Slim down the Api::EventsController#index

app/controllers/api/events_controller.rb

@@ -1,14 +1,8 @@
 class Api::EventsController < Api::ApplicationController
+  include ::CurrentConferenceAssigning
+  before_filter :require_current_conference!
+
   def index
-    @conference = find_conference
-    @events = @conference.events.includes(:track, :event_type)
-
-    render json: @events, include: [:track, :event_type]
-  end
-
-  private
-
-  def find_conference
-    Conference.find params[:conference_id]
+    @events = current_conference.events.includes(:participations)
   end
 end

app/views/api/events/index.jbuilder

@@ -0,0 +1,12 @@
+ json.array! @events do |event|
+  json.id event.id
+  json.title event.title
+  json.subtitle event.subtitle
+  json.length event.length
+  json.language event.language
+  json.abstract event.abstract
+  json.description event.description
+  json.event_type_id event.event_type_id
+  json.track_id event.track_id
+  json.participant_user_ids event.participations.map(&:participant_id)
+end