show both, files and file infos in acq.media API response

app/controllers/api/releases_controller.rb

@@ -45,13 +45,14 @@ class Api::ReleasesController < Api::ApiController
     if model_name == "acquired_media_release"
       mapping = {
         "#{model_name.camelize}": SerializableAcquiredMediaRelease,
+        FileInfo: SerializableFileInfo,
         "ActiveStorage::Attachment".to_sym => ActiveStorage::SerializableAttachment,
       }
 
       render jsonapi: release,
            status: status,
            class: mapping,
-           include: [:files]
+           include: [:files, :file_infos]
     else
       mapping = {
         "#{model_name.camelize}": show_serializable,

app/serializers/serializable_acquired_media_release.rb

@@ -8,6 +8,16 @@ class SerializableAcquiredMediaRelease < JSONAPI::Serializable::Resource
               :applicable_medium_id, :applicable_medium_text, :territory_id, :territory_text, :term_id, :term_text,
               :restriction_id, :restriction_text, :categories, :description, :tag_list
 
+  has_many :file_infos do
+    data do
+      @object.file_infos
+    end
+
+    meta do
+      { count: @object.file_infos.size }
+    end
+  end
+
   has_many :files do
     data do
       @object.files

spec/controllers/api/acquired_media_releases_controller_spec.rb

@@ -37,7 +37,7 @@ RSpec.describe Api::AcquiredMediaReleasesController, type: :controller do
       sign_in_to_api(current_user)
       get :show, params: { id: tested_release.id }
 
-      expect(response.body).not_to match /file_infos/
+      expect(response.body).to match /file_infos/
       expect(response.body).to match /files/
     end
   end