isolate_namespace_advanced

⚙️ Leverage Advanced isolate_namespace Customizations

By default, isolate_namespace sets up a module scope, but you can extend it to customize route names, controller paths, and view prefixes for absolute isolation. This ensures no constant collisions or route helper clashes with the host application. Use initializers in your engine.rb to override defaults and inject your own naming convention.

# lib/my_engine/engine.rb
engine_name = :my_engine
module MyEngine
  class Engine < ::Rails::Engine
    isolate_namespace MyEngine

    initializer "#{engine_name}.route_helpers" do |app|
      app.routes.named_routes.helper_names[:main_app_path] = "#{engine_name}_main_app"
    end

    initializer "#{engine_name}.view_prefixes" do |_|
      ActiveSupport.on_load(:action_controller) do
        prepend_view_path MyEngine::Engine.root.join('app', 'views', 'shared_#{engine_name}')
      end
    end
  end
end