diff --git a/apps/metadata/models.py b/apps/metadata/models.py
index 5e13f65c48..93aeb921df 100644
--- a/apps/metadata/models.py
+++ b/apps/metadata/models.py
@@ -98,3 +98,18 @@ class DocumentTypeDefaults(models.Model):
     class Meta:
         verbose_name = _(u'document type defaults')
         verbose_name_plural = _(u'document types defaults')
+
+
+def document_metadata_values(document):
+    return DocumentMetadata.objects.filter(document=document).values_list('value', flat=True)
+
+
+def document_metadata_values_string(document):
+    return u' '.join(document_metadata_values(document))
+
+
+def document_metadata_dict_list(document):
+    return [{name: value} for name, value in DocumentMetadata.objects.filter(document=document).values_list('metadata_type__name', 'value')]
+
+
+Document.add_to_class('metadata_values_string', document_metadata_values_string)