添加 :multipart =>true 抛出未定义的方法 "name"错误 [英] Adding :multipart => true throws Undefined Method "name" error
问题描述
我在这个上面画了一个空白.这是我的问题:
I'm drawing a blank on this one. Here's my problem:
短版
我的 image#create 操作在 image.save 调用上失败并抛出 Undefined method "name" for nil:NilClass.图像模型包括通过 paperclip gem 上传的文件.
My image#create action is failing on the image.save call and throwing Undefined method "name" for nil:NilClass. The Image model includes a file upload via paperclip gem.
扔给我的部分:
错误仅在我包含 :multipart => 时发生.真实在提交表单上
the error only occurs when I include :multipart => true on the submitting form
当我把它拿出来时，表格工作得很好，当然图片文件没有上传.有关失败的详细信息，请参阅下面的堆栈跟踪.在尝试为 INSERT 语句引用某些内容时，它看起来像是达到了 nil 值，但我不知道是什么.我的控制器参数看起来没问题，我通过记录器检查以确保新的 Image 实例在调用保存之前正确构建.
When I take that out, the form works perfectly, except of course the image file doesn't get uploaded. See the stack trace below for details on where it fails. It looks like its hitting a nil value when trying to quote something for the INSERT statement, but I can't figure out what. My controller parameters look ok, and I checked via the logger to make sure the new Image instance is properly built just before it hits the save call.
额外细节
我会尽量包括我能想到的所有细节，按重要性排序:
I'll try to include all the details I can think of, ordered by importance:
我正在使用 paperclip 并尝试通过 S3 存储，尽管此问题仍然存在当我完全注释掉图像模型中的
has_attached_file行时.
I'm using paperclip and attempting to store via S3, although this problem still occurs when I completely comment out the
has_attached_fileline in my Image model.
Image 是 Collection 中的嵌套资源，由其 to_param 方法中的 slug 引用.
Image is a nested resource inside Collection, which is referenced by a slug in its to_param method.
我有一个多租户系统的基础知识(又名 Basecamp 风格的用户子域，通过一个涵盖所有组件的中央用户模型实现).
I have the basics of a multi-tenant system (aka Basecamp-style user subdomains, implemented via a central user model that scopes all the components).
传递给控制器的参数
{"utf8"=>"âœ"",
"authenticity_token"=>"JYCMky7851j5cW4ChSWUCCL/02iePf6i/QWAgR8q5tE=",
"image"=>{"name"=>"My testerific image 2",
"slug"=>"my-testerific-image-2",
"description"=>"w",
"collection_id"=>"2",
"sort"=>"3",
"picture_file_name"=>#<ActionDispatch::Http::UploadedFile:0x00000101b3f540 @original_filename="David's pic 005.jpeg",
@content_type="image/jpeg",
@headers="Content-Disposition: form-data; name=\"image[picture_file_name]\"; filename=\"David's pic 005.jpeg\"\r\nContent-Type: image/jpeg\r\n",
@tempfile=#<File:/var/folders/df/mvsv5cs137gbyl8r7h428zp40000gn/T/RackMultipart20110814-64770-duz6wu>>},
"commit"=>"Create Image",
"collection_id"=>"my-new-collection"}
完整的堆栈跟踪
activesupport (3.0.9) lib/active_support/whiny_nil.rb:48:in 'method_missing'
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/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:323:in 'dump_ivars'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:85:in 'visit_Object'
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/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych.rb:165:in 'dump'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/core_ext.rb:13:in 'psych_to_yaml'
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activerecord (3.0.9) lib/active_record/persistence.rb:40:in 'save'
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activerecord (3.0.9) lib/active_record/transactions.rb:251:in 'rollback_active_record_state!'
activerecord (3.0.9) lib/active_record/transactions.rb:239:in 'save'
app/controllers/images_controller.rb:42:in 'block in create'
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actionpack (3.0.9) lib/action_controller/metal/mime_responds.rb:264:in 'retrieve_response_from_mimes'
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app/controllers/images_controller.rb:40:in 'create'
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actionpack (3.0.9) lib/action_controller/metal/instrumentation.rb:30:in 'block in process_action'
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actionpack (3.0.9) lib/action_controller/metal/rescue.rb:17:in 'process_action'
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railties (3.0.9) lib/rails/rack/logger.rb:13:in 'call'
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<internal:prelude>:10:in 'synchronize'
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actionpack (3.0.9) lib/action_dispatch/middleware/static.rb:30:in 'call'
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更新
根据要求，型号代码:
Update
As requested, model code:
class Image < ActiveRecord::Base
belongs_to :collection
belongs_to :user
before_save :create_slug
has_attached_file :picture,
#:styles => {
# :thumb => '100x100>',
# :full => '800x800>'
#},
:storage => :s3,
:s3_credentials => Rails.root.join( 'config', 's3.yml' ),
:path => ":id/:style/:filename"
def to_param
self.name.parameterize
end
private
def create_slug
self.slug = self.to_param
end
end
更新 2
我比较了用 :multipart => 构建的 与没有它，并确认唯一的区别是文件上传字段，Image 实例；truepicture_file_name.没有 :multipart =>true，它是一个带有文件名的字符串(并不奇怪).有了它，它就是一个 ActionDispatch::Http::UploadedFile 的实例.鉴于堆栈跟踪显示其在 to_yaml 调用期间失败，也许问题在于 UploadedFile 实例转换为 YAML?
Update 2
I compared the Image instance that was built with :multipart => true vs without it, and confirmed the only difference is the file upload field, picture_file_name. Without :multipart => true, it a string with the filename (not surprising). With it, it is an instance of ActionDispatch::Http::UploadedFile. Given that the stack trace shows its failing during a to_yaml call, perhaps the problem lies with the UploadedFile instance converting to YAML?
推荐答案
好吧，我终于下定决心，通过记录器输出追踪我的 ActiveRecord 源代码.结果，正如我怀疑的那样，它未能保存 UploadedFile，因为它无法将其转换为 YAML.
Well, I finally buckled down and traced my way through the ActiveRecord source code via logger outputs. Turns out, as I suspected, it was failing to save the UploadedFile because it couldn't convert it to YAML.
然而，这是因为我犯了一个愚蠢的错误.在我的提交表单中，我有:
However, this because of a stupid mistake on my part. In my submitting form, I had:
<%= f.file_field :picture_file_name %>
应该是什么时候:
<%= f.file_field :picture %>
paperclip gem 知道 :picture 是上传的文件，并使用背景魔法将文件名保存到正确的字段.我只是低估了我猜的易用性！
The paperclip gem understands that :picture is the uploaded file and works the background magic to save the file name to the proper field. I just underestimated the ease of use I guess!
通常，我会删除这个微不足道的问题，但是看到我犯了这个错误，其他人将来可能会这样做，而且很少有人指出我的解决方案.因此，我会继续保留它，以帮助将来使用同样密集的开发人员进行 Google 搜索！
Normally, I would delete the question for something this trivial, but seeing as I made this mistake, others probably will in the future, and there was very little out there to point me to the solution. So I will keep it up to aid in the future googling of similarly dense developers!
这篇关于添加 :multipart =>true 抛出未定义的方法 &quot;name&quot;错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
