Offline participation: implement completed puzzle methods

app/models/offline.rb

@@ -3,6 +3,7 @@
 # Table name: offlines
 #
 #  id         :integer          not null, primary key
+#  completed  :boolean
 #  end_time   :datetime
 #  name       :string           not null
 #  start_time :datetime         not null
@@ -21,20 +22,25 @@
 class Offline < ApplicationRecord
   belongs_to :contest
 
-  has_one_attached :start_image
-  has_one_attached :end_image
+  has_many_attached :images
+
+  generates_token_for :token
 
   validates :name, presence: true
   validates :start_time, presence: true
 
+  validate :end_image_is_present
   validate :start_image_is_present
 
+  def end_image_is_present
+    if self.completed && self.images.length < 2
+      errors.add(:end_image, I18n.t("activerecord.errors.models.offline.attributes.end_image.blank"))
+    end
+  end
+
   def start_image_is_present
-    logger = Logger.new(STDOUT)
-    logger.info "TESTddfzefzef"
-    logger.info self.start_image.attached?
-    if !self.start_image.attached?
-      errors.add(:start_image, I18n.t("activerecord.errors.models.offline.attributes.start_image.blank"))
+    if !self.images.attached?
+      errors.add(:images, I18n.t("activerecord.errors.models.offline.attributes.start_image.blank"))
     end
   end
 end