Add searchable_created_at field to pg_search_documents table

Add an additional timestamp to pg_search_documents table to store the created_at of the page. This timestamp is interesting, if the documents are order or filtered by time.

app/extensions/alchemy/pg_search/page_extension.rb

@@ -10,7 +10,7 @@ def self.prepended(base)
         :meta_keywords,
         :name,
       ],
-      additional_attributes: ->(page) { { page_id: page.id } },
+      additional_attributes: ->(page) { { page_id: page.id, searchable_created_at: page.published_at } },
       if: :searchable?,
     )
   end

db/migrate/20241105092236_add_document_created_at_to_pg_search_documents.rb

@@ -0,0 +1,6 @@
+class AddDocumentCreatedAtToPgSearchDocuments < ActiveRecord::Migration[7.1]
+  def change
+    add_column :pg_search_documents, :searchable_created_at, :datetime, if_not_exists: true
+    add_index :pg_search_documents, :searchable_created_at, if_not_exists: true
+  end
+end

spec/dummy/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2024_10_08_083843) do
+ActiveRecord::Schema[7.1].define(version: 2024_11_06_130317) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -256,7 +256,9 @@
     t.datetime "updated_at", null: false
     t.bigint "page_id"
     t.virtual "searchable_content", type: :tsvector, as: "to_tsvector('simple'::regconfig, COALESCE(content, ''::text))", stored: true
+    t.datetime "searchable_created_at"
     t.index ["page_id"], name: "index_pg_search_documents_on_page_id"
+    t.index ["searchable_created_at"], name: "index_pg_search_documents_on_searchable_created_at"
     t.index ["searchable_type", "searchable_id"], name: "index_pg_search_documents_on_searchable"
   end
 

spec/models/page_spec.rb

@@ -69,4 +69,14 @@
       end
     end
   end
+
+  describe "additional_attributes" do
+    it "stores page_id" do
+      expect(page.pg_search_document.page_id).to eq(page.id)
+    end
+
+    it "stores searchable created_at" do
+      expect(page.pg_search_document.searchable_created_at).to eq(page.published_at)
+    end
+  end
 end