Public schedule adapted to the new relations

Public schedule and all events adapted to the new relations and models to allow having several schedules in the admin shcedule.

app/models/event_schedule.rb

@@ -3,7 +3,25 @@ class EventSchedule < ActiveRecord::Base
   belongs_to :event
   belongs_to :room
 
+  scope :confirmed, -> { joins(:event).where('state = ?', 'confirmed') }
+  scope :canceled, -> { joins(:event).where('state = ?', 'canceled') }
+  scope :withdrawn, -> { joins(:event).where('state = ?', 'withdrawn') }
+
   def room_guid
     room.try(:guid)
   end
+
+  ##
+  # Returns end of the event
+  #
+  def end_time
+    start_time + event.event_type.length.minutes
+  end
+
+  ##
+  # Returns events that are scheduled in the same room and start_time as event
+  #
+  def intersecting_events
+    room.event_schedules.where(start_time: start_time, schedule: schedule).where.not(id: id)
+  end
 end