Add has_service? to page_nature

Add a small helper method to easier figure out, if a page has a service.

Author: kulturbande

app/models/alchemy/page/page_natures.rb

@@ -173,6 +173,10 @@ def cache_page?
 
         definition.cache != false && definition.searchresults != true
       end
+
+      def has_service?
+        definition.service.present?
+      end
     end
   end
 end

spec/models/alchemy/page_spec.rb

@@ -1915,6 +1915,20 @@ module Alchemy
       end
     end
 
+    describe "#has_service?" do
+      let(:page) { build(:alchemy_page) }
+
+      subject { page.has_service? }
+
+      it { expect(subject).to be_falsey }
+
+      context "when page has a service" do
+        let(:page) { build(:alchemy_page, page_layout: "with_service") }
+
+        it { expect(subject).to be_truthy }
+      end
+    end
+
     describe "#expiration_time" do
       subject { page.expiration_time }