Cache sweepers not working since last upgrade

Rails Engines Development
1

Hi all,
I updated Rails to 1.1.1 and engines to 1.1.1.
Since then, my cache sweepers stopped working.
I get this error:
You have a nil object when you didn’t expect it!
The error occured while evaluating nil.controller_name

See end of post for full error trace.

When I move the controller from vendor/plugins/myengine/app/controllers
to app/controllers, everything works fine, so I guess it’s an engine
bug.

Controller:

class TestController < ApplicationController

layout false
helper :admin_pages
model :page_element, :element_sweeper
cache_sweeper :element_sweeper
def test

render :inline=>“blaa”
end
end

Sweeper:

class ElementSweeper < ActionController::Caching::Sweeper
observe PageElement
end

Errors:

NoMethodError (You have a nil object when you didn’t expect it!
The error occured while evaluating nil.controller_name):
/usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/caching.rb:541:in
callback' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/caching.rb:534:inafter’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:227:in
around_filter' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:227:incall’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:401:in
call_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:394:ineach’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:394:in
call_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:389:inafter_action’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:369:in
perform_action_without_benchmark' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:inperform_action_without_rescue’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:in
measure' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:inperform_action_without_rescue’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/rescue.rb:82:in
perform_action' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:381:insend’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:381:in
process_without_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:377:inprocess_without_session_management_support’
/usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/session_management.rb:117:in
process' /usr/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/dispatcher.rb:38:indispatch’
/usr/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:115:in
handle_dispatch' /usr/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:81:inservice’
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in service' /usr/lib/ruby/1.8/webrick/httpserver.rb:65:inrun’
/usr/lib/ruby/1.8/webrick/server.rb:155:in start_thread' /usr/lib/ruby/1.8/webrick/server.rb:144:instart’
/usr/lib/ruby/1.8/webrick/server.rb:144:in start_thread' /usr/lib/ruby/1.8/webrick/server.rb:94:instart’
/usr/lib/ruby/1.8/webrick/server.rb:89:in each' /usr/lib/ruby/1.8/webrick/server.rb:89:instart’
/usr/lib/ruby/1.8/webrick/server.rb:79:in start' /usr/lib/ruby/1.8/webrick/server.rb:79:instart’
/usr/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:67:in
dispatch' /usr/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/servers/webrick.rb:59 /usr/lib/ruby/1.8/rubygems/custom_require.rb:21:inrequire__’
/usr/lib/ruby/1.8/rubygems/custom_require.rb:21:in require' /usr/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:inrequire’
/usr/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/server.rb:30
/usr/lib/ruby/1.8/rubygems/custom_require.rb:21:in require__' /usr/lib/ruby/1.8/rubygems/custom_require.rb:21:inrequire’
/usr/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require’
script/server:3

2

Yeah, I noticed this too. I think it has to do with Rails rather than
Engines… might even be a bug. I noticed in the changelog that the
controller instance variable inside sweepers is set to nil “between
requests”… whatever that means. I figure that’s what’s causing the
error, but I haven’t figured out how to fix it or even looked into
whether its a reported bug. I just have my sweepers turned off for
now. : (

Let me know if you learn anything about this.

On 4/10/06, Martin S. [email protected] wrote:

to app/controllers, everything works fine, so I guess it’s an engine
model :page_element, :element_sweeper
observe PageElement
/usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/caching.rb:534:in
call_filters' /usr/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/rescue.rb:82:in dispatch’
/usr/lib/ruby/1.8/webrick/server.rb:89:in `each’
/usr/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/server.rb:30

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–
Jeff L.
http://blogrium.com/

3

I got this with my app that doesn’t use engines at all:

You have a nil object when you didn’t expect it!
The error occured while evaluating nil.controller_name

I think it has to do with using external libraries, because it seems to
be caused by this… @status_options =
YAML::load(Settings.status_options)

I’m pretty sure this is related to your problem. Interestingly, things
work normally for me when I set config.action_controller.perform_caching
= false in production.rb. Does it do that for you guys too?

Simon.

4

I don’t know about external libraries, but setting perform_caching to
false should be expected to avoid the problem… if you’re not
performing caching, sweepers don’t need to run, which is where the
problem is.

On 4/10/06, sclaret [email protected] wrote:

work normally for me when I set config.action_controller.perform_caching

–
Jeff L.
http://blogrium.com/

5

Jeff L. wrote:

I don’t know about external libraries, but setting perform_caching to
false should be expected to avoid the problem… if you’re not
performing caching, sweepers don’t need to run, which is where the
problem is.

On 4/10/06, sclaret [email protected] wrote:

work normally for me when I set config.action_controller.perform_caching

–
Jeff L.
http://blogrium.com/

actually the sweepers work when I call them from norman (non-engine)
controllers, so the error must be on the engine side