Create maven package in one transaction

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

ee/app/models/packages/package.rb

@@ -2,7 +2,9 @@
 class Packages::Package < ActiveRecord::Base
   belongs_to :project
   has_many :package_files
-  has_one :maven_metadatum
+  has_one :maven_metadatum, inverse_of: :package
+
+  accepts_nested_attributes_for :maven_metadatum
 
   validates :project, presence: true
   validates :name, presence: true

ee/app/services/packages/create_maven_package_service.rb

@@ -2,22 +2,19 @@
 module Packages
   class CreateMavenPackageService < BaseService
     def execute
-      package = project.packages.create!(
-        name: params[:name],
-        version: params[:version]
-      )
-
       app_group, _, app_name = params[:name].rpartition('/')
       app_group.tr!('/', '.')
 
-      package.create_maven_metadatum!(
+      project.packages.create!(
+        name: params[:name],
+        version: params[:version],
+        maven_metadatum_attributes: {
           path: params[:path],
           app_group: app_group,
           app_name: app_name,
           app_version: params[:version]
+        }
       )
-
-      package
     end
   end
 end