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/views/admin/schedule/_day_tab.html.haml

@@ -1,13 +1,20 @@
+- date_event_schedules = @event_schedules.select{ |e| e.start_time.to_date.eql? date }
 .row
   - @rooms.each do |room|
     .col-md-2.col-xs-6
       .room-name
+        - room_date_event_schedules = date_event_schedules.select{ |e| e.room == room }
         = room.name
       - (9*4..18*4).each do |slot|
         - hour = slot / 4
-        - time = (15 * (slot % 4) == 0) ? '00' : 15 * (slot % 4)
-        .schedule-room-slot{ id: "schedule-room-#{room.guid}-#{hour}-#{time}", |
+        - minutes = (15 * (slot % 4) == 0) ? '00' : 15 * (slot % 4)
+        - time = "#{hour}:#{minutes}"
+        .schedule-room-slot{ id: "schedule-room-#{room.guid}-#{hour}-#{minutes}", |
                              "room-guid" => room.guid, |
-                             hour: "#{hour}:#{time}", |
+                             hour: time, |
                              date: date}
-          = "#{hour}:#{time}"
+          .div
+            = time
+          - event_schedules = room_date_event_schedules.select{ |e| (e.start_time.hour.to_s + e.start_time.strftime(':%M')).eql? time }
+          - if event_schedules.any?
+            = render partial: 'event', locals: { event: event_schedules.first.event }