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Routing Concerns and Scopes in Rails Discussion

Hey Chris, thanks for making a video on this and so quickly. I had been wanting to use routing concerns for a while but finding a good way to access the resource had me stumped. This does the trick.

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Alternative approach to using @scope:

resources :todos, likeable_type: "Todo" do
  concerns :likeable
end

And you can use params[:likeable_type] in your Likes controller.

I find it a bit more explicit and safer as I know exactly what strings I’ll be constantizing.

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Interesting. I don't think I've seen this documented anywhere. It seems like it would filter out the only: and other options and the leftover ones are set as defaults?

I know you can do this:

resources :todos do
  scope defaults: { record_type: "Todo" } do
    concerns :likeable
  end
end
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Neat episode!

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The concern definition block actually takes a hash of options, so another approach could look like:

  concern :likeable do |options = {}|
    resource :like, only: :update, defaults: **options
  end

  resources :comments do
    concerns :likeable, resource: :comments
  end
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