添加：multipart =>真正的抛出未定义的方法“名称”错误 [英] Adding :multipart => true throws Undefined Method "name" error

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本文介绍了添加：multipart =>真正的抛出未定义的方法“名称”错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我在这一张上留下了一个空白。这是我的问题：

短版 $ b

我的对于nil：NilClass 调用并抛出未定义的方法name / code>。 Image模型包括一个文件上传通过 paperclip gem。



抛出我的部分：



只有当我包含：multipart =>真正的在提交表格



当我把它拿出来，表单完美，除了图像文件doesn' t上传。有关失败的详细信息，请参阅下面的堆栈跟踪。它看起来像试图为INSERT语句引用某些东西时没有任何价值，但我不知道是什么。我的控制器参数看起来不错，我通过记录器检查确保新的 Image 实例在它保存调用之前正确构建。



其他详情



我会尽量包含所有我能想到的细节，




  • 我正在使用回形针并尝试通过S3存储，但是当我完全注释掉我的图像模型中的 has_attached_file 行时，仍然出现这个问题。


  • Image是Collection中的一个嵌套资源，它在 to_param 方法中被一个slug引用。


  • 我有一个多租户系统的基础知识（又名Basecamp风格的用户子域，通过一个集中用户模型来实现所有组件）。


    传递给控制器​​的参数

      {utf8=> - ，
    authenticity_token=" JYCMky7851j5cW4ChSWUCCL / 02iePf6i / QWAgR8q5tE =，
    image => {name=>我的测试图像2，
    slug=>my-测试图像-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\\\
    Content-Type：image / jpeg\r\\\
    ，
     @tempfile =＃< File：/ var / folders / df / mvsv5cs137gbyl8r7h428zp40000gn / T / RackMultipart20110814-64770-duz6wu>>}，
    commit=>Create Image，
    collection_id=>my-收集}

