关于python：Django – 使用Cloudinary清除上传的图像时，’TypeError：预期字符串或类字节对象’

Django - 'TypeError: expected string or bytes-like object' when clearing an uploaded image with Cloudinary

我正在Django应用程序中使用Cloudinary来存储和服务用户在我的站点的一个视图中上载的图像。图像将被正确上载和显示；但是，在我的更新视图中，当用户选中"清除"以删除上一个图像，然后提交表单时，将显示此错误：

TypeError: expected string or bytes-like object

浏览器中的"错误"页还显示这些突出显示的消息：

...\lib\site-packages\cloudinary\models.py in to_python
return self.parse_cloudinary_resource(value) ...

...\lib\site-packages\cloudinary\models.py in parse_cloudinary_resource
m = re.match(CLOUDINARY_FIELD_DB_RE, value) ...

...\AppData\Local\Programs\Python\Python36-32\lib
e.py in match
return _compile(pattern, flags).match(string)

以下是我的模型、视图和表单的外观：

模型：

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class Item(models.Model):
name = models.CharField(max_length=255)
image1 = CloudinaryField('image', blank=True, null=True)

VIEW

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class ItemUpdateView(LoginRequiredMixin, UpdateView):
model = models.Item
form_class = forms.ItemForm

表单

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class ItemForm(forms.ModelForm):
image1 = CloudinaryFileField(
required=False,
options = {'crop': 'limit', 'width': 546, 'height': 1000,})
class Meta:
model = models.Item
fields = ("image1","name")

我认为当字段值为空时，Cloudinary仍在期待一些东西。我已经查看了文档并搜索了网络，但我无法解决这个问题。

编辑：我检查了我的管理员并试图从那里编辑一个项目，当我选中"清除"复选框并点击"保存"时，得到了相同的错误。因此，问题似乎在于我如何在我的模型上创建IMAGE1字段，因为管理视图将仅依赖于此。但我还是不知道怎么修。

edit2:在"图像"字段上选中"清除"并单击"保存"时的完整回溯，来自管理员：

Environment:

Request Method: POST Request URL:
http://127.0.0.1:8000/admin/items/item/4/change/

Django Version: 1.11.1 Python Version: 3.6.1 Installed Applications:
['django.contrib.admin',

'django.contrib.auth',

'django.contrib.contenttypes',

'django.contrib.humanize',

'django.contrib.sessions',

'django.contrib.messages',

'django.contrib.staticfiles',

'django.contrib.sites',

'cloudinary',

'allauth',

'allauth.account',

'allauth.socialaccount',

'allauth.socialaccount.providers.google',

'allauth.socialaccount.providers.twitter',

'haystack',

'items']

Installed Middleware:
['django.middleware.security.SecurityMiddleware',

'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']

Traceback:

File
"D:\projects\django\gia\lib\site-packages\django\core\handlers\exception.py"
in inner
41. response = get_response(request)

File
"D:\projects\django\gia\lib\site-packages\django\core\handlers\base.py"
in _get_response
187. response = self.process_exception_by_middleware(e, request)

File
"D:\projects\django\gia\lib\site-packages\django\core\handlers\base.py"
in _get_response
185. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File
"D:\projects\django\gia\lib\site-packages\django\contrib\admin\options.py"
in wrapper
551. return self.admin_site.admin_view(view)(*args, **kwargs)

File
"D:\projects\django\gia\lib\site-packages\django\utils\decorators.py"
in _wrapped_view
149. response = view_func(request, *args, **kwargs)

File
"D:\projects\django\gia\lib\site-packages\django\views\decorators\cache.py"
in _wrapped_view_func
57. response = view_func(request, *args, **kwargs)

File
"D:\projects\django\gia\lib\site-packages\django\contrib\admin\sites.py"
in inner
224. return view(request, *args, **kwargs)

File
"D:\projects\django\gia\lib\site-packages\django\contrib\admin\options.py"
in change_view
1511. return self.changeform_view(request, object_id, form_url, extra_context)

File
"D:\projects\django\gia\lib\site-packages\django\utils\decorators.py"
in _wrapper
67. return bound_func(*args, **kwargs)

File
"D:\projects\django\gia\lib\site-packages\django\utils\decorators.py"
in _wrapped_view
149. response = view_func(request, *args, **kwargs)

File
"D:\projects\django\gia\lib\site-packages\django\utils\decorators.py"
in bound_func
63. return func.get(self, type(self))(*args2, **kwargs2)

File
"D:\projects\django\gia\lib\site-packages\django\contrib\admin\options.py"
in changeform_view
1408. return self._changeform_view(request, object_id, form_url, extra_context)

File
"D:\projects\django\gia\lib\site-packages\django\contrib\admin\options.py"
in _changeform_view
1440. if form.is_valid():

File"D:\projects\django\gia\lib\site-packages\django\forms\forms.py"
in is_valid
183. return self.is_bound and not self.errors

File"D:\projects\django\gia\lib\site-packages\django\forms\forms.py"
in errors
175. self.full_clean()

File"D:\projects\django\gia\lib\site-packages\django\forms\forms.py"
in full_clean
386. self._post_clean()

File"D:\projects\django\gia\lib\site-packages\django\forms\models.py"
in _post_clean
396. self.instance.full_clean(exclude=exclude, validate_unique=False)

File
"D:\projects\django\gia\lib\site-packages\django\db\models\base.py" in
full_clean
1226. self.clean_fields(exclude=exclude)

File
"D:\projects\django\gia\lib\site-packages\django\db\models\base.py" in
clean_fields
1268. setattr(self, f.attname, f.clean(raw_value, self))

File
"D:\projects\django\gia\lib\site-packages\django\db\models\fields__init__.py"
in clean
601. value = self.to_python(value)

File"D:\projects\django\gia\lib\site-packages\cloudinary\models.py"
in to_python
74. return self.parse_cloudinary_resource(value)

File"D:\projects\django\gia\lib\site-packages\cloudinary\models.py"
in parse_cloudinary_resource
50. m = re.match(CLOUDINARY_FIELD_DB_RE, value)

File
"C:\Users\samee\AppData\Local\Programs\Python\Python36-32\lib
e.py"
in match
172. return _compile(pattern, flags).match(string)

Exception Type: TypeError at /admin/items/item/4/change/ Exception
Value: expected string or bytes-like object