BOM-240

Fixing python3. Hashvalues were saving with b prefix in db. Decoded them before insertion.

lms/djangoapps/grades/models.py

@@ -20,6 +20,7 @@ import six
 from django.apps import apps
 from django.contrib.auth.models import User
 from django.db import models
+from django.utils.encoding import python_2_unicode_compatible
 from django.utils.timezone import now
 from lazy import lazy
 from model_utils.models import TimeStampedModel
@@ -79,7 +80,7 @@ class BlockRecordList(object):
         supported by adding a label indicated which algorithm was used, e.g.,
         "sha256$j0NDRmSPa5bfid2pAcUXaxCm2Dlh3TwayItZstwyeqQ=".
         """
-        return b64encode(sha1(self.json_value.encode('utf-8')).digest())
+        return b64encode(sha1(self.json_value.encode('utf-8')).digest()).decode('utf-8')
 
     @lazy
     def json_value(self):
@@ -128,6 +129,7 @@ class BlockRecordList(object):
         return cls(blocks, course_key)
 
 
+@python_2_unicode_compatible
 class VisibleBlocks(models.Model):
     """
     A django model used to track the state of a set of visible blocks under a
@@ -148,7 +150,7 @@ class VisibleBlocks(models.Model):
     class Meta(object):
         app_label = "grades"
 
-    def __unicode__(self):
+    def __str__(self):
         """
         String representation of this model.
         """