Fixed the documents app and updated to latest app registry api

apps/documents/managers.py

@@ -1,6 +1,7 @@
 from __future__ import absolute_import
 
 from ast import literal_eval
+from datetime import datetime
 
 from django.db import models
 
@@ -24,3 +25,23 @@ class DocumentPageTransformationManager(models.Manager):
                 warnings.append(e)
 
         return transformations, warnings
+
+
+class RecentDocumentManager(models.Manager):
+    def add_document_for_user(self, user, document):
+        from .settings import RECENT_COUNT
+
+        if user.is_authenticated():
+            self.model.objects.filter(user=user, document=document).delete()
+            new_recent = self.model(user=user, document=document, datetime_accessed=datetime.now())
+            new_recent.save()
+            to_delete = self.model.objects.filter(user=user)[RECENT_COUNT:]
+            for recent_to_delete in to_delete:
+                recent_to_delete.delete()
+
+    def get_for_user(self, user):
+        document_model = models.get_model('documents', 'Document')
+        if user.is_authenticated():
+            return document_model.objects.filter(recentdocument__user=user)
+        else:
+            return []