    完整堆栈跟踪 

      activesupport（3.0.9）lib / active_support / whiny_nil.rb：48：'method_missing' 
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:20:in'block in initialize'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in'yield'
     / Users / daw /。 rvm / rubies / ruby​​-1.9.2-p180 / lib / ruby​​ / 1.9.1 / psych / visitors / yaml_tree.rb：22：在'default'
     /Users/daw/.rvm/rubies/ruby- 1.9.2-p180 / lib / ruby​​ / 1.9.1 / psych / visitors / yaml_tree.rb：22：在'block in initialize'
     /Users/daw/.rvm/rubies/ruby-1.9.2- p180 / lib / ruby​​ / 1.9.1 / psych / visitors / yaml_tree.rb：22：在'yield'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/ 1.9.1 / psych / visitors / yaml_tree.rb：22：在'default'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/访客/ yaml_tree.rb：22：在'块中初始化'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree。 RB：22： in'yield'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in'default'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in'block in initialize'
     / Users /daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in'yield'
     /Users/daw/.rvm/ ruby-1.9.2-p180 / lib / ruby​​ / 1.9.1 / psych / visitors / yaml_tree.rb：22：在'default'
     /Users/daw/.rvm/rubies/ruby-1.9。 2-p180 / lib / ruby​​ / 1.9.1 / psych / visitors / yaml_tree.rb：22：在'block in initialize'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/ lib / ruby​​ / 1.9.1 / psych / visitors / yaml_tree.rb：63：在'yield'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9。 1 / psych / visitors / yaml_tree.rb：63：在'default'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/ yaml_tree.rb：63：在'accept'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:325：在'转储块'中_ivars'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:323:in'each'
     /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 /。在'visit_Object'
     /Users/daw/.rvm/rubies/ruby- 1.9.2-p180 / lib / ruby​​ / 1.9.2-p180 / lib / ruby​​ / 1.9.1 / psych / visitors / yaml_tree.rb：63：在'accept'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/ lib / ruby​​ / 1.9.1 / psych / visitors / yaml_tree.rb：36：在'<'
     /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：在'psych_to_yaml'
     activerecord（3.0.9）lib / active_record / connection_adapters / abstract / quoting.rb：34：在'quote'
     activerecord（3.0.9）lib / active_record / connection_adapters /sqlite3_adapter.rb:45:in'quote'
     arel（2.0.10）lib / arel / visitors / to_sql.rb：327：in （2.0.10）lib / arel / visitors / to_sql.rb：70：在'block in visit_Arel_Nodes_Values'
     arel（2.0.10）lib / arel / visitors / to_sql.rb： 69：在'map'
     arel（2.0.10）lib / arel / visitors / to_sql.rb：69：在'visit_Arel_Nodes_Values'
     arel（2.0.10）lib / arel / visitor / visitor。 rb：15：在'visit'
     arel（2.0.10）lib / arel / visitors / to_sql.rb：59：在'visit_Arel_Nodes_InsertStatement'
     arel（2.0.10）lib / arel / visitors / access.rb：15：在'visit'
     arel（2.0.10）lib / arel / visitor / visitor.rb：5：在'accept'
     arel（2.0.10）lib / arel /访客/ to_sql.rb：18：在'block in accept'
     activerecord（3.0.9）lib / active_record / connection_adapters / abstract / connection_pool.rb：111：in'with_connection'
     arel（2.0。 10）lib / arel / visitors / to_sql.rb：16：在'accept'
     arel（2.0.10）lib / arel / tree_manager.rb：20：在'to_sql'
     arel（2.0。 10）lib / arel / select_manager.rb：217：在'insert'
     activerecord（3.0.9）lib / active_record / relation.rb：14：in'insert '
     activerecord（3.0.9）lib / active_record / persistence.rb：274：in'create'
     activerecord（3.0.9）lib / active_record / timestamp.rb：47：in'create'
     activerecord（3.0.9）lib / active_record / callbacks.rb：277：'block in create'
     activesupport（3.0.9）lib / active_support / callbacks.rb：414：'_run_create_callbacks'
     activerecord（3.0.9）lib / active_record / callbacks.rb：277：在'create'
     activerecord（3.0.9）lib / active_record / persistence.rb：250：在'create_or_update'
     activerecord（3.0.9）lib / active_record / callbacks.rb：273：in'block in create_or_update'
     activesupport（3.0.9）lib / active_support / callbacks.rb：429：in'_run_save_callbacks'
     activerecord（3.0.9）lib / active_record / callbacks.rb：273：在'create_or_update'
     activerecord（3.0.9）lib / active_record / persistence.rb：40：'save'
     activerecord （3.0.9）lib / active_record / validations.rb：43：在'save'
     activerecord（3.0.9）lib / active_record / attribute_methods / dirty。 rb：21：在'save'
     activerecord（3.0.9）lib / active_record / transactions.rb：240：在'block（2 levels）in save'
     activerecord（3.0.9）lib /在事务
     activerecord（3.0。）中记录：active_record / transactions.rb：292：in block in with_transaction_returning_status'
     activerecord（3.0.9）lib / active_record / connection_adapters / abstract / database_statements.rb： 9）lib / active_record / transactions.rb：207：在'transaction'
     activerecord（3.0.9）lib / active_record / transactions.rb：290：在'with_transaction_returning_status'
     activerecord（3.0.9） lib / active_record / transactions.rb：240：in'block in save'
     activerecord（3.0.9）lib / active_record / transactions.rb：251：在'rollback_active_record_state！'
     activerecord（3.0.9 ）lib / active_record / transactions.rb：239：'save'
     app / controllers / images_controller.rb：42：'block in create'
     actionpack（3.0.9）lib / action_controller / metal /mime_responds.rb:264:in'call'
     actionpack（3.0.9）lib / action_controller / metal / mime_responds.rb：264：在'retrieve_response_from_mimes'
