diff --git a/app/controllers/api/v1/events_controller.rb b/app/controllers/api/v1/events_controller.rb
index e654f167..229c264a 100644
--- a/app/controllers/api/v1/events_controller.rb
+++ b/app/controllers/api/v1/events_controller.rb
@@ -4,9 +4,9 @@ module Api
       respond_to :json
 
       def index
-        events = Event.includes(:conference, :track, :room, :event_type, event_user: :user)
+        events = Event.includes(:conference, :track, :room, :event_type, event_users: :user)
         unless params[:conference_id].blank?
-          events = events.where('conferences.guid' => params[:conference_id])
+          events = events.where(conferences: { guid: params[:conference_id] })
         end
         respond_with events.confirmed
       end
diff --git a/app/controllers/api/v1/speakers_controller.rb b/app/controllers/api/v1/speakers_controller.rb
index cbf298d4..5166ed71 100644
--- a/app/controllers/api/v1/speakers_controller.rb
+++ b/app/controllers/api/v1/speakers_controller.rb
@@ -8,9 +8,9 @@ module Api
           users = User.joins(:event_users)
         else
           users = User.joins(event_users: { event: :conference })
-          users = users.where('conferences.guid' => params[:conference_id])
+          users = users.where(conferences: { guid: params[:conference_id] })
         end
-        users = users.where('event_users.event_role' => 'speaker')
+        users = users.where(event_users: {event_role: :speaker})
         render json: users, each_serializer: SpeakerSerializer
       end
     end
diff --git a/app/controllers/api/v1/tracks_controller.rb b/app/controllers/api/v1/tracks_controller.rb
index b196dc03..ba09bb59 100644
--- a/app/controllers/api/v1/tracks_controller.rb
+++ b/app/controllers/api/v1/tracks_controller.rb
@@ -8,7 +8,7 @@ module Api
           tracks = Track.all
         else
           tracks = Track.joins(:conference)
-          tracks = tracks.where("conferences.guid" => params[:conference_id])
+          tracks = tracks.where(conferences: { guid: params[:conference_id] })
         end
         respond_with tracks
       end
diff --git a/app/controllers/schedule_controller.rb b/app/controllers/schedule_controller.rb
index e9d60d1a..85aa6d19 100644
--- a/app/controllers/schedule_controller.rb
+++ b/app/controllers/schedule_controller.rb
@@ -3,7 +3,9 @@ class ScheduleController < ApplicationController
   layout "application"
 
   def index
-    @conference = Conference.includes(:rooms, events: [:speakers, :track, :event_type]).where("conferences.short_title" => params[:conference_id]).first
+    @conference = Conference.
+        includes(:rooms, events: [:speakers, :track, :event_type]).
+        where(conferences: { short_title: params[:conference_id] }).first
     @rooms = @conference.rooms
     @events = @conference.events
     @dates = @conference.start_date..@conference.end_date
diff --git a/app/serializers/speaker_serializer.rb b/app/serializers/speaker_serializer.rb
index 3dfc87d7..64fb8936 100644
--- a/app/serializers/speaker_serializer.rb
+++ b/app/serializers/speaker_serializer.rb
@@ -1,7 +1,7 @@
 class SpeakerSerializer < ActiveModel::Serializer
   include ActionView::Helpers::TextHelper
 
-  attributes :guid, :name, :affiliation, :biography
+  attributes :name, :affiliation, :biography
 
   def name
     object.name