Model.save() errors are being silently ignored by Django REST Framework.

Force raising a ValidationError on Model.save() errors.
GitLab issue #348 and #349.

mayan/apps/documents/serializers.py

@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 from rest_framework import serializers
+from rest_framework.serializers import ValidationError
 
 from common.models import SharedUploadedFile
 
@@ -81,6 +82,16 @@ class DocumentVersionSerializer(serializers.HyperlinkedModelSerializer):
         model = DocumentVersion
         read_only_fields = ('document', 'file')
 
+    def update(self, instance, validated_data):
+        try:
+            super(DocumentVersionSerializer, self).update(
+                instance, validated_data
+            )
+        except Exception as exception:
+            raise ValidationError(unicode(exception))
+
+        return instance
+
 
 class DocumentVersionRevertSerializer(DocumentVersionSerializer):
     class Meta(DocumentVersionSerializer.Meta):