YARB

Processing MessagingController#inbox (for 192.168.1.100 at 2008-01-19 11:02:45) [GET]
  Session ID: 17db90c03c03ebfee0c3ae4198900706
  Parameters: {"action"=>"inbox", "controller"=>"messaging"}
/!\ FAILSAFE /!\  Sat Jan 19 11:02:45 MST 2008
  Status: 500 Internal Server Error
  wrong number of arguments (1 for 0)

Chances are you just added a method “send” or similar to your rails app:

class MessagingController < AuthenticatedController
  def send
  end
end

This would, of course, override ruby’s default “send” behavior (an integral part of ruby, and rails).

Hat tip, Justin Ball – thx!

This was a tricky error to debug because it was only seen sporadically. Eventually we saw that the exception was, generally, only happening when users were uploading large files. (10mb or above)

I’m still not sure as to the root cause of the problem. I suspect it has to do with the combination of plugins we are running (including filecolumn). If this was happening in vanilla Rails it would be a serious bug that the core team would’ve addressed by now.

First I was able to consistently repo the issue by uploading a 10mb file as an attachment. If you don’t have any lying around I found some test files here at cachefly.

The problem occurs when these file data objects (class Tempfile) are left in the params hash for the next session. Clearing out the Tempfile from the params hash prevents this.

What I’ve got now in application.rb:

  after_filter  :clear_filedata_params

  def clear_filedata_params
    params.each_pair do |k, v|
      params.delete(k) if v.is_a?(Tempfile) || v.is_a?(File)
    end
  end
  helper_method :clear_filedata_params

So from now on, if you’re passing a file data object as a root param, i.e. {:file_data => #File<...>}, this will automatically be cleared from params and should work ok.

If you pass it in as, {:foo => {:file_data => #File<...>}}, you’ll need to clear it out manually, since the after_filter won’t catch it. (Or if you know how to flatten a Ruby Hash easily, let me know!) In this case you could simply do a “params.delete(:foo)”.

TypeError (singleton can't be dumped):
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/session/active_record_store.rb:83:in `dump'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/session/active_record_store.rb:83:in `marshal'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/session/active_record_store.rb:137:in `marshal_data!'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/callbacks.rb:333:in `send'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/callbacks.rb:333:in `callback'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/callbacks.rb:330:in `each'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/callbacks.rb:330:in `callback'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/callbacks.rb:241:in `create_or_update'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1545:in `save_without_validation'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/validations.rb:752:in `save_without_transactions'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/transactions.rb:129:in `save'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/connection_adapters/abstract/database_statements.rb:59:in `transaction'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/transactions.rb:95:in `transaction'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/transactions.rb:121:in `transaction'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/transactions.rb:129:in `save'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/session/active_record_store.rb:311:in `update'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:867:in `silence'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/session/active_record_store.rb:311:in `update'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/session/active_record_store.rb:318:in `close'
    /usr/local/lib/ruby/1.8/cgi/session.rb:324:in `close'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/base.rb:1184:in `close_session'
    /usr/local/l