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我在 Google App Engine 上使用 Django 1.5，并且正在尝试将文件上传到 Google Cloud Storage。我正在使用 gcs 库并编写了一个自定义文件上传处理程序，我已在 settings.py 中注册为我唯一的文件上传程序。我可以在开发环境的 blobstore 查看器中看到我的文件已正确上传，但是一旦在 views.py 中调用 form.save()，我就会抛出异常，说它是只读文件系统？我知道 Google App Engine 不允许访问文件系统，这就是我首先使用 GCS 的原因！

我需要做些什么来阻止 Django 尝试将文件保存到磁盘吗？

相关代码附在本要点中。

谢谢 ：）

堆栈跟踪：

Environment:


Request Method: POST
Request URL: http://localhost:8080/cms/media/add

Django Version: 1.5
Python Version: 2.7.5
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.staticfiles',
 'django.contrib.messages',
 'api',
 'cms',
 'frontend')
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 "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/core/handlers/base.py" in get_response
  115.                         response = callback(request, *callback_args, **callback_kwargs)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/contrib/auth/decorators.py" in _wrapped_view
  25.                 return view_func(request, *args, **kwargs)
File "/Users/james/Dropbox/University/Year 4/Advanced Development/assignment/cms/views.py" in media_add_or_edit
  44.             form.save()
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/forms/models.py" in save
  370.                              fail_message, commit, construct=False)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/forms/models.py" in save_instance
  87.         instance.save()
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/base.py" in save
  546.                        force_update=force_update, update_fields=update_fields)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/base.py" in save_base
  650.                 result = manager._insert([self], fields=fields, return_id=update_pk, using=using, raw=raw)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/manager.py" in _insert
  215.         return insert_query(self.model, objs, fields, **kwargs)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/query.py" in insert_query
  1673.     return query.get_compiler(using=using).execute_sql(return_id)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/sql/compiler.py" in execute_sql
  936.         for sql, params in self.as_sql():
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/sql/compiler.py" in as_sql
  894.                 for obj in self.query.objs
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/fields/files.py" in pre_save
  250.             file.save(file.name, file, save=False)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/fields/files.py" in save
  86.         self.name = self.storage.save(name, content)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/core/files/storage.py" in save
  48.         name = self._save(name, content)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/core/files/storage.py" in _save
  198.                     fd = os.open(full_path, flags, 0o666)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/devappserver2/python/stubs.py" in fake_open
  71.     raise OSError(errno.EROFS, 'Read-only file system', filename)

Exception Type: OSError at /cms/media/add
Exception Value: [Errno 30] Read-only file system: u'/Users/james/Dropbox/University/Year 4/Advanced Development/assignment/IMG_0746.jpg'
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1 回答 1

3

我最终通过将 FileField 从我的模型移动到我的 ModelForm 来解决这个问题，如下所示：

# Used for uploading media that forms part of a story
class Media(models.Model):
    title = models.CharField(max_length=100)
    type = models.CharField(max_length=5, choices=MEDIA_TYPES)
    content = models.TextField()
    date_created = models.DateTimeField(auto_now_add=True)

# Used to convert the media model to a form in the cms
class MediaForm(forms.ModelForm):
    file = forms.FileField()

    class Meta:
        model = Media
        # Don't show the date created field because we want that to be set automatically
        exclude = ('date_created', 'content',)

我确定我之前尝试过，但它似乎已经解决了我的问题，希望这可以帮助遇到同样问题的其他人。

于 2013-10-26T18:52:20.747 回答