StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POAdding :multipart => true throws Undefined Method "name" error
primarykey
Id
7055074
data
AcceptedAnswerId
7058000
AnswerCount
4
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2011-08-14T04:49:50.197
FavoriteCount
0
LastActivityDate
2013-03-13T14:22:03.740
LastEditDate
2011-08-14T05:01:35.733
LastEditorUserId
381443
OwnerUserId
381443
ParentId
0
PostTypeId
1
Score
2
ViewCount
7001
LastEditorDisplayName
text
Body
I'm drawing a blank on this one. Here's my problem: Short Version My <code>image#create</code> action is failing on the <code>image.save</code> call and throwing <code>Undefined method "name" for nil:NilClass</code>. The Image model includes a file upload via <code>paperclip</code> gem. The part that is throwing me: the error only occurs when I include <code>:multipart => true</code> 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 <code>Image</code> 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: <ul> <li>I'm using <a href="https://github.com/thoughtbot/paperclip" rel="nofollow">paperclip</a> and attempting to store via S3, although this problem still occurs when I completely comment out the <code>has_attached_file</code> line in my Image model.</li> <li>Image is a nested resource inside Collection, which is referenced by a slug in its <code>to_param</code> method.</li> <li>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). </li> </ul> Parameters passed to controller <pre><code>{"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"} </code></pre> Full stack trace <pre><code>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 '<<' /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' activerecord (3.0.9) lib/active_record/connection_adapters/abstract/quoting.rb:34:in '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 'quote' arel (2.0.10) lib/arel/visitors/to_sql.rb:70:in 'block in visit_Arel_Nodes_Values' arel (2.0.10) lib/arel/visitors/to_sql.rb:69:in 'map' arel (2.0.10) lib/arel/visitors/to_sql.rb:69:in 'visit_Arel_Nodes_Values' arel (2.0.10) lib/arel/visitors/visitor.rb:15:in 'visit' arel (2.0.10) lib/arel/visitors/to_sql.rb:59:in 'visit_Arel_Nodes_InsertStatement' arel (2.0.10) lib/arel/visitors/visitor.rb:15:in 'visit' arel (2.0.10) lib/arel/visitors/visitor.rb:5:in 'accept' arel (2.0.10) lib/arel/visitors/to_sql.rb:18:in '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:in 'accept' arel (2.0.10) lib/arel/tree_manager.rb:20:in 'to_sql' arel (2.0.10) lib/arel/select_manager.rb:217:in '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:in 'block in create' activesupport (3.0.9) lib/active_support/callbacks.rb:414:in '_run_create_callbacks' activerecord (3.0.9) lib/active_record/callbacks.rb:277:in 'create' activerecord (3.0.9) lib/active_record/persistence.rb:250:in '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:in 'create_or_update' activerecord (3.0.9) lib/active_record/persistence.rb:40:in 'save' activerecord (3.0.9) lib/active_record/validations.rb:43:in 'save' activerecord (3.0.9) lib/active_record/attribute_methods/dirty.rb:21:in 'save' activerecord (3.0.9) lib/active_record/transactions.rb:240:in 'block (2 levels) in save' activerecord (3.0.9) lib/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:139:in 'transaction' activerecord (3.0.9) lib/active_record/transactions.rb:207:in 'transaction' activerecord (3.0.9) lib/active_record/transactions.rb:290:in '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: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' 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:in 'retrieve_response_from_mimes' actionpack (3.0.9) lib/action_controller/metal/mime_responds.rb:191:in 'respond_to' app/controllers/images_controller.rb:40:in 'create' actionpack (3.0.9) lib/action_controller/metal/implicit_render.rb:4:in 'send_action' actionpack (3.0.9) lib/abstract_controller/base.rb:150:in 'process_action' actionpack (3.0.9) lib/action_controller/metal/rendering.rb:11:in 'process_action' actionpack (3.0.9) lib/abstract_controller/callbacks.rb:18:in '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:in '_run_process_action_callbacks' activesupport (3.0.9) lib/active_support/callbacks.rb:94:in '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:in 'block in process_action' activesupport (3.0.9) lib/active_support/notifications.rb:52:in 'block in