     actionpack（3.0.9）lib / action_controller / metal / mime_responds.rb：191：在'respond_to'
     app / controllers / images_controller。 rb：40：在'create'
     actionpack（3.0.9）lib / action_controller / metal / implicit_render.rb：4：在'send_action'
     actionpack（3.0.9）lib / abstract_controller / base。 rb：150：在'process_action'
     actionpack（3.0.9）lib / action_controller / metal / rendering.rb：11：在'process_action'
     actionpack（3.0.9）lib / abstract_controller / callbacks。 rb：18：在'block in process_action'
     activesupport（3.0.9）lib / active_support / callbacks.rb：451：in'_run__867212960703161301__process_action__2360218484576085785__callbacks'
     activesupport（3.0.9）lib / active_support / callbacks。 rb：410：在'_run_process_action_callbacks'
     activesupport（3.0.9）lib / active_support / callbacks.rb：94：'run_callbacks'
     actionpack（3.0.9）lib / abstract_controller / callbacks.rb： 17： in'process_action'
     actionpack（3.0.9）lib / action_controller / metal / instrumentation.rb：30：'block in process_action'
     activesupport（3.0.9）lib / active_support / notifications.rb： 52：在'block in instrument'中
     activesupport（3.0.9）lib / active_support / notifications / instrumenter.rb：21：在'instrument'中
     activesupport（3.0.9）lib / active_support / notifications。 rb：52：in'instrument'
     actionpack（3.0.9）lib / action_controller / metal / instrumentation.rb：29：in'process_action'
     actionpack（3.0.9）lib / action_controller / metal / rescue.rb：17：在'process_action'
     actionpack（3.0.9）lib / abstract_controller / base.rb：119：在'process'
     actionpack（3.0.9）lib / abstract_controller / rendering。 rb：41：在'process'
     actionpack（3.0.9）lib / action_controller / metal.rb：138：在'dispatch'
     actionpack（3.0.9）lib / action_controller / metal / rack_delegation。 rb：14：在'dispatch'
     actionpack（3.0.9）lib / action_controller / metal.rb：178：在'block in a 
     actionpack（3.0.9）lib / action_dispatch / routing / route_set.rb：62：in'call'
     actionpack（3.0.9）lib / action_dispatch / routing / route_set.rb：62： in'dispatch'
     actionpack（3.0.9）lib / action_dispatch / routing / route_set.rb：27：'call'
     rack-mount（0.6.14）lib / rack / mount / route_set。 rb：148：'block in call'
     rack-mount（0.6.14）lib / rack / mount / code_generation.rb：93：'block in recognis'
     rack-mount（0.6。 14）lib / rack / mount / code_generation.rb：68：在'optimized_each'
     rack-mount（0.6.14）lib / rack / mount / code_generation.rb：92：在'recognise'
    机架安装（0.6.14）lib / rack / mount / route_set.rb：139：在'call'
     actionpack（3.0.9）lib / action_dispatch / routing / route_set.rb：493：in'call' 
     warden（1.0.5）lib / warden / manager.rb：35：'block in call'
     warden（1.0.5）lib / warden / manager.rb：34：'catch' 
     warden（1.0.5）lib / warden / manager.rb：34：在'call'
     actionpack（3.0.9）lib / action_dispatch / middleware / best_sta ndards_support.rb：17：在'call'
     actionpack（3.0.9）lib / action_dispatch / middleware / head.rb：14：在'call'
     rack（1.2.3）lib / rack / methodoverride.rb：24：in'call'
     actionpack（3.0.9）lib / action_dispatch / middleware / params_parser.rb：21：'call'
     actionpack（3.0.9）lib / action_dispatch /中间件/ flash.rb：182：在'call'
     actionpack（3.0.9）lib / action_dispatch / middleware / session / abstract_store.rb：149：在'call'中
     actionpack（3.0.9） lib / action_dispatch / middleware / cookies.rb：302：in'call'
     activerecord（3.0.9）lib / active_record / query_cache.rb：32：in block in call'
     activerecord（3.0。 9）lib / active_record / connection_adapters / abstract / query_cache.rb：28：'cache'
     activerecord（3.0.9）lib / active_record / query_cache.rb：12：'cache'
     activerecord 3.0.9）lib / active_record / query_cache.rb：31：在'call'
     activerecord（3.0.9）lib / active_record / connection_adapters / abstract / connection_pool.rb：354：in'call'
     ActionPack的（3.0.9）lib / action_dispatch / middleware / callbacks.rb：46：'block in call'
     activesupport（3.0.9）lib / active_support / callbacks.rb：416：'_run_call_callbacks'
     actionpack（3.0.9）lib / action_dispatch / middleware / callbacks.rb：44：'call'
     rack（1.2.3）lib / rack / sendfile.rb：107：在'call'中
     actionpack（3.0.9）lib / action_dispatch / middleware / remote_ip.rb：48：in'call'
     actionpack（3.0.9）lib / action_dispatch / middleware / show_exceptions.rb：47：in'call'
     railties（3.0.9）lib / rails / rack / logger.rb：13：在'call'
     rack（1.2.3）lib / rack / runtime.rb：17：在'call'
     activesupport（3.0.9）lib / active_support / cache / strategy / local_cache.rb：72：在'call'中
     rack（1.2.3）lib / rack / lock.rb：11'in block 
    < internal：prelude>：10：in'synchronize'
     rack（1.2.3）lib / rack / lock.rb：11：'call'
     actionpack 3.0.9）lib / action_dispatch / middleware / static.rb：30：在'call'
     railties（3.0.9）lib / rails / application.rb：168 ：in'call'
     railties（3.0.9）lib / rails / application.rb：77：'method_missing'
     railties（3.0.9）lib / rails / rack / log_tailer.rb：14 ：在'call'
     rack（1.2.3）lib / rack / content_length.rb：13：在'call'
     rack（1.2.3）lib / rack / handler / webrick.rb：52 ：in'service'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/httpserver.rb:111:in'service'
     /Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/httpserver.rb:70:in'run'
     /Users/daw/.rvm /rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/webrick/server.rb:183:in'block in start_thread'



