refactored conferences controller, dividing responsabilities using an service and an query

app/services/queries/conferences.rb

@@ -0,0 +1,32 @@
+class Queries::Conferences
+  def initialize(conference: nil)
+    @conference = conference
+  end
+
+  def self.conference_by_filter(conference_finder_conditions)
+    Conference.unscoped.eager_load(
+      :splashpage,
+      :program,
+      :registration_period,
+      :contact,
+      venue: :commercial
+    ).find_by!(conference_finder_conditions)
+  end
+
+  def sponsorship_levels
+    conference.sponsorship_levels.eager_load(
+      :sponsors
+    ).order('sponsorship_levels.position ASC', 'sponsors.name')
+  end
+  
+  def confirmed_tracks
+    conference.confirmed_tracks.eager_load(
+      :room
+    ).order('tracks.name')
+  end
+
+  private
+
+  attr :conference
+end
+