Move index management code to the managers.py module.

mayan/apps/document_indexing/models.py

@@ -10,7 +10,7 @@ from mptt.models import MPTTModel
 
 from documents.models import Document, DocumentType
 
-from .managers import IndexManager
+from .managers import IndexManager, IndexInstanceNodeManager
 
 
 @python_2_unicode_compatible
@@ -83,6 +83,8 @@ class IndexInstanceNode(MPTTModel):
     value = models.CharField(max_length=128, blank=True, verbose_name=_('Value'))
     documents = models.ManyToManyField(Document, related_name='node_instances', verbose_name=_('Documents'))
 
+    objects = IndexInstanceNodeManager()
+
     def __str__(self):
         return self.value