Fix coding standards in application files

app/controllers/api/application_controller.rb

@@ -1,7 +1,7 @@
 module API
   class ApplicationController < ::ApplicationController
     skip_before_filter :verify_authenticity_token
-    skip_before_filter :authenticate!, only: [:cor_preflight]
+    skip_before_filter :authenticate!, only: :cor_preflight
 
     before_filter :cor_filter
 

app/controllers/api/playlists_controller.rb

@@ -5,14 +5,15 @@ module API
     end
 
     def create
-      @playlist = current_user.playlists.build(playlist_params)
+      @playlist = current_user.playlists.build playlist_params
       @playlist.save
     end
 
+
     private
 
     def playlist_params
-      params.require(:playlist).permit(:name)
+      params.require(:playlist).permit :name
     end
   end
 end

app/controllers/api/sessions_controller.rb

@@ -1,11 +1,11 @@
 module API
   class SessionsController < ApplicationController
-    skip_before_filter :authenticate!, only: [:create]
+    skip_before_filter :authenticate!, only: :create
 
     def create
       user = User.find_by_email(params[:session][:email])
 
-      unless user.try(:authenticate?, params[:session][:password])
+      unless user.try :authenticate?, params[:session][:password]
         return render json: '', status: :not_found
       end
 

app/controllers/api/sounds_controller.rb

@@ -2,7 +2,7 @@ module API
   class SoundsController < ApplicationController
     # FIXME: add some tests!
     def show
-      sound = Sound.find params[:id]
+      sound = Sound.find(params[:id])
       send_file sound.path, type: sound.mime_type
     end
   end