我有一个 Django 模型,它有一个用于图像的上传字段,我试图验证图像字段以在存储之前检查图像大小并返回优雅的错误消息供用户更正。
我尝试使用以下代码,但它不起作用
admin.py
class BonanzaAdmin(TranslatableAdmin):
list_display = ['get_bonanza_name', 'user_profile', 'publish_date', 'created_by', 'created_at', 'all_translations']
def clean_image(self):
image = self.cleaned_data.get('image')
if not image:
raise forms.ValidationError("No image!")
else:
w, h = get_image_dimensions(image)
if w != 1170:
raise forms.ValidationError("The image is %i pixel wide. It's supposed to be 1170px" % w)
if h != 500:
raise forms.ValidationError("The image is %i pixel high. It's supposed to be 500px" % h)
return image
def save_model(self, request, obj, form, change):
if not change:
obj.created_by = request.user
obj.save()
整个 clean_image() 没有被调用,我也试图将名称反转为 image_clean(),但也没有工作。无论如何,我试图将验证移动到save_model
class BonanzaAdmin(TranslatableAdmin):
list_display = ['get_bonanza_name', 'user_profile', 'publish_date', 'created_by', 'created_at', 'all_translations']
def save_model(self, request, obj, form, change):
image = obj.image
if not image:
raise forms.ValidationError("No image!")
else:
w, h = get_image_dimensions(image)
if w != 1170:
raise forms.ValidationError("The image is %i pixel wide. It's supposed to be 1170px" % w)
if h != 500:
raise forms.ValidationError("The image is %i pixel high. It's supposed to be 500px" % h)
if not change:
obj.created_by = request.user
obj.save()
现在第二段代码工作正常,它通过验证过程,但不显示简单的错误消息。相反,它会引发异常!如何使其显示错误,以便用户更正并重试?
P.S 我使用 django 1.4 和 django-hvad 进行翻译,这就是为什么我继承自 TranslatableAdmin
问候
正如demalexx所说,你应该使用额外的形式来验证你的模型。
class Bonanza(models.Model):
user_profile = models.CharField(max_length = 128)
publish_date = models.DateField()
在管理表单中使用任何验证:
class BonanzaAdminForm(forms.ModelForm):
class Meta:
model = Bonanza
def clean(self):
# Validation goes here :)
raise forms.ValidationError("TEST EXCEPTION!")
和简单的自动生成的管理员:
class BonanzaAdmin(admin.ModelAdmin):
form = BonanzaAdminForm
admin.site.register(Bonanza, BonanzaAdmin)
您继承了ModelAdmin
并且它没有验证方法。相反,您应该重写form
属性以提供自定义表单并向该表单添加验证方法。admin: https://docs.djangoproject.com/en/1.4/ref/contrib/admin/#adding-custom-validation-to-the-admin 中有关于自定义验证的文档