当 html 表单允许文件上传时，Django 停止并显示“生成器引发的 StopIteration”

Question

我的设置是 Windows 10、Python 3.7、Apache 2.4/mod_wsgi。当我enctype="multipart/form-data"在表单中添加它时（仅通过添加此属性，仅 - 没有文件附加到表单）提交时出现此错误：

Django Version: 1.8.5
Exception Type: RuntimeError
Exception Value: generator raised StopIteration
Exception Location: c:\users\holistic\envs\vitadmin\lib\site-packages\django\http\multipartparser.py in read, line 337
Python Executable: C:\Apache24\bin\httpd.exe
Python Version: 3.7.3

我的 Django 代码是这样的：

elif request.method == "POST":
    rid = request.POST.get("recipe", "")
    title = request.POST.get("title")
    content = request.POST.get("content")
    tag_names = request.POST.getlist("tags")
    image = request.FILES.get("image")
    if rid:
        recipe = get_object_or_404(FoodRecipe, pk=rid)
    else:
        recipe = FoodRecipe.objects.create(title=title)
    recipe.content = content
    recipe.title = title
    if image:
        recipe.featured = image
    for tn in tag_names:
        tag, cr = Tag.objects.get_or_create(
            name=tn
        )
        recipe.tags.add(tag)
    recipe.save()

这是完整的追溯：

Environment:
Request Method: POST
Request URL: http://192.168.1.250/recipes/add/
Django Version: 1.8.5
Python Version: 3.7.3
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'tinymce',
 'sekizai',
 'sorl.thumbnail',
 'recipes',
 'guides',
 'inbox',
 'appdata',
 'account',
 'customer',
 'core')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.security.SecurityMiddleware',
 'account.middleware.PasswordChangeMiddleware.PasswordChangeMiddleware')


Traceback:
File "c:\users\holistic\envs\vitadmin\lib\site-packages\django\core\handlers\base.py" in get_response
  125.                     response = middleware_method(request, callback, callback_args, callback_kwargs)
File "c:\users\holistic\envs\vitadmin\lib\site-packages\django\middleware\csrf.py" in process_view
  174.                     request_csrf_token = request.POST.get('csrfmiddlewaretoken', '')
File "c:\users\holistic\envs\vitadmin\lib\site-packages\django\core\handlers\wsgi.py" in _get_post
  137.             self._load_post_and_files()
File "c:\users\holistic\envs\vitadmin\lib\site-packages\django\http\request.py" in _load_post_and_files
  260.                 self._post, self._files = self.parse_file_upload(self.META, data)
File "c:\users\holistic\envs\vitadmin\lib\site-packages\django\http\request.py" in parse_file_upload
  225.         return parser.parse()
File "c:\users\holistic\envs\vitadmin\lib\site-packages\django\http\multipartparser.py" in parse
  149.             for item_type, meta_data, field_stream in Parser(stream, self._boundary):
File "c:\users\holistic\envs\vitadmin\lib\site-packages\django\http\multipartparser.py" in __iter__
  628.             yield parse_boundary_stream(sub_stream, 1024)
File "c:\users\holistic\envs\vitadmin\lib\site-packages\django\http\multipartparser.py" in parse_boundary_stream
  567.     chunk = stream.read(max_header_size)
File "c:\users\holistic\envs\vitadmin\lib\site-packages\django\http\multipartparser.py" in read
  337.         out = b''.join(parts())

Exception Type: RuntimeError at /recipes/add/
Exception Value: generator raised StopIteration

任何想法出了什么问题？

PS：相同的 django 应用程序在 Linux/Nginx/Gunicorn/Python2.7 设置中运行良好。所以，我想它一定是 Django/Python/Apache 之间的一些错误配置。

Answer 1

你的 Django 很旧了，你需要更新。这是一个Python 3.7的兼容性的问题，Django的开发者已经固定在四年前，回来时，它只是一个PendingDeprecationWarning上的Python 3.5。

事实上，您使用的是最后一个没有修复的 Django 版本。甚至 1.8.6 也有修复。