EventSchedule validations

event, schedule, room and start_time are mandatory in EventSchedule.

app/models/event.rb

@@ -75,7 +75,7 @@ class Event < ActiveRecord::Base
   # ====Returns
   # * +true+ or +false+
   def scheduled?
-    selected_event_schedule.try(:start_time).present? && selected_event_schedule.try(:room).present?
+    selected_event_schedule.present?
   end
 
   ##
@@ -84,7 +84,7 @@ class Event < ActiveRecord::Base
   # ====Returns
   # * +true+ or +false+
   def unscheduled?(schedule_id)
-    state == 'confirmed' && (!event_schedule(schedule_id).try(:start_time).present? || !event_schedule(schedule_id).try(:room).present?)
+    state == 'confirmed' && !event_schedule(schedule_id).present?
   end
 
   def registration_possible?

app/models/event_schedule.rb

@@ -3,13 +3,16 @@ class EventSchedule < ActiveRecord::Base
   belongs_to :event
   belongs_to :room
 
+  validates :schedule, presence: true
+  validates :event, presence: true
+  validates :room, presence: true
+  validates :start_time, presence: true
+
   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   scope :withdrawn, -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 { joins(:event).where('state = ?', 'withdrawn') }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
+  delegate :guid, to: :room, prefix: true
 
   ##
   # Returns end of the event

app/models/program.rb

@@ -28,7 +28,7 @@ class Program < ActiveRecord::Base
     end
 
     def scheduled(schedule_id)
-      joins(:event_schedules).where('event_schedules.schedule_id = ? AND event_schedules.start_time IS NOT NULL AND event_schedules.room_id IS NOT NULL', schedule_id)
+      joins(:event_schedules).where('event_schedules.schedule_id = ?', schedule_id)
     end
 
     def unscheduled(schedule_id)