Implement playlists/show in API

app/controllers/api/playlists_controller.rb

@@ -4,6 +4,10 @@ module API
       @playlists = Playlist.all
     end
 
+    def show
+      @playlist = Playlist.find(params[:id])
+    end
+
     def create
       @playlist = current_user.playlists.build playlist_params
       @playlist.save

app/views/api/playlists/show.rabl

@@ -0,0 +1,4 @@
+object @playlist
+
+attribute :id
+attribute :name

config/routes.rb

@@ -4,7 +4,7 @@ Rails.application.routes.draw do
   namespace :api do
     get '/ping', to: 'application#ping'
     match '*all', to: 'application#cor_preflight', via: :options
-    resources :playlists, only: %i[index create]
+    resources :playlists, only: %i[index show create]
     resources :sessions, only: :create
     resources :sounds, only: :show
     resources :tracks, only: :index

spec/integration/api/playlists_spec.rb

@@ -15,6 +15,16 @@ describe 'API playlists' do
     ]
   end
 
+  it 'shows a playlist' do
+    playlist = create :playlist
+    get api_playlist_path playlist, format: :json
+
+    expect(json).to match(
+      id:   playlist.id,
+      name: playlist.name
+    )
+  end
+
   it 'creates playlist' do
     playlist = attributes_for :playlist
     post api_playlists_path,