Rails.cache.fetch is feeding / fetching cache in s

Question

I want to test my caching behavior, and something along these lines fails:

  context "without cache" do

    it "should return the appropriate result, computing it every time", :caching => false do
      p ActionController::Base.perform_caching
      Object.should_receive(:where).exactly(4).and_call_original
      result1 = SomeService.action(args1, args2)
      result2 = SomeService.action(args1, args2)
    end

  end

...even though false is printed out for the ActionController::Base.perform_caching. [This is disabled by the :caching => false option of the bloc (I use a hook)]

If I totally shut down caching by switching from the default :memory_store to the :null_store for the testing environment, the test passes as expected. I just add this line in test.rb:

config.cache_store = :null_store

My action method uses the core caching from Rails:

def action(args1, args2):
...
  objects = Rails.cache.fetch(cache_key, expires_in: 5.days) do
    object.where(id: args1).where(charac: args2).includes(...).to_a
  end
...
end

Answer 1

As a matter of fact, ActionController::Base.perform_caching nor its counterpart config.action_controller.perform_caching is meant to control low level caching.

I submitted an issue+PR to change the docs that can be very misleading.