adds random order to debates' index

app/controllers/debates_controller.rb

@@ -82,7 +82,7 @@ class DebatesController < ApplicationController
     end
 
     def parse_order
-      @valid_orders = ['created_at', 'score', 'most_commented']
+      @valid_orders = ['created_at', 'score', 'most_commented', 'random']
       @order = @valid_orders.include?(params[:order]) ? params[:order] : 'created_at'
     end
 

app/models/debate.rb

@@ -31,6 +31,7 @@ class Debate < ActiveRecord::Base
   scope :sort_by_score , -> { reorder(cached_votes_score: :desc) }
   scope :sort_by_created_at, -> { reorder(created_at: :desc) }
   scope :sort_by_most_commented, -> { reorder(comments_count: :desc) }
+  scope :sort_by_random, -> { reorder("RANDOM()") }
 
   # Ahoy setup
   visitable # Ahoy will automatically assign visit_id on create

config/locales/en.yml

@@ -71,7 +71,8 @@ en:
       orders:
         created_at: newest
         score: best rated
-        most_commented: "most commented"
+        most_commented: most commented
+        random: random
       filter_topic:
         one: "You are seeing one debate with the topic '%{topic}'"
         other: "You are seeing %{count} debates with the topic '%{topic}'"

config/locales/es.yml

@@ -72,6 +72,7 @@ es:
         created_at: "más nuevos"
         score: "mejor valorados"
         most_commented: "más comentados"
+        random: "aleatorio"
       filter_topic:
         one: "Estás viendo un debate con el tema ''%{topic}''"
         other: "Estás viendo %{count} debates con el tema '%{topic}'"

spec/features/debates_spec.rb

@@ -409,5 +409,24 @@ feature 'Debates' do
       expect(@most_recent_debate.title).to appear_before(@most_score_debate.title)
       expect(@most_score_debate.title).to appear_before(@most_commented_debate.title)
     end
+
+    scenario 'Debates are ordered randomly' do
+      create_list(:debate, 12)
+      visit debates_path
+
+      select 'random', from: 'order-selector'
+      expect(page).to have_select('order-selector', selected: 'random')
+      debates_first_time = find("#debates").text
+
+      select 'most commented', from: 'order-selector'
+      expect(page).to have_select('order-selector', selected: 'most commented')
+      expect(find("#debates .debate", match: :first)).to have_content(@most_commented_debate.title)
+
+      select 'random', from: 'order-selector'
+      expect(page).to have_select('order-selector', selected: 'random')
+      debates_second_time = find("#debates").text
+
+      expect(debates_first_time).to_not eq(debates_second_time)
+    end
   end
 end