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Your Teacher
Chris Oliver
Hi, I'm Chris. I'm the creator of GoRails, Hatchbox.io and Jumpstart. I spend my time creating tutorials and tools to help Ruby on Rails developers build apps better and faster.
About This Episode
Rails engines often need a way of providing JavaScript for their views. We can do this using Importmaps regardless of what the application is using for assets.
Notes
Create a new Importmap::Map:
module MyEngine
mattr_accessor :importmap, default: Importmap::Map.new
end
Pin imports
module MyEngine
class Engine < ::Rails::Engine
initializer "my_engine.importmap" do
MyEngine.importmap.draw root.join("config/importmap.rb")
MyEngine.importmap.cache_sweeper watches: root.join("app/javascript")
ActiveSupport.on_load(:action_controller_base) do
before_action { MyEngine.importmap.cache_sweeper.execute_if_updated }
end
end
end
end
Render it in the view:
<%= javascript_importmap_tags "application", importmap: MyEngine.importmap %>