Public scoreboard scaffold

app/controllers/application_controller.rb

@@ -26,4 +26,8 @@ class ApplicationController < ActionController::Base
     flash[:error] = t "#{policy_name}.#{exception.query}", scope: "pundit", default: :default
     redirect_back_or_to(root_path)
   end
+
+  def not_found
+    render file: "#{Rails.root}/public/404.html", layout: false, status: :not_found
+  end
 end

app/controllers/contests_controller.rb

@@ -56,6 +56,20 @@ class ContestsController < ApplicationController
     authorize @contest
   end
 
+  def scoreboard
+    @contest = Contest.find_by(slug: params[:id])
+    unless @contest
+      skip_authorization
+      not_found and return
+    end
+    authorize @contest
+
+    @title = @contest.name
+    @contestants = @contest.contestants.order(:name)
+    @puzzles = @contest.puzzles.order(:id)
+    render :scoreboard
+  end
+
   private
 
   def set_badges

app/models/contest.rb

@@ -27,5 +27,5 @@ class Contest < ApplicationRecord
   has_many :puzzles, dependent: :destroy
 
   validates :name, presence: true
-  validates :slug, presence: true, format: { with: /\A(\w|-)*\z/, message: 'Only alphanumeric characters, "-" and "_" allowed.' }
+  validates :slug, presence: true, uniqueness: true, format: { with: /\A(\w|-)*\z/, message: 'Only alphanumeric characters, "-" and "_" allowed.' }
 end

app/policies/contest_policy.rb

@@ -26,4 +26,8 @@ class ContestPolicy < ApplicationPolicy
   def destroy?
     record.user.id == user.id || user.admin?
   end
+
+  def scoreboard?
+    true
+  end
 end

app/views/contests/scoreboard.html.slim

@@ -0,0 +1,18 @@
+table.table.table-striped.table-hover
+  thead
+    tr
+      th scope="col"
+        | Rank
+      th scope="col"
+        | Name
+      th scope="col"
+        | Completed puzzles
+  tbody
+    - @contestants.each_with_index do |contestant, index|
+      tr scope="row"
+        td
+          = index + 1
+        td
+          = contestant.name
+        td
+          = contestant.completions.length

app/views/contests/show.html.slim

@@ -14,7 +14,7 @@
         | Edit contest
     p
       |> Public scoreboard:
-      = link_to root_url + "public/#{@contest.slug}"
+      = link_to root_url + "public/#{@contest.slug}", root_url + "public/#{@contest.slug}"
     
 .row.mb-4
   .col-6

config/routes.rb

@@ -16,4 +16,6 @@ Rails.application.routes.draw do
   resources :passwords, param: :token
   resource :session
   resources :users
+
+  get "public/:id", to: "contests#scoreboard"
 end