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CacheSweepers and url_for

It appears url_for only seems to work correctly in a CacheSweeper when running a server in production mode. I’ve confirmed this in Rails 2.0.2.

class MySeeper < ActionController::Caching::Sweeper
	observe Item

	def after_create(item)
	   value = url_for(:controller => :items)
	end
end

In development mode, value evaluates to nil. Peculiar indeed …