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
+        FileInfo: SerializableFileInfo,
+        "ActiveStorage::Attachment".to_sym => ActiveStorage::SerializableAttachment,
       }
 
       render jsonapi: release,
            status: status,
            class: mapping,
-           include: [:file_infos]
+           include: [:files, :file_infos]
     else
       mapping = {
         "#{model_name.camelize}": show_serializable,

app/serializers/serializable_acquired_media_release.rb

@@ -17,4 +17,14 @@ class SerializableAcquiredMediaRelease < JSONAPI::Serializable::Resource
       { count: @object.file_infos.size }
     end
   end
+
+  has_many :files do
+    data do
+      @object.files
+    end
+
+    meta do
+      { count: @object.files.size }
+    end
+  end
 end

spec/controllers/api/acquired_media_releases_controller_spec.rb

@@ -30,6 +30,16 @@ RSpec.describe Api::AcquiredMediaReleasesController, type: :controller do
 
       expect(response).to be_successful
     end
+
+    it 'contains files attachment data' do
+      tested_release = create(:acquired_media_release, name: 'ct1', project_id: project.id)
+
+      sign_in_to_api(current_user)
+      get :show, params: { id: tested_release.id }
+
+      expect(response.body).to match /file_infos/
+      expect(response.body).to match /files/
+    end
   end
 
   describe '#create' do