Moved DocumentQueueManager to a separate manager.py file

apps/ocr/manager.py

@@ -0,0 +1,13 @@
+from django.db import models
+
+from ocr.exceptions import AlreadyQueued
+
+class DocumentQueueManager(models.Manager):
+    def queue_document(self, document, queue_name='default'):
+        document_queue = self.model.objects.get(name=queue_name)
+        if document_queue.queuedocument_set.filter(document=document):
+            raise AlreadyQueued
+
+        document_queue.queuedocument_set.create(document=document, delay=True)
+
+        return document_queue