Add setting uniqueness test

app/controllers/settings_controller.rb

@@ -1,3 +0,0 @@
-class SettingsController < ApplicationController
-
-end

app/models/setting.rb

@@ -1,3 +1,4 @@
 class Setting < ActiveRecord::Base
   belongs_to :setting_group
+  validates :code, uniqueness: { scope: :setting_group_id }
 end

config/locales/en.yml

@@ -64,6 +64,10 @@ en:
               invalid: 'IPv4 is invalid'
             ipv6:
               invalid: 'IPv6 is invalid'
+        setting:
+          attributes:
+            code:
+              taken: 'Code already exists'
     attributes:
       domain:
         name: 'Domain name'

config/routes.rb

@@ -6,7 +6,6 @@ Rails.application.routes.draw do
   end
 
   resources :setting_groups
-  resources :settings
 
   # The priority is based upon order of creation: first created -> highest priority.
   # See how all your routes lay out with "rake routes".

spec/models/setting_spec.rb

@@ -2,4 +2,20 @@ require "rails_helper"
 
 describe Setting do
   it { should belong_to(:setting_group) }
+
+  it 'validates code uniqueness' do
+    sg = Fabricate(:setting_group)
+    sg.settings.build(code: 'this_is_code')
+    expect(sg.save).to be true
+
+    sg.settings.build(code: 'this_is_code')
+    expect(sg.save).to be false
+    err = sg.settings.last.errors[:code].first
+    expect(err).to eq('Code already exists')
+
+    sg_2 = Fabricate(:setting_group)
+
+    sg_2.settings.build(code: 'this_is_code')
+    expect(sg_2.save).to be true
+  end
 end