Merge pull request #688 from edx/waheed/tnl1758-fix-training-example-answer-format-into-dict

Fixed training example answer format for old submissions.

openassessment/assessment/data_conversion.py

+"""
+Data Conversion utility methods for handling assessment data transformations.
+
+"""
+import json
+
+
+def update_training_example_answer_format(answer):
+    """
+    For each training example update 'answer' to newer format.
+
+    Args:
+        answer unicode string or dict
+    Returns:
+        dict
+    """
+    if isinstance(answer, unicode) or isinstance(answer, str):
+        return {
+            'parts': [
+                {'text': answer}
+            ]
+        }
+
+    return answer

openassessment/assessment/serializers/training.py

@@ -4,6 +4,7 @@ Serializers for the training assessment type.
 from django.core.cache import cache
 from django.db import transaction, IntegrityError
 from openassessment.assessment.models import TrainingExample
+from openassessment.assessment.data_conversion import update_training_example_answer_format
 from .base import rubric_from_dict, RubricSerializer
 
 
@@ -58,7 +59,7 @@ def serialize_training_example(example):
     example_dict = cache.get(cache_key)
     if example_dict is None:
         example_dict = {
-            'answer': example.answer,
+            'answer': update_training_example_answer_format(example.answer),
             'options_selected': example.options_selected_dict,
             'rubric': RubricSerializer.serialized_from_cache(example.rubric),
         }