# Mysterious Rails Crashes **URL:** \ **Category:** Rails\ **Created:** [December 6, 2007, 9:27pm UTC](https://www.ruby-forum.com/t/mysterious-rails-crashes/122351 "2007-12-06T21:27:35Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![emmett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/f0a364/32.png) [@emmett](https://www.ruby-forum.com/u/emmett)\ **Post date:** [December 6, 2007, 9:27pm UTC](https://www.ruby-forum.com/t/mysterious-rails-crashes/122351/1 "2007-12-06T21:27:35Z")
Whenever an exception is thrown (and not caught) during rendering in my Rails application, Rails dies immediately with no stack trace or error screen. The symptom is, from the outside, “pages with errors look blank white”, but I’m pretty sure that’s just what you see when a connection is closed and no response has been sent from the server. Does anyone have any idea what could be causing this, or how to find out? I have replicated it running Rails under Mongrel, lighttpd/fastcgi, and webrick (even in debug mode), all with exactly the same results - no information, no stack traces, just a sudden halt. Thanks, Emmett ---
**Author:** ![emmett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/f0a364/32.png) [@emmett](https://www.ruby-forum.com/u/emmett)\ **Post date:** [December 6, 2007, 9:31pm UTC](https://www.ruby-forum.com/t/mysterious-rails-crashes/122351/2 "2007-12-06T21:31:08Z")
What’s in your development.log? On Dec 6, 1:27 pm, Emmett S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![emmett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/f0a364/32.png) [@emmett](https://www.ruby-forum.com/u/emmett)\ **Post date:** [December 6, 2007, 9:32pm UTC](https://www.ruby-forum.com/t/mysterious-rails-crashes/122351/3 "2007-12-06T21:32:45Z")
Matt W. wrote: > What’s in your development.log? > > On Dec 6, 1:27 pm, Emmett S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) I have a reduced test case: a layoutless render of a template containing “\<% raise ‘foo’ %\>” This is what the log looks like: Processing LiveController#errorer (for 127.0.0.1 at 2007-12-06 11:52:49) [GET] Session ID: 85a4ebcc60791ecbb58db428ef191a66 Parameters: {“action”=\>“errorer”, “controller”=\>“live”} User Load Including Associations (0.074950) SELECT users.“id” AS t0\_r0, users.“login” AS t0\_r1, users.“password\_hash” AS t0\_r2, users.“stream\_key” AS t0\_r3, users.“viewer\_karma” AS t0\_r4, users.“publisher\_karma” AS t0\_r5, users.“updated\_on” AS t0\_r6, users.“created\_on” AS t0\_r7, users.“fans\_count” AS t0\_r8, users.“dmca\_violation” AS t0\_r9, users.“terms\_of\_service\_violation” AS t0\_r10, user\_properties.“id” AS t1\_r0, user\_properties.“user\_id” AS t1\_r1, user\_properties.“name” AS t1\_r2, user\_properties.“kind” AS t1\_r3, user\_properties.“val” AS t1\_r4 FROM users LEFT OUTER JOIN user\_properties ON user\_properties.user\_id = users.id WHERE (name = ‘persistent\_cookie’ and val = ‘emmett|f91c80c4b2e1590e98092cca54d514ba6127c57c|Wed Dec 19 12:08:25 -0800 2007’) MemCache get (0.012725) Rendering live/errorer …it just cuts off there. ---
**Author:** ![emmett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/f0a364/32.png) [@emmett](https://www.ruby-forum.com/u/emmett)\ **Post date:** [December 7, 2007, 3:53am UTC](https://www.ruby-forum.com/t/mysterious-rails-crashes/122351/4 "2007-12-07T03:53:35Z")
Array already has a sum method on it (inherited from Enumerable). I wouldn’t recommend over-riding a built-in class’s method unless you know exactly what it does. On Dec 7, 2007 12:55 PM, Emmett S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > – > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). > > > – Ryan B. ---
**Author:** ![emmett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/f0a364/32.png) [@emmett](https://www.ruby-forum.com/u/emmett)\ **Post date:** [December 7, 2007, 3:58am UTC](https://www.ruby-forum.com/t/mysterious-rails-crashes/122351/5 "2007-12-07T03:58:28Z")
$ irb > > [1, 2, 3].sum > > NoMethodError: undefined method `sum’ for [1, 2, 3]:Array > > from (irb):1 Maybe I have a different version of Ruby? $ ruby -v ruby 1.8.6 (2007-03-13 patchlevel 0) [i686-darwin8.9.1] That’s why I added it…Array#sum didn’t seem to exist. Did it appear in some other version of ruby? Emmett ---
**Author:** ![emmett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/f0a364/32.png) [@emmett](https://www.ruby-forum.com/u/emmett)\ **Post date:** [December 7, 2007, 3:25am UTC](https://www.ruby-forum.com/t/mysterious-rails-crashes/122351/6 "2007-12-07T03:25:53Z")
I figured it out! I had extended class Array with a sum method; apparently Rails does not like that for some reason, because once I renamed it sum\_all there was no problem. Sorry to have bothered everyone. Emmett ---
**Author:** ![emmett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/f0a364/32.png) [@emmett](https://www.ruby-forum.com/u/emmett)\ **Post date:** [December 7, 2007, 4:05am UTC](https://www.ruby-forum.com/t/mysterious-rails-crashes/122351/7 "2007-12-07T04:05:45Z")
Bingo. Rails adds it’s own Array#sum, and adding mine must be causing a conflict. That’s what I get for treating Rails like Ruby… 😛 Thanks, I understand what’s going on now. Emmett ---
**Author:** ![emmett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/f0a364/32.png) [@emmett](https://www.ruby-forum.com/u/emmett)\ **Post date:** [December 7, 2007, 4:03am UTC](https://www.ruby-forum.com/t/mysterious-rails-crashes/122351/8 "2007-12-07T04:03:31Z")
I think it might be added in rails? Try script/console. On Dec 7, 2007 1:28 PM, Emmett S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > – Ryan B. ---
**Author:** ![emmett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/f0a364/32.png) [@emmett](https://www.ruby-forum.com/u/emmett)\ **Post date:** [December 7, 2007, 5:02pm UTC](https://www.ruby-forum.com/t/mysterious-rails-crashes/122351/9 "2007-12-07T17:02:38Z")
ActiveRecord adds its own Array#sum (it might actually be on Enumerable–this is from 6mo memory) that takes an additional parameter. If you define it in the obvious was, kaboom!, but if you don’t define it yourself the one they provide works fine. –MarkusQ Sent via BlackBerry from T-Mobile