ruby on rails - How do I debug an error in a gem? -


i'm getting error paperclip gem.

nomethoderror (you have nil object when didn't expect it! might have expected instance of array. error occurred while evaluating nil.size):   paperclip (2.3.8) lib/paperclip/attachment.rb:104:in `assign'

how can debug this, seeing though it's in gem? if code place few puts see what's going on, can't here. i'm using rails 3.0.1

here's best shot.

  • open 1 of controllers , add debugger line it. need debugger kick in set breakpoint
  • next run rails --debug
  • navigate page / controller breakpoint
  • the debugger console appear.
  • run gem.find_files("attachment.rb") <- i'll call $gem_root path returns
  • run list $gem_root/lib/paperclip/attachment.rb:104 - show code around area error occurred.
  • run b $gem_root/lib/paperclip/attachment.rb:$line - replace $line candidate breakpoint.
  • run cont
  • hit page / action causes error, , debug console should open @ break point.

i think there must way path gem file programmatically, have no idea how :(


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