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In Rails, a Sweeper isn't getting called in a Model-only setup - Stack Overflow

In Rails, a Sweeper isn’t getting called in a Model-only setup - Stack Overflow

I was looking into this kind of lacked some details.  Here is also another blog post that was quite helpful.

Sweepers require a controller, so cannot be used outside of a request.  If a sweeper is called outside of the controller, all calls to expire_ will be silently ignored.  You do not have to add a sweeper to observers, this is on purpose as the cache_sweeper method used in the controller adds it to the observers and also includes the controller object.

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