Add sorting parameter to perform_search method

add date sort to perform_search method to use searchable_created_at date instead of the default pg_search rank sorting.

app/services/alchemy/search/search_page.rb

@@ -6,6 +6,12 @@ module SearchPage
       def self.perform_search(params, ability: nil)
         search_results = Alchemy.search_class.search(params[:query], ability:)
         search_results = search_results&.page(params[:page])&.per(paginate_per) if paginate_per.present?
+
+        # order the documents by searchable_created_at and use the ranking order as second order argument
+        if params[:sort] == "date"
+          search_results.order_values.unshift("pg_search_documents.searchable_created_at DESC")
+        end
+
         search_results
       end
 

spec/services/alchemy/search/search_page_spec.rb

@@ -40,6 +40,29 @@
         end
       end
     end
+
+    context "sort" do
+      let(:query) { "page" }
+      let(:params) { {query:, sort:} }
+      let!(:first_page) { create(:alchemy_page, :public, published_at: "1999-08-01 00:00") }
+      let!(:second_page) { create(:alchemy_page, :public, title: "Page 2") }
+
+      context "by relevance" do
+        let(:sort) { "relevance" }
+
+        it "sorts by pg_search ranking" do
+          expect(subject.first.searchable).to eq(first_page)
+        end
+      end
+
+      context "by date" do
+        let(:sort) { "date" }
+
+        it "sorts by searchable_created_at" do
+          expect(subject.first.searchable).to eq(second_page)
+        end
+      end
+    end
   end
 
   context '#paginate_per' do