Question

views.py

if request.is_ajax():
    testpic = TestPic.objects.get(pk=1)

    form = TestPicForm(request.POST, request.FILES, instance=testpic)
    if form.is_valid():
        form.save()

forms.py

class TestPicForm(forms.ModelForm):

    class Meta:
        from .models import TestPic
        model = TestPic
        fields = ('file', 'file_50',)

    def save(self):
        test_photo = super(TestPicForm, self).save()
        file = user_photo.file
        image = Image.open(file)
        rotated_image = image.rotate(90, expand=True)
        cropped_image = rotated_image.resize((300, 300), Image.ANTIALIAS)
        cropped_50_image = rotated_image.resize((50, 50), Image.ANTIALIAS)

        cropped_image.save(test_photo.file.path)
        file.seek(0)  
        cropped_50_image.save(test_photo.file_50.path)

        return user_photo

models.py

class TestPic(models.Model):
    file = models.ImageField(null=True, blank=True, default=None, upload_to="photo/%Y/%m/%d")
    file_50 = models.ImageField(null=True, blank=True, default=None, upload_to="photo/%Y/%m/%d")

此代码用于上传图像文件，将其调整为两个不同的大小并保存。

可悲的是，它仅在字段file_50上有任何文件时有效。

换句话说，如果some_file_50.jpeg字段上有文件file_50，则可以上传图像文件，但是在django-admin中，{{ 1}}字段。（file_50字段的文件名已更改。）但是file的内容已更改。（我可以通过单击django-admin上的图像文件链接来查看这些更改），some_file_50.jpeg不可更改。
当some_file_50.jpeg字段上没有文件时，它将引发错误： file_50

问题：如何解决？感谢您的阅读。

ADD追溯：

The 'file_50' attribute has no file associated with it.

ADD html，jquery ajax上传代码：

Internal Server Error: /accounts/crop/
Traceback (most recent call last):
  File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django\core\handlers\exception.py", line 35, in inner
    response = get_response(request)
  File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django\core\handlers\base.py", line 128, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django\core\handlers\base.py", line 126, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "D:\pythonDev\project\upward\chatkaboo\authapp\views.py", line 833, in crop
    form.save()
  File "D:\pythonDev\project\upward\chatkaboo\authapp\forms.py", line 182, in save
    cropped_50_image.save(user_photo.file_50.path)
  File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django\db\models\fields\files.py", line 56, in path
    self._require_file()
  File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django\db\models\fields\files.py", line 38, in _require_file
    raise ValueError("The '%s' attribute has no file associated with it." % self.field.name)
ValueError: The 'file_50' attribute has no file associated with it.

Answer 1

看着您的save方法，我看不到您将修改后的文件分配到模型的file_50字段的位置。我认为您想做的事情类似于以下内容？

cropped_50_image = rotated_image.resize((50, 50), Image.ANTIALIAS) 
# Assign cropped image to image_50 model field
user_photo.image_50 = cropped_50_image
user_photo.save()

这只是伪代码。在分配as discussed here之前，可能需要包装该文件以使其成为正确的Django文件。

django，“ some_field”属性没有与之关联的文件

1 个答案: