Correctly order participants

app/controllers/contests_controller.rb

@@ -15,7 +15,7 @@ class ContestsController < ApplicationController
     @title = I18n.t("contests.show.title", name: @contest.name)
     @action_name = t("helpers.buttons.edit")
     @action_path = edit_contest_path(@contest)
-    @contestants = @contest.contestants.order(:name)
+    @contestants = @contest.contestants.sort_by { |contestant| [ -contestant.completions.size, contestant.time_seconds ] }
     @puzzles = @contest.puzzles.order(:id)
     @messages = @contest.messages.order(:time_seconds)
     set_badges
@@ -66,7 +66,7 @@ class ContestsController < ApplicationController
     authorize @contest
 
     @title = I18n.t("contests.scoreboard.title", name: @contest.name)
-    @contestants = @contest.contestants.order(:name)
+    @contestants = @contest.contestants.sort_by { |contestant| [ -contestant.completions.size, contestant.time_seconds ] }
     @puzzles = @contest.puzzles.order(:id)
     render :scoreboard
   end

app/models/contestant.rb

@@ -6,6 +6,7 @@
 #  display_time :string
 #  email        :string
 #  name         :string
+#  time_seconds :integer
 #  created_at   :datetime         not null
 #  updated_at   :datetime         not null
 #  contest_id   :integer          not null
@@ -22,5 +23,14 @@ class Contestant < ApplicationRecord
   belongs_to :contest
   has_many :completions
 
+  before_create :initialize_time_seconds
+
   validates :name, presence: true
+  validates :time_seconds, presence: true
+
+  private
+
+  def initialize_time_seconds
+    self.time_seconds = 0
+  end
 end