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#4427 ✓resolved
Karl Alexandre

Strange behaviour in exception display

Reported by Karl Alexandre | April 17th, 2010 @ 09:47 AM | in 3.0.2

I spent a bunch of time tracking a strange baheviour in Rails 3 exception display. The problem doesn't show up in 2.3.5.
Here it is:

Step 1: Context

app/controllers/subitems_controller.rb

class SubitemsController < ApplicationController
  def index
    @subitems = Item.first.subitems
  end
end

app/views/subitems/index.html.erb

<%= @subitems %>
<%= Boum.new %>

result

As expected, this renders Action Controller: Exception caught in the browser with the following message uninitialized constant ActionView::CompiledTemplates::Boum, fine.

Step 2: Not displaying subitems

app/controllers/subitems_controller.rb

class SubitemsController < ApplicationController
  def index
    @subitems = Item.first.subitems
  end
end

app/views/subitems/index.html.erb

<%= Boum.new %>

result

This renders 500 Internal Server Error, weird.

Step 3: Getting sibitems directly, instead of going through the item has_many subitems association

app/controllers/subitems_controller.rb

class SubitemsController < ApplicationController
  def index
    @subitems = Subitem.all
  end
end

app/views/subitems/index.html.erb

<%= Boum.new %>

h4. result
Things back to normal: the exception is rendered correctly in the browser.

h3. Test configuration

OS X 10.5.8
Rails 3.0.0.beta3
Both 1.8.7 p249 & 1.9.1 p378

Am I wrong, or is it an unexpected behaviour?

PS
Sample app attached (in step1 state, rake db:migrate / rake db:seed).

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