使用Cloudinary清除上载的图像时，Django“TypeError:expected string or byteslike object”

Question

我在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传的图像。图像已正确上载和显示；但是，在我的UpdateView中，当用户选中“清除”以删除以前的图像，然后提交表单时，会显示此错误：

TypeError: expected string or bytes-like object

浏览器中的错误页面还显示以下突出显示的消息：

...\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\re.py in match return _compile(pattern, flags).match(string)

我的模型、视图和表单如下所示：

在模型.py公司名称：

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

在视图.py在

^{pr2}$

在表单.py在

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

我认为当字段的值为空时，Cloudinary仍然需要一些东西。我看过文件，搜索过网络，但我不知道怎么解决这个问题。在

编辑：我检查了我的管理员，试图从那里编辑一个项目，但当我选中“清除”复选框并单击“保存”时，也出现了同样的错误。所以问题似乎出在我的模型上如何创建image1字段，因为管理视图只依赖于此。但我还是不知道怎么解决它。在

编辑2:我在图像字段上选中“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\re.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

Answer 1

问题在于CloudinaryField中的to_python方法，它希望image的值为none，但得到的却是False。 解决方案创建一个从父项CloudinaryField继承的新字段应用修复并将其用作模型字段。在

Marco Silva对github问题的解决方案，https://github.com/cloudinary/pycloudinary/issues/98。在

class CloudinaryFieldFix(CloudinaryField):
    def to_python(self, value):
        if value is False:
            return value
        else:
            return super(FixCloudinaryField, self).to_python(value)