Django sorl:没有足够的值来解压(预期 2,得到 1)

Django sorl: not enough values to unpack (expected 2, got 1)

我正在尝试使用一个表单来根据将要上传的图像生成缩略图

我将使用 sorl 生成缩略图,并遵循以下文档:

当我尝试生成缩略图时,我得到了

的错误
not enough values to unpack (expected 2, got 1)

我不明白我做错了什么,总而言之,我上传了图片并将其保存在我的根目录中,然后我尝试创建缩略图

请问有没有什么办法可以取消原图在根目录下的保存呢?我打算将图像和拇指发送到 google 云存储

我的forms.py:

from django import forms
class FileFieldForm(forms.Form):
    file_field = forms.FileField(widget=forms.ClearableFileInput(attrs={'multiple': True}))

我的 html 文件:upload.html

<html>
    <head></head>
    <body>
        <h3>Read File Content</h3>
        <form enctype="multipart/form-data" action="" method="post">
            {% csrf_token %}
            {{ form }}
            <input type="submit" value="Save">
        </form>
    </body>
</html>

我的 views.py 看起来像:

from sorl.thumbnail import ImageField, get_thumbnail
from .forms import FileFieldForm

class FileFieldView(FormView):
    form_class = FileFieldForm
    template_name = 'app_workflow/upload.html'  # Replace with your template.
    success_url = '/photo'  # Replace with your URL or reverse().

    def post(self, request, *args, **kwargs):
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        files = request.FILES.getlist('file_field')
        if form.is_valid():
            for f in files:
                with open(f.name, 'wb+') as destination:
                    for chunk in f.chunks():
                        destination.write(chunk)
                    im = get_thumbnail(f.name, '100x100', crop='center', quality=99)

            return self.form_valid(form)
        else:
            return self.form_invalid(form)

正如您在问题中所说,您不想存储在根目录中并生成缩略图。那么我会建议这样的事情:

from PIL import Image

class FileFieldView(FormView):
    form_class = FileFieldForm
    template_name = 'app_workflow/upload.html'  # Replace with your template.
    success_url = '/photo'  # Replace with your URL or reverse().

    def form_valid(self, *args, **kwargs):
        img_size = (100, 100)
        files = self.request.FILES.getlist('file_field')
        for f in files:
           im = Image.open(f)
           im.thumbnail(img_size) 
           # your thumbnail image is in memory now
           # you can now store it in your model and use django-storages to upload it to gcloud

        return super().form_valid(*args, **kwargs)

这里我不存储图片,直接在PIL.Image模块中加载生成缩略图。您可以使用 django-storages 将数据从 FileField 上传到 gcloud。

存储在根目录中:

然后你可以这样修改代码:

for f in files:
   for chunk in f.chunks():
      destination.write(chunk)
   im = Image.open(f)
   im.thumbnail(img_size)
   im.save('thumb_{}'.format(f.name))