Do not use JS to initialize the schedule

- Only use JS for the drag&drop functionality and to the set/alter the time and rooms of the EventSchedule object.

- Introduce has_many :events, through: :event_schedules association to get unscheduled event easily

app/models/event.rb

@@ -78,15 +78,6 @@ class Event < ActiveRecord::Base
     selected_event_schedule.present?
   end
 
-  ##
-  # Checkes if the event has a start_time and a room for the given schedule
-  # (given by its id) or for the selected one if there is any.
-  # ====Returns
-  # * +true+ or +false+
-  def unscheduled?(schedule_id)
-    state == 'confirmed' && !event_schedule(schedule_id).present?
-  end
-
   def registration_possible?
     return false unless require_registration && state == 'confirmed'
     return true if max_attendees.nil?
@@ -138,15 +129,6 @@ class Event < ActiveRecord::Base
     end
   end
 
-  def as_json(options={})
-    json = super({ include: { event_schedules: { methods: [:room_guid] } } }.merge(options))
-    json[:track_color] = track.try(:color) || '#FFFFFF'
-    json[:track_text_color] = ApplicationController.helpers.contrast_color(json[:track_color])
-    json[:length] = event_type.try(:length) || EventType::LENGTH_STEP
-
-    json
-  end
-
   def transition_possible?(transition)
     self.class.state_machine.events_for(current_state).include?(transition)
   end
@@ -263,11 +245,6 @@ class Event < ActiveRecord::Base
     selected_event_schedule.try(:start_time)
   end
 
-  # returns the event_schedule for this event and the schedule given in case that it exists
-  def event_schedule(schedule_id)
-    event_schedules.find_by(schedule_id: schedule_id)
-  end
-
   # returns the event_schedule for this event and for the selected_schedule
   def selected_event_schedule
     event_schedules.find_by(schedule_id: program.try(:selected_schedule_id))

app/models/program.rb

@@ -32,10 +32,6 @@ class Program < ActiveRecord::Base
       joins(:event_schedules).where('event_schedules.schedule_id = ?', schedule_id)
     end
 
-    def unscheduled(schedule_id)
-      select{ |e| e.unscheduled?(schedule_id) }
-    end
-
     def highlights
       where(state: :confirmed, is_highlight: true)
     end

app/models/schedule.rb

@@ -1,4 +1,5 @@
 class Schedule < ActiveRecord::Base
   belongs_to :program
   has_many :event_schedules, dependent: :destroy
+  has_many :events, through: :event_schedules
 end