Add internal waiting_list route for migration (#734)

* add internal waiting_list route for migration

* don't break if the competition has no waiting list

app/controllers/internal_controller.rb

@@ -121,4 +121,14 @@ def history
     history = RegistrationHistory.find(attendee_id)
     render json: history
   end
+
+  def waiting_list
+    competition_id = params.require(:competition_id)
+    begin
+      waiting_list = WaitingList.find(competition_id)
+      render json: waiting_list.entries
+    rescue Dynamoid::Errors::RecordNotFound
+      render json: []
+    end
+  end
 end

config/routes.rb

@@ -11,6 +11,7 @@
   get '/healthcheck', to: 'healthcheck#index'
   post '/api/internal/v1/update_payment', to: 'internal#update_payment_status'
   get '/api/internal/v1/:competition_id/registrations', to: 'internal#list_registrations'
+  get '/api/internal/v1/:competition_id/waiting_list', to: 'internal#waiting_list'
   post '/api/internal/v1/:competition_id/add', to: 'internal#create'
   get '/api/internal/v1/:attendee_id', to: 'internal#show_registration'
   get '/api/internal/v1/:attendee_id/history', to: 'internal#history'