Implement missing & remaining pieces propagation + cleaner forms

app/models/offline.rb

@@ -9,6 +9,7 @@
 #  name             :string           not null
 #  remaining_pieces :integer
 #  start_time       :datetime         not null
+#  submitted        :boolean
 #  created_at       :datetime         not null
 #  updated_at       :datetime         not null
 #  contest_id       :integer          not null
@@ -32,7 +33,10 @@ class Offline < ApplicationRecord
 
   generates_token_for :token
 
+  before_save :clean_pieces
+
   validates :name, presence: true
+  validates :remaining_pieces, presence: true, if: -> { submitted && !completed }
   validates :start_time, presence: true
 
   validate :end_image_is_present
@@ -56,10 +60,7 @@ class Offline < ApplicationRecord
   end
 
   def end_image_is_present
-    logger = Logger.new(STDOUT)
-    logger.info(self.missing_pieces)
-    logger.info(self.missing_pieces.present?)
-    if self.completed && self.images.length < 2
+    if self.submitted && self.images.length < 2
       errors.add(:end_image, I18n.t("activerecord.errors.models.offline.attributes.end_image.blank"))
     end
   end
@@ -69,4 +70,12 @@ class Offline < ApplicationRecord
       errors.add(:images, I18n.t("activerecord.errors.models.offline.attributes.start_image.blank"))
     end
   end
+
+  def clean_pieces
+    if self.completed
+      self.remaining_pieces = nil
+    else
+      self.missing_pieces = nil
+    end
+  end
 end