# Non-repeatable "undefined error 'path'" error **URL:** \ **Category:** Rails\ **Created:** [April 25, 2009, 10:39pm UTC](https://www.ruby-forum.com/t/non-repeatable-undefined-error-path-error/166479 "2009-04-25T22:39:34Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![ricklach](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/47e85d/32.png) [@ricklach](https://www.ruby-forum.com/u/ricklach)\ **Post date:** [April 25, 2009, 10:39pm UTC](https://www.ruby-forum.com/t/non-repeatable-undefined-error-path-error/166479/1 "2009-04-25T22:39:34Z")
I’m seeing an error the first time I run a create after restarting my webserver (thin). Same create succeeds on all following attempts. Details: ruby 1.9.2dev rails 2.3.2 rack 0.9.1 thin 1.0.0 rmagick 2.9.1 I’m trying to get attachment\_fu working in my current setup and have run into a rather strange situation. The first image I try to load produces the following diag in the logfile: * * * Processing ApplicationController#create (for 127.0.0.1 at 2009-04-25 09:50:27) [POST] Parameters: {“authenticity\_token”=\>“EjZpcSwOswNpjZCHHhypx/ LdfR8m0AmW1Z2caF4/BVI=”, “mugshot”=\>{“uploaded\_data”=\>#\}, “commit”=\>“Create”} ## NameError (undefined method `path' for class`ActionController::UploadedStringIO’): internal:prelude:8:in `synchronize' thin (1.0.0) lib/thin/connection.rb:63:in`pre\_process’ thin (1.0.0) lib/thin/connection.rb:54:in `process' thin (1.0.0) lib/thin/connection.rb:39:in`receive\_data’ eventmachine (0.12.6) lib/eventmachine.rb:240:in `run_machine' eventmachine (0.12.6) lib/eventmachine.rb:240:in`run’ thin (1.0.0) lib/thin/backends/base.rb:57:in `start' thin (1.0.0) lib/thin/server.rb:150:in`start’ If I then simply reissue the request from the browser the create action succeeds. From that point on, all attempts to follow the new- > create sequence succeed first try. Out of curiosity, I tried the same with a new webrick in place of thin. In that case the first attempt produces: * * * Processing ApplicationController#create (for ::1 at 2009-04-25 10:20:30) [POST] Parameters: {“authenticity\_token”=\>“EjZpcSwOswNpjZCHHhypx/ LdfR8m0AmW1Z2caF4/BVI=”, “mugshot”=\>{“uploaded\_data”=\>#\}, “commit”=\>“Create”} ## NameError (undefined method `path' for class`ActionController::UploadedStringIO’): internal:prelude:8:in `synchronize' /opt/RoR/lib/ruby/1.9.1/webrick/httpserver.rb:111:in`service’ /opt/RoR/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run' /opt/RoR/lib/ruby/1.9.1/webrick/server.rb:183:in`block in start\_thread’ The browser retry yields a “Webrick - stopped (abort trap)” so no further attemps are possible. Ignoring for a momemt the different ways the two servers handle the error allows me to focus on the common: * * * ## NameError (undef…‘path’…‘Act…::UploadedStringIO’) internal:prelude:8:in `synchronize’ Unfortunately, that’s as far as I can get. I’m clueless on how to resolve the ‘synchronize’ reference. There’s obviously a point in the sequence (?rack?) that is not correctly dealing with the initialization. The fact that thin will allow a do-over is fortunate for me because it lets me believe the problem isn’t in my code (for a change;-). Actually it’s not my code but the trivial “mugshots” example that can be found through attachment\_fu/README. But, in the interest of full disclosure: ## from mugshots\_controller.rb def new @mugshot = Mugshot.new end ## def create @mugshot = Mugshot.new(params[:mugshot]) logger.info “Mugshot attributes hash: # {@mugshot.attributes.inspect}” logger.info “Mugshots\_url: #{mugshots\_url.inspect}” if @mugshot.save flash[:notice] = ‘Mugshot was successfully created.’ redirect\_to mugshots\_url else render :action =\> :new end end ## from mugshots/new.html.erb \<%= error\_messages\_for :mugshot %\> \<% form\_for(:mugshot, :url =\> mugshots\_path, :html =\> { :multipart =\> true }) do |f| -%\> Upload A Mugshot: \<%= f.file\_field :uploaded\_data %\> \<%= submit\_tag 'Create' %\> \<% end -%\> -------------------------- thanks in advance, rick ---
**Author:** ![ricklach](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/47e85d/32.png) [@ricklach](https://www.ruby-forum.com/u/ricklach)\ **Post date:** [April 26, 2009, 1:22am UTC](https://www.ruby-forum.com/t/non-repeatable-undefined-error-path-error/166479/2 "2009-04-26T01:22:07Z")
I think it’s a bit too early to run all that stuff on 1.9.2. Dmitry ---
**Author:** ![ricklach](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/47e85d/32.png) [@ricklach](https://www.ruby-forum.com/u/ricklach)\ **Post date:** [April 26, 2009, 6:28am UTC](https://www.ruby-forum.com/t/non-repeatable-undefined-error-path-error/166479/3 "2009-04-26T06:28:34Z")
certainly a valid reply, not exactly what I was expecting though… On Apr 25, 1:21 pm, Dmitry S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)