I was frustrated to learn that fresh_when() doesn't support Enumerable. Since I would think that the bulk of the ETag savings would be on large index actions, rather than individual show actions, I wrote a quick-and-dirty helper for application_controller.rb that I thought others might find helpful, too.
# Handle conditional rendering for a single collection. Depends on # unique IDs, so will not work with data from more than one model at a # time. def fresh_collection? collection id_array = collection.each { |c| id_array << c.id } id_array.sort! fresh_when etag: id_array, public: true end
There's probably a better way to do this, especially if you have an index action that's pulling data from multiple models, but this was enough to scratch my immediate itch. Does anyone know of a better solution?