Question

我创建了文章创建表单。还有一个图片上传按钮。

我用枕头调整大小以上传图像。但是当我说保存表单而不上传图片时，会出现此错误；

clean_image中的forms.py，第19行 “ NoneType”对象没有属性“名称”

当我将图片与图片一起保存时，没有问题。但是没有图像我就无法保存。

怎么说，如果不上传任何图片“跳过此部分”（def clean_image（self）:)” ？

forms.py

from django import forms
from .models import Article

from django.core.files.base import ContentFile
from django.utils.translation import ugettext_lazy as _
from PIL import Image
import hashlib
import io

class ArticleForm(forms.ModelForm):
    class Meta:
        model = Article
        fields = ["title", "content","image"]

    def clean_image(self):
        image = self.cleaned_data.get('image')
        md5 = hashlib.md5()
        md5.update(repr(image.name).encode('utf-8')) **#19.line is here!!!**
        file_name = md5.hexdigest()

        if image.size > 30 * 1024 * 1024:
            raise forms.ValidationError(_('File is too big.'), code='invalid')

        image = Image.open(image)

        if image.size[0] < 600 or image.size[1] < 600:
            raise forms.ValidationError(_('Your image needs to be at least 600x600.'))

        if image.format not in ('BMP', 'PNG', 'JPEG', 'GIF'):
            raise forms.ValidationError(_("Unsupported image type. Please uplod a bmp, png, jpeg, or gif."),
                                        code='invalid')

        image.thumbnail([1024, 1024], Image.ANTIALIAS)
        image_io = io.BytesIO()
        image.save(image_io, format=image.format)
        image_name = '{}.{}'.format(file_name, image.format)
        image = ContentFile(image_io.getvalue(), image_name)

        return image

非常感谢您！

Answer 1

在处理图像之前只需检查该字段是否为空：

def clean_image(self):
    image = self.cleaned_data.get('image')
    if image:
        md5 = hashlib.md5()
        # ... the rest of the image processing stuff goes here...
    return image

Django，如果图像为空

1 个答案: