undefined class/module X in Rails 3 despite requiring models in initializer - ruby-on-rails

Question

We use Rails.cache and see an undefined class/module X error when loading pages that invoke class X. We followed the suggestion here to include an initializer that requires all models in the dev environment.
However, we see the same error. Any other suggestions? We included the initializer code below, and from the output to the console, it appears like the code is getting invoked.
We're on Rails 3.2.12 + Ruby 1.9.3.
if Rails.env == "development"
Dir.foreach("#{Rails.root}/app/models") do |model_name|
puts "REQUIRING DEPENDENCY: #{model_name}"
require_dependency model_name unless model_name == "." || model_name == ".."
end
end
Stack trace:
Processing by DandyController#get_apps as JSON
Parameters: {"category"=>"featured", "country_id"=>"143441", "language_id"=>"EN"}
WARNING: Can't verify CSRF token authenticity
Completed 500 Internal Server Error in 2ms
ArgumentError (undefined class/module App):
app/controllers/dandy_controller.rb:66:in `get_featured_apps'
app/controllers/dandy_controller.rb:50:in `get_apps'
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/templat
es/rescues/_trace.erb (2.0ms)
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/templat
es/rescues/_request_and_response.erb (2.0ms)
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/templat
es/rescues/diagnostics.erb within rescues/layout (46.0ms)
Code:
def get_featured_apps( country_id )
# Fetch featured apps from cache or from DB
apps = Rails.cache.fetch( 'featured_apps', {:expires_in => 1.days} ) do
logger.info '+++ Cache miss: featured apps'
get_featured_apps_helper country_id
end
# Get sponsored results
apps = get_featured_apps_helper country_id
# Return featured apps
return apps
end

Answer 1

I've overwritten the fetch method which worked wonders for me!
unless Rails.env.production?
module ActiveSupport
module Cache
class Store
def fetch(name, options = nil)
if block_given?
yield
end
end
end
end
end
end

Answer 2

A more elegant solution is to write a wrapper method you can call around your call to Rails.cache.fetch:
def some_func
apps = with_autoload_of(App) do
Rails.cache.fetch( 'featured_apps', {:expires_in => 1.days} ) do
logger.info '+++ Cache miss: featured apps'
get_featured_apps_helper country_id
end
end
end
##
# A simple wrapper around a block that requires the provided class to be
# auto-loaded prior to execution.
#
# This method must be passed a block, which it always yields to.
#
# This is typically used to wrap `Rails.cache.fetch` calls to ensure that
# the autoloader has loaded any class that's about to be referenced.
#
# #param [Class] clazz
# The class to ensure gets autoloaded.
#
def self.with_autoload_of(clazz)
yield
end