
这是因为,当您调用save()
时,图像已经上传。所以最好以形式进行。