Add hidden setting to puzzles

#19

app/controllers/contestants_controller.rb

@@ -149,7 +149,7 @@ class ContestantsController < ApplicationController
     end
     @contest = @contestant.contest
     I18n.locale = @contest.lang
-    @puzzles = @contest.puzzles
+    @puzzles = @contest.puzzles.where(hidden: false).or(@contest.puzzles.where(hidden: nil)).order(:id)
     @completion = Completion.new
     @completion.completed = true
     @public = true

app/controllers/contests_controller.rb

@@ -99,7 +99,7 @@ class ContestsController < ApplicationController
     if params.key?(:hide_offline) && params[:hide_offline] == "true"
       @contestants = @contestants.select { |contestant| !contestant.offline.present? }
     end
-    @puzzles = @contest.puzzles.order(:id)
+    @puzzles = @contest.puzzles.where(hidden: false).or(@contest.puzzles.where(hidden: nil)).order(:id)
     if params.key?(:hide_offline) && params.key?(:category)
       @action_path = "/public/#{@contest.friendly_id}?hide_offline=#{params[:hide_offline]}&category=#{params[:category]}"
     elsif params.key?(:category)

app/controllers/puzzles_controller.rb

@@ -59,6 +59,6 @@ class PuzzlesController < ApplicationController
   end
 
   def puzzle_params
-    params.expect(puzzle: [ :brand, :name, :image, :pieces ])
+    params.expect(puzzle: [ :brand, :name, :image, :pieces, :hidden ])
   end
 end