Add an EssencePageSerializer

This was missing from the essence serializers

app/serializers/alchemy/json_api/essence_page_serializer.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+require "alchemy/json_api/essence_serializer"
+
+module Alchemy::JsonApi
+  class EssencePageSerializer
+    include EssenceSerializer
+
+    attribute :ingredient do |essence|
+      essence.page&.url_path
+    end
+
+    attribute :page_name do |essence|
+      essence.page&.name
+    end
+
+    attribute :page_url do |essence|
+      essence.page&.url_path
+    end
+
+    has_one :page, record_type: :page, serializer: PageSerializer
+  end
+end

spec/serializers/alchemy/json_api/essence_page_serializer_spec.rb

@@ -0,0 +1,72 @@
+# frozen_string_literal: true
+require "rails_helper"
+require "alchemy/test_support/factories/content_factory"
+require "alchemy/test_support/factories/essence_page_factory"
+
+RSpec.describe Alchemy::JsonApi::EssencePageSerializer do
+  let(:element) { FactoryBot.create(:alchemy_element) }
+  let(:content) { FactoryBot.create(:alchemy_content, element: element) }
+  let(:page) { FactoryBot.create(:alchemy_page) }
+  let(:essence) do
+    FactoryBot.create(
+      :alchemy_essence_page,
+      content: content,
+      page: page,
+    )
+  end
+  let(:options) { {} }
+
+  let(:serializer) { described_class.new(essence, options) }
+
+  it_behaves_like "an essence"
+
+  subject { serializer.serializable_hash[:data][:attributes] }
+
+  describe "attributes" do
+    it "has page url as ingredient" do
+      expect(subject[:ingredient]).to eq(page.url_path)
+    end
+
+    it "has page_name" do
+      expect(subject[:page_name]).to eq(page.name)
+    end
+
+    it "has page_url" do
+      expect(subject[:page_url]).to eq(page.url_path)
+    end
+  end
+
+  describe "relationships" do
+    subject { serializer.serializable_hash[:data][:relationships] }
+
+    it "has page object" do
+      expect(subject[:page]).to eq(data: { id: page.id.to_s, type: :page })
+    end
+  end
+
+  context "With no page set" do
+    let(:essence) do
+      FactoryBot.create(
+        :alchemy_essence_page,
+        content: content,
+        page: nil,
+      )
+    end
+
+    it_behaves_like "an essence"
+
+    describe "attributes" do
+      it "has no ingredient" do
+        expect(subject[:ingredient]).to be_nil
+      end
+
+      it "has no page_name" do
+        expect(subject[:page_name]).to be_nil
+      end
+
+      it "has no page_url" do
+        expect(subject[:page_url]).to be_nil
+      end
+    end
+  end
+end