Best way to create views based on a theme

I need to create separate view pages for a controller that I have.

I have a CustomerController that, based on the customer I need to create custom pages, these pages have to be stored as a file not from the db.

So normally I would have this:

class CustomerController < ApplicationController
def show
@customer = Customer.find(param["id"])
end
end


And the views would be located at:

/views/customer/show.html.erb


What I want to do is have the view pages like:

/views/customer/1/show.html.erb
/views/customer/2/show.html.erb
/views/customer/3/show.html.erb


How can I reference the specific view pages to load from within the action?
Is there a way to just pass the value 1,2,3 to the view folder path?

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