diff --git a/.gems b/.gems
index 46b3c8d..b8f1f13 100644
--- a/.gems
+++ b/.gems
@@ -1,2 +1,2 @@
 sbfaulkner-sinatra-helpers -s http://gems.github.com
-
+dm-core --version '>= 1.0.0'
diff --git a/lib/models.rb b/lib/models.rb
index 1f9baa7..0fee30c 100644
--- a/lib/models.rb
+++ b/lib/models.rb
@@ -19,7 +19,7 @@ class Payment
   
   belongs_to :service
   belongs_to :supplier
-  belongs_to :directorate, { :through => :service }
+  has 1, :directorate, { :through => :service }
 
   def url
     SITE_URL + "payments/" + @id.to_s