Add judges codes

app/models/completion.rb

@@ -3,6 +3,7 @@
 # Table name: completions
 #
 #  id                      :integer          not null, primary key
+#  code                    :string
 #  completed               :boolean
 #  display_relative_time   :string
 #  display_time_from_start :string
@@ -50,10 +51,11 @@ class Completion < ApplicationRecord
   validates :puzzle_id, uniqueness: { scope: :contestant }, if: -> { contest.puzzles.size > 1 }
   validates :remaining_pieces, numericality: { only_integer: true }, if: -> { remaining_pieces.present? }
   validate :remaining_pieces_is_correct, if: -> { remaining_pieces.present? }
+  validate :contest_code_is_correct, if: -> { code.present? }
 
   def remaining_pieces_is_correct
     if self.remaining_pieces > self.puzzle.pieces
-      errors.add(:remaining_pieces, "Cannot be greater than the number of pieces for this puzzle")
+      errors.add(:remaining_pieces, I18n.t("activerecord.errors.models.completion.attributes.remaining_pieces.too_large"))
     end
   end
 
@@ -92,4 +94,10 @@ class Completion < ApplicationRecord
       self.projected_time = assembled_time + Integer(self.remaining_pieces.to_f / pieces_per_second)
     end
   end
+
+  def contest_code_is_correct
+    if self.code != self.contest.code
+      errors.add(:code, I18n.t("activerecord.errors.models.completion.attributes.code.mismatch"))
+    end
+  end
 end