    更新



    根据要求，模型代码：

      class Image< ActiveRecord :: Base 
     belongs_to：collection 
     belongs_to：user 
     
    efore_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



    我比较了使用：multipart =>构建的 Image true vs没有它，并确认唯一的区别是文件上传字段， picture_file_name 。没有：multipart =>真正的，它是一个字符串与文件名（不奇怪）。有了它，它是一个 ActionDispatch :: Http :: UploadedFile 的实例。鉴于堆栈跟踪在 to_yaml 调用期间显示失败，可能问题在于将 UploadedFile 实例转换为YAML解决方案

那么，我终于通过记录器的输出来追溯到ActiveRecord源代码。原来，我怀疑是没有保存 UploadedFile ，因为它无法将其转换为YAML。



<但是，这是因为我的一个愚蠢的错误。在我的提交表格中，我有：

 <％= f.file_field：picture_file_name％>

当它应该是： 

 <％= f.file_field：picture％>

paperclip gem理解：图片是上传的文件，并使用背景魔法将文件名保存到适当的字段。我只是低估了我使用的易用性！



通常情况下，我会删除这个微不足道的问题，但是看到我犯了这个错误，其他人可能会在未来，而且那里很少指向我的解决方案。因此，我会继续努力，以帮助未来Google开发人员的搜索引擎！

I'm drawing a blank on this one. Here's my problem:

Short Version

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.

The part that is throwing me:

the error only occurs when I include :multipart => true on the submitting form

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.

Extra Details

I'll try to include all the details I can think of, ordered by importance:

  • I'm using paperclip and attempting to store via S3, although this problem still occurs when I completely comment out the has_attached_file line in my Image model.

  • Image is a nested resource inside Collection, which is referenced by a slug in its to_param method.

  • 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).

Parameters passed to controller

{"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"}

Full stack trace

activesupport (3.0.9) lib/active_support/whiny_nil.rb:48:in 'method_missing'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:20:in 'block in initialize'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'yield'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'default'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'block in initialize'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'yield'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'default'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'block in initialize'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'yield'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'default'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'block in initialize'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'yield'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'default'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:22:in 'block in initialize'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:63:in 'yield'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:63:in 'default'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:63:in 'accept'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:325:in 'block in dump_ivars'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:323:in 'each'
/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'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:63:in 'accept'
/Users/daw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:36:in '<<'
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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

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?

解决方案

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.

However, this because of a stupid mistake on my part. In my submitting form, I had:

<%= f.file_field :picture_file_name %>

When it should have been:

<%= f.file_field :picture %>

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!

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 =&gt;真正的抛出未定义的方法“名称”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！

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