instrument' activesupport (3.0.9) lib/active_support/notifications/instrumenter.rb:21:in 'instrument' 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:in 'process_action' actionpack (3.0.9) lib/abstract_controller/base.rb:119:in 'process' actionpack (3.0.9) lib/abstract_controller/rendering.rb:41:in 'process' actionpack (3.0.9) lib/action_controller/metal.rb:138:in 'dispatch' actionpack (3.0.9) lib/action_controller/metal/rack_delegation.rb:14:in 'dispatch' actionpack (3.0.9) lib/action_controller/metal.rb:178:in 'block in action' 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:in 'call' rack-mount (0.6.14) lib/rack/mount/route_set.rb:148:in 'block in call' rack-mount (0.6.14) lib/rack/mount/code_generation.rb:93:in 'block in recognize' rack-mount (0.6.14) lib/rack/mount/code_generation.rb:68:in 'optimized_each' rack-mount (0.6.14) lib/rack/mount/code_generation.rb:92:in 'recognize' rack-mount (0.6.14) lib/rack/mount/route_set.rb:139:in 'call' actionpack (3.0.9) lib/action_dispatch/routing/route_set.rb:493:in 'call' warden (1.0.5) lib/warden/manager.rb:35:in 'block in call' warden (1.0.5) lib/warden/manager.rb:34:in 'catch' warden (1.0.5) lib/warden/manager.rb:34:in 'call' actionpack (3.0.9) lib/action_dispatch/middleware/best_standards_support.rb:17:in 'call' actionpack (3.0.9) lib/action_dispatch/middleware/head.rb:14:in 'call' rack (1.2.3) lib/rack/methodoverride.rb:24:in 'call' actionpack (3.0.9) lib/action_dispatch/middleware/params_parser.rb:21:in 'call' actionpack (3.0.9) lib/action_dispatch/middleware/flash.rb:182:in 'call' actionpack (3.0.9) lib/action_dispatch/middleware/session/abstract_store.rb:149:in 'call' 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:in 'cache' activerecord (3.0.9) lib/active_record/query_cache.rb:12:in 'cache' activerecord (3.0.9) lib/active_record/query_cache.rb:31:in 'call' activerecord (3.0.9) lib/active_record/connection_adapters/abstract/connection_pool.rb:354:in 'call' actionpack (3.0.9) lib/action_dispatch/middleware/callbacks.rb:46:in 'block in call' activesupport (3.0.9) lib/active_support/callbacks.rb:416:in '_run_call_callbacks' actionpack (3.0.9) lib/action_dispatch/middleware/callbacks.rb:44:in 'call' rack (1.2.3) lib/rack/sendfile.rb:107:in 'call' 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:in 'call' rack (1.2.3) lib/rack/runtime.rb:17:in 'call' activesupport (3.0.9) lib/active_support/cache/strategy/local_cache.rb:72:in 'call' rack (1.2.3) lib/rack/lock.rb:11:in 'block in call' <internal:prelude>:10:in 'synchronize' rack (1.2.3) lib/rack/lock.rb:11:in 'call' actionpack (3.0.9) lib/action_dispatch/middleware/static.rb:30:in 'call' railties (3.0.9) lib/rails/application.rb:168:in 'call' railties (3.0.9) lib/rails/application.rb:77:in 'method_missing' railties (3.0.9) lib/rails/rack/log_tailer.rb:14:in 'call' rack (1.2.3) lib/rack/content_length.rb:13:in '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' </code></pre> <h1>Update</h1> As requested, model code: <pre><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 </code></pre> <h1>Update 2</h1> I compared the <code>Image</code> instance that was built with <code>:multipart => true</code> vs without it, and confirmed the only difference is the file upload field, <code>picture_file_name</code>. Without <code>:multipart => true</code>, it a string with the filename (not surprising). With it, it is an instance of <code>ActionDispatch::Http::UploadedFile</code>. Given that the stack trace shows its failing during a <code>to_yaml</code> call, perhaps the problem lies with the <code>UploadedFile</code> instance converting to YAML?
Tags
<ruby-on-rails><file-upload><paperclip>
Title
Adding :multipart => true throws Undefined Method "name" error
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USDave W.
UserOwnerUserId
1. USDave W.
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
2. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
3. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
3. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POAdding :multipart => true throws Undefined Method "name" error
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId
1. COAdd your model code to the question.
 singulars
 PostPostId
 POAdding :multipart => true throws Undefined Method "name" error
 UserUserId
 USMaurício Linhares

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.