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In order to get a cache sweeper to actually do anything when it is triggered, it must be called from a controller, and that controller must be instantiated though a http request.
This is what I have learned from trying to expire fragment cache from background scripts in Ruby om Rails. It simply is not possible. [...]

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So i’ve been spending hours tracking this one down: I wanted to have cache sweepers in rails and followed the advice from railscasts and railsevny. Those tutorials tell you to put sweepers in an app/sweepers directory and add that directory to your load path. DON’T DO THAT. That simply did not work for me (using [...]

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