Show offline contestants in dashboard

app/models/offline.rb

@@ -2,25 +2,29 @@
 #
 # Table name: offlines
 #
-#  id         :integer          not null, primary key
-#  completed  :boolean
-#  end_time   :datetime
-#  name       :string           not null
-#  start_time :datetime         not null
-#  created_at :datetime         not null
-#  updated_at :datetime         not null
-#  contest_id :integer          not null
+#  id            :integer          not null, primary key
+#  completed     :boolean
+#  end_time      :datetime
+#  name          :string           not null
+#  start_time    :datetime         not null
+#  created_at    :datetime         not null
+#  updated_at    :datetime         not null
+#  contest_id    :integer          not null
+#  contestant_id :integer
 #
 # Indexes
 #
-#  index_offlines_on_contest_id  (contest_id)
+#  index_offlines_on_contest_id     (contest_id)
+#  index_offlines_on_contestant_id  (contestant_id)
 #
 # Foreign Keys
 #
-#  contest_id  (contest_id => contests.id)
+#  contest_id     (contest_id => contests.id)
+#  contestant_id  (contestant_id => contestants.id)
 #
 class Offline < ApplicationRecord
   belongs_to :contest
+  belongs_to :contestant, optional: true
 
   has_many_attached :images