Implement track scheduling

Add track association to schedule
Show schedules in admin sidebar to track organizers
Allow track organizers to manage the schedules of their tracks
Don't allow self-organized track events to be dragged or unscheduled in
a conference schedule
Make scheduled events of self-organized tracks appear semitransparent in
conference schedules
Make the rooms of confirmed self_organized tracks appear semitransparent
and don't allow events to be scheduled to it in the conference schedules
during the dates of its track
Create admin/SchedulesController#new action
Add a button in admin/Schedules#index to create schedules for tracks
Add self_organized scope to Track
Modify Schedules#show to handle track schedules and show a unified
schedule
Allow track organizers to create new schedules for their tracks
Correctly identify scheduled and unscheduled events in Schedules#events
Fix Event#room and Event#time for when the event is scheduled in a track
schedule
Modify Program#selected_event_schedules to include the event_schedules
of selected track schedules
Modify Track#revoke_role_and_cleanup to destroy the track's schedules
and revert its events' state to new
Add tabs for conference and track schedules in admin/Schedules#index
Add button to Create/Show a tracks schedule in Tracks#index and #show
Fix concurrent_events in application_helper because of changes in
Program#selected_event_schedules
Do not take into account cfp_active in Event#valid_track
Modify EventsController#get_tracks accordingly
Enforce cfp_active of track to be enabled for proposals in
ProposalsController#create and #update
Add support for multiple schedules per track
Add selected_schedule_id to Track
Load EventSchedules of selected track schedules for conference schedules
in admin/SchedulesController#show
Modify SchedulesController#show to take into account only the selected
track schedules
Create Event#selected_schedule_id and use it in Event#scheduled? and
Event#time
Validate that an EventSchedule for an event of a self-organized track
belongs to one of the track's schedules
Add 'Manage' button in Tracks#index, #show that sends you to the admin
side of things
Add admin/TracksController#update_selected_schedule to update the
selected_schedule_id of tracks

app/models/event_schedule.rb

@@ -12,8 +12,9 @@ class EventSchedule < ActiveRecord::Base
   validates :event, uniqueness: { scope: :schedule }
   validate :start_after_end_hour
   validate :start_before_start_hour
-  validate :room_of_track
+  validate :same_room_as_track
   validate :during_track
+  validate :valid_schedule
 
   scope :confirmed, -> { joins(:event).where('state = ?', 'confirmed') }
   scope :canceled, -> { joins(:event).where('state = ?', 'canceled') }
@@ -56,24 +57,33 @@ class EventSchedule < ActiveRecord::Base
   end
 
   ##
-  # Validates that the event is scheduled in the same room as it's track
+  # Validates that the event is scheduled in the same room as its track
   #
-  def room_of_track
-    if event && event.track.try(:room) && event.track.room != room
-      errors.add(:room, "must be the same as the track's room (#{event.track.room.name})")
+  def same_room_as_track
+    return unless event.try(:track).try(:room)
+    errors.add(:room, "must be the same as the track's room (#{event.track.room.name})") unless event.track.room == room
+  end
+
+  ##
+  # Validates that the event is scheduled within its track's time slot
+  #
+  def during_track
+    return unless event.try(:track) && start_time
+
+    if event.track.try(:start_date) && event.track.start_date > start_time
+      errors.add(:start_time, "can't be before the track's start date (#{event.track.start_date})")
+    end
+
+    if event.track.try(:end_date) && event.track.end_date + 1.day < end_time
+      errors.add(:end_time, "can't be after the track's end date (#{event.track.end_date})")
     end
   end
 
   ##
-  # Validates that the event is scheduled within it's track's time slot
+  # Validates that the event is scheduled in its self-organized tracks's schedules
   #
-  def during_track
-    if event && event.track.try(:start_date) && event.track.start_date > start_time
-      errors.add(:start_time, "can't be before the track's start date (#{event.track.start_date})")
-    end
-
-    if event && event.track.try(:end_date) && event.track.end_date + 1.day < end_time
-      errors.add(:end_time, "can't be after the track's end date (#{event.track.end_date})")
-    end
+  def valid_schedule
+    return unless event.try(:track).try(:self_organized?) && schedule
+    errors.add(:schedule, "must be one of #{event.track.name} track's schedules") unless event.track.schedules.include?(schedule)
   end
 end