I have docker running an app container (rails app) and a db container running postgres

I have volume mounted my local working directory to my app container so I can work locally and the changes reflected in the app container.

In doing this everything seems to work fine except I seem to get some strange caching behaviour on my controllers

for example

route:

get '/something', to: 'something#show'

controller

class SomethingController < ApplicationController
    def show
        render text: "Hello 1"
    end
end

When I go to myapp/something I get Hello 1 perfect!

Then I edit my controller to:

class SomethingController < ApplicationController
    def show
        render text: "Hello 2"
    end
end

When I go to myapp/something I still get Hello 1?

If I return a html view, it updates just fine, so why is my changes in my controller not being reflected?

The only way I can get these changes to reflect is by making a change in my routes file and saving, this seems to refresh whatever is being cached.

note: I am not caching in the browser, I have caching turned off and Im doing a hard reload each time.

Can anyone shed any light on this? Im trying to follow this tutorial: https://www.youtube.com/watch?v=NEdDa3Zqu7s&list=PLbG4OyfwIxjEe5Y3hQCiQjYnSgRH051iJ&index=3

Thanks