If infer_extension is true, the cache path extension is looked up from the request's path & format. This is desirable when reading and writing the cache, but not when expiring the cache - expire_action should expire the same files regardless of the request format.
# File lib/action_controller/caching/actions.rb, line 166 def initialize(controller, options = {}, infer_extension = true) if infer_extension @extension = controller.params[:format] options.reverse_merge!(:format => @extension) if options.is_a?(Hash) end path = controller.url_for(options).split(%{://}).last @path = normalize!(path) end
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