From 28e17d0d7178b26a926085d74ea9b3ae62d88a3d Mon Sep 17 00:00:00 2001
From: Martin Meyerhoff <mamhoff@gmail.com>
Date: Fri, 8 May 2020 11:07:07 +0200
Subject: [PATCH] Add Language Serializer

This allows us to side-load the menu items belonging to a page by doing:

GET /jsonapi/pages?include=language.menu_items
---
 .../alchemy/json_api/language_serializer.rb   | 28 ++++++++++
 .../alchemy/json_api/page_serializer.rb       |  2 +
 .../json_api/language_serializer_spec.rb      | 55 +++++++++++++++++++
 .../alchemy/json_api/page_serializer_spec.rb  |  1 +
 4 files changed, 86 insertions(+)
 create mode 100644 app/serializers/alchemy/json_api/language_serializer.rb
 create mode 100644 spec/serializers/alchemy/json_api/language_serializer_spec.rb

diff --git a/app/serializers/alchemy/json_api/language_serializer.rb b/app/serializers/alchemy/json_api/language_serializer.rb
new file mode 100644
index 0000000..db78981
--- /dev/null
+++ b/app/serializers/alchemy/json_api/language_serializer.rb
@@ -0,0 +1,28 @@
+module Alchemy
+  module JsonApi
+    class LanguageSerializer
+      include FastJsonapi::ObjectSerializer
+      attributes(
+        :name,
+        :language_code,
+        :country_code,
+        :locale
+      )
+
+      has_many :menu_items, record_type: :node, serializer: NodeSerializer, id_method_name: :node_ids
+      has_many :menus, record_type: :node, serializer: NodeSerializer do |language|
+        language.nodes.select { |n| n.parent.nil? }
+      end
+      has_many :pages
+      has_one :root_page, record_type: :page, serializer: PageSerializer do |language|
+        language.root_page
+      end
+
+      with_options if: -> (_, params) { params[:admin] == true } do
+        attribute :created_at
+        attribute :updated_at
+        attribute :public
+      end
+    end
+  end
+end
diff --git a/app/serializers/alchemy/json_api/page_serializer.rb b/app/serializers/alchemy/json_api/page_serializer.rb
index d884b7e..faa82f0 100644
--- a/app/serializers/alchemy/json_api/page_serializer.rb
+++ b/app/serializers/alchemy/json_api/page_serializer.rb
@@ -14,6 +14,8 @@ class PageSerializer
         :updated_at,
       )
 
+      belongs_to :language
+
       has_many :elements
       has_many :all_elements, record_type: :element, serializer: ElementSerializer
 
diff --git a/spec/serializers/alchemy/json_api/language_serializer_spec.rb b/spec/serializers/alchemy/json_api/language_serializer_spec.rb
new file mode 100644
index 0000000..763f06d
--- /dev/null
+++ b/spec/serializers/alchemy/json_api/language_serializer_spec.rb
@@ -0,0 +1,55 @@
+require "rails_helper"
+require "alchemy/test_support/factories/language_factory"
+require "alchemy/test_support/factories/page_factory"
+require "alchemy/test_support/factories/node_factory"
+
+RSpec.describe Alchemy::JsonApi::LanguageSerializer do
+  let(:language) do
+    FactoryBot.create(
+      :alchemy_language,
+      country_code: "DE",
+      language_code: "de"
+    )
+  end
+  let(:options) { {} }
+
+  subject(:serializer) { described_class.new(language, options) }
+
+  describe "#to_serializable_hash" do
+    subject { serializer.serializable_hash }
+
+    it "has the right keys and values" do
+      attributes = subject[:data][:attributes]
+      expect(attributes[:name]).to eq("Deutsch")
+      expect(attributes[:language_code]).to eq("de")
+      expect(attributes[:country_code]).to eq("DE")
+      expect(attributes[:locale]).to eq("de")
+    end
+
+    context "with admin set to true" do
+      let(:options) { {params: {admin: true}} }
+
+      it "includes admin-only attributes" do
+        attributes = subject[:data][:attributes]
+        expect(attributes[:created_at]).to be_present
+        expect(attributes[:updated_at]).to be_present
+        expect(attributes[:public]).to be true
+      end
+    end
+  end
+
+  describe "relationships" do
+    let!(:root_page) { FactoryBot.create(:alchemy_page, :language_root, language: language) }
+    let!(:menu) { FactoryBot.create(:alchemy_node, language: language) }
+    let!(:menu_node) { FactoryBot.create(:alchemy_node, language: language, parent: menu) }
+
+    subject { serializer.serializable_hash[:data][:relationships] }
+
+    it "has the right keys and values" do
+      expect(subject[:root_page]).to eq(data: { id: root_page.id.to_s, type: :page })
+      expect(subject[:pages]).to eq(data: [{ id: root_page.id.to_s, type: :page }])
+      expect(subject[:menus]).to eq(data: [{ id: menu.id.to_s, type: :node }])
+      expect(subject[:menu_items]).to eq(data: [{ id: menu.id.to_s, type: :node }, { id: menu_node.id.to_s, type: :node}])
+    end
+  end
+end
diff --git a/spec/serializers/alchemy/json_api/page_serializer_spec.rb b/spec/serializers/alchemy/json_api/page_serializer_spec.rb
index bf24413..c9af953 100644
--- a/spec/serializers/alchemy/json_api/page_serializer_spec.rb
+++ b/spec/serializers/alchemy/json_api/page_serializer_spec.rb
@@ -62,6 +62,7 @@
     it "has the right keys and values" do
       expect(subject[:elements]).to eq(data: [{ id: element.id.to_s, type: :element }])
       expect(subject[:all_elements]).to eq(data: [{ id: element.id.to_s, type: :element }])
+      expect(subject[:language]).to eq(data: { id: page.language_id.to_s, type: :language })
     end
   end
 end