Django 验证 ImageField 尺寸等

Question

我在下面有一个自定义的清理方法:

def clean_image(self):
    image = self.cleaned_data['image']
    if image:
        from django.core.files.images import get_image_dimensions
        w, h = get_image_dimensions(image)
        if not image.content_type in settings.VALID_IMAGE_FORMATS:
            raise forms.ValidationError(u'Only *.gif, *.jpg and *.png images are allowed.')
        if w > settings.VALID_IMAGE_WIDTH or h > settings.VALID_IMAGE_HEIGHT:
            raise forms.ValidationError(u'That image is too big. The image needs to be ' + str(settings.VALID_IMAGE_WIDTH) + 'px * ' + str(settings.VALID_IMAGE_HEIGHT) + 'px (or less).')
        return image

问题场景是这样的:

已上传图片。我现在想使用使用 ImageField 小部件出现的复选框清除它。当提交表格以明确这一点时，clear 没有。

如果我删除我的自定义清理方法， clear 确实有效。因此，我想我的方法做错了。

Answer 1

当 django 实现这个验证时，有 3 个问题:

Django 需要获取这些字段的值，总是需要返回一个值

需要使用您使用的模型的名称放置类 Meta。

在这句话中需要把.get这样

self.cleaned_data.get['image']

代码如下所示:

class Meta: 
    model = NameModel    

def clean_image(self):
    image = self.cleaned_data.get['image']
    if image:
        from django.core.files.images import get_image_dimensions
        w, h = get_image_dimensions(image)
        if not image.content_type in settings.VALID_IMAGE_FORMATS:
            raise forms.ValidationError(u'Only *.gif, *.jpg and *.png images are allowed.')
        if w > settings.VALID_IMAGE_WIDTH or h > settings.VALID_IMAGE_HEIGHT:
            raise forms.ValidationError(u'That image is too big. The image needs to be ' +     str(settings.VALID_IMAGE_WIDTH) + 'px * ' + str(settings.VALID_IMAGE_HEIGHT) + 'px (or less).')
    return image