domain_concepts.rb

module DomainConcepts
  def self.prepended(base)
    base.class_eval do
      before_action :set_view_paths
    end
  end

  %i(index show edit new).each do |a|
    define_method a do
      super()
      render_template a
    end
  end

  private

  def set_view_paths
    prepend_view_path Rails.root.join("app/concepts/#{namespace}/views")
  end

  def namespace
    self.class.name.deconstantize
  end

  def render_template(*args)
    options = args.extract_options!

    options[:template] = params[:action]

    render(*(args << options))
  end
end
pr

products_controller.rb

module Products
  class ProductsController < ApplicationController
    prepend DomainConcepts
  end
end

routes.rb

resources :products, module: 'products'