Validate presence of route by Routable concern

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/concerns/routable.rb

@@ -7,6 +7,7 @@ module Routable
     has_one :route, as: :source, autosave: true, dependent: :destroy
 
     validates_associated :route
+    validates :route, presence: true
 
     before_validation :update_route_path, if: :full_path_changed?
   end

spec/models/concerns/routable_spec.rb

@@ -3,6 +3,10 @@ require 'spec_helper'
 describe Group, 'Routable' do
   let!(:group) { create(:group) }
 
+  describe 'Validations' do
+    it { is_expected.to validate_presence_of(:route) }
+  end
+
   describe 'Associations' do
     it { is_expected.to have_one(:route).dependent(:destroy) }
   end