Add resource and test for latest PublishedDatabase.

app/controllers/published_databases_controller.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+# Controller for the PublishedDatabase resource.
+class PublishedDatabasesController < ApplicationController
+  def index
+    add_total_stat(params)
+    published_databases = PublishedDatabaseResource.all(params)
+    respond_with(published_databases)
+  end
+
+  def add_total_stat(params)
+    # don't return stats
+  end
+end

app/resources/published_database_resource.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+# Public resource for the PublishedDatabase object.
+class PublishedDatabaseResource < ApplicationResource
+  primary_endpoint '/published_databases', [:index]
+
+  attribute :url, :string
+  attribute :updated_at, :datetime
+  attribute :created_at, :datetime
+
+  def base_scope
+    latest_id = PublishedDatabase.order(created_at: :desc).select(:id).limit(1)
+    PublishedDatabase.where(id: latest_id)
+  end
+
+  # Only return the latest database.
+  def default_page_size
+    1
+  end
+end

config/routes.rb

@@ -18,6 +18,7 @@
     resources :formats, only: %i[index show]
     resources :illustrators, only: %i[index show]
     resources :printings, only: %i[index show]
+    resources :published_databases, only: [:index]
     resources :restrictions, only: %i[index show]
     resources :reviews, only: %i[index show]
     resources :rulings, only: %i[index show]

spec/resources/published_database_resource_reads_spec.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe PublishedDatabaseResource, type: :resource do
+  describe 'serialization' do
+    fixtures :published_databases
+
+    let(:new_db) { published_databases(:latest_db) }
+
+    it 'works and only returns the latest database' do
+      render
+      data = jsonapi_data
+
+      expect(data.length).to eq(1)
+
+      record = data[0]
+      expect(record.url).to eq(new_db.url)
+      expect(Time.parse(record.created_at).to_i).to eq(new_db.created_at.to_i)
+      expect(record.jsonapi_type).to eq('published_databases')
+    end
+  end
+end