我一直在使用django 1.4制作一个用户可以用来上传一张或多张图片的套餐。
formset用于向导步骤，但手动处理done方法中的is_valid check和formset.save（）。
formset表现得非常奇怪，当我在formset中选择不同的图像时，它可以很好地工作。但是，当我在两个字段中上传相同的图像时，我收到以下错误
ValueError at /item/post-project/
I/O operation on closed file
这很奇怪，我不确定如何调试这样的问题，我尝试使用一个函数来替换文件字段中的upload_to参数，以便始终使用uuid字段，因为文件命名重复，它会抛出此错误，但它没有解决问题。
这是我的功能
AttachmentFormSet = inlineformset_factory(Item, Attachment, extra=attachment_form_extra, max_num=8, can_delete=False, form=AttachmentForm)
formset = AttachmentFormSet(request.POST, request.FILES, instance=instance,)
if formset.is_valid():
formset.save()
有关如何解决此问题的任何建议？
错误堆栈
Environment:
Request Method: POST
Request URL: http://127.0.0.1:8000/item/post-project/
Django Version: 1.4.3
Python Version: 2.7.2
Installed Applications:
('admin_tools',
'admin_tools.theming',
'admin_tools.menu',
'admin_tools.dashboard',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.admin',
'django.contrib.admindocs',
'social_auth',
'account',
'item',
'sponsor',
'pages',
'misc.helper')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware')
Traceback:
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
111. response = callback(request, *callback_args, **callback_kwargs)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
20. return view_func(request, *args, **kwargs)
File "/Users/mo/Projects/pythonic/yrok-env/yrok/yrok/apps/item/views.py" in post_item
105. return response(request)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/views/generic/base.py" in view
48. return self.dispatch(request, *args, **kwargs)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/contrib/formtools/wizard/views.py" in dispatch
223. response = super(WizardView, self).dispatch(request, *args, **kwargs)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/views/generic/base.py" in dispatch
69. return handler(request, *args, **kwargs)
File "/Users/mo/Projects/pythonic/yrok-env/yrok/yrok/apps/item/wizards.py" in post
109. return self.render_done(form, **kwargs)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/contrib/formtools/wizard/views.py" in render_done
328. done_response = self.done(final_form_list, **kwargs)
File "/Users/mo/Projects/pythonic/yrok-env/yrok/yrok/apps/item/wizards.py" in done
156. formset.save()
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/forms/models.py" in save
497. return self.save_existing_objects(commit) + self.save_new_objects(commit)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/forms/models.py" in save_new_objects
628. self.new_objects.append(self.save_new(form, commit=commit))
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/forms/models.py" in save_new
731. obj.save()
File "/Users/mo/Projects/pythonic/yrok-env/yrok/yrok/apps/item/models.py" in save
327. super(Attachment, self).save(force_insert=force_insert, force_update=force_update, using=using)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/db/models/base.py" in save
463. self.save_base(using=using, force_insert=force_insert, force_update=force_update)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/db/models/base.py" in save_base
551. result = manager._insert([self], fields=fields, return_id=update_pk, using=using, raw=raw)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/db/models/manager.py" in _insert
203. return insert_query(self.model, objs, fields, **kwargs)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/db/models/query.py" in insert_query
1593. return query.get_compiler(using=using).execute_sql(return_id)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in execute_sql
911. for sql, params in self.as_sql():
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in as_sql
872. for obj in self.query.objs
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/db/models/fields/files.py" in pre_save
249. file.save(file.name, file, save=False)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/db/models/fields/files.py" in save
86. self.name = self.storage.save(name, content)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/core/files/storage.py" in save
45. name = self._save(name, content)
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/core/files/storage.py" in _save
195. for chunk in content.chunks():
File "/Users/mo/Projects/pythonic/yrok-env/lib/python2.7/site-packages/django/core/files/base.py" in chunks
63. self.seek(0)
Exception Type: ValueError at /item/post-project/
Exception Value: I/O operation on closed file