Add natural key support to the Index model.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/document_indexing/managers.py

@@ -9,8 +9,8 @@ class DocumentIndexInstanceNodeManager(models.Manager):
 
 
 class IndexManager(models.Manager):
-    def get_by_natural_key(self, name):
-        return self.get(name=name)
+    def get_by_natural_key(self, slug):
+        return self.get(slug=slug)
 
     def index_document(self, document):
         for index in self.filter(enabled=True, document_types=document.document_type):

mayan/apps/document_indexing/models.py

@@ -83,6 +83,9 @@ class Index(models.Model):
     def instance_root(self):
         return self.template_root.index_instance_nodes.get()
 
+    def natural_key(self):
+        return (self.slug,)
+
     def rebuild(self):
         """
         Delete and reconstruct the index by deleting of all its instance nodes