Update assessments format when serializing.

openassessment/xblock/data_conversion.py

@@ -83,9 +83,10 @@ def update_assessments_format(assessments):
         list of dict
     """
     for assessment in assessments:
-        if 'examples' in assessment:
+        if 'examples' in assessment and assessment['examples']:
             for example in assessment['examples']:
-                if isinstance(example['answer'], unicode) or isinstance(example['answer'], str):
+                if (isinstance(example, dict) and
+                    (isinstance(example['answer'], unicode) or isinstance(example['answer'], str))):
                     example['answer'] = {
                         'parts': [
                             {'text': example['answer']}

openassessment/xblock/test/test_xml.py

@@ -120,9 +120,8 @@ class TestSerializeContent(TestCase):
         self.oa_block.submission_start = data.get('submission_start')
         self.oa_block.submission_due = data.get('submission_due')
         self.oa_block.rubric_criteria = data.get('criteria', copy.deepcopy(self.BASIC_CRITERIA))
-        self.oa_block.rubric_assessments = update_assessments_format(
-            data.get('assessments', copy.deepcopy(self.BASIC_ASSESSMENTS))
-        )
+        self.oa_block.rubric_assessments = data.get('assessments', copy.deepcopy(self.BASIC_ASSESSMENTS))
+
         self.oa_block.allow_file_upload = data.get('allow_file_upload')
         self.oa_block.allow_latex = data.get('allow_latex')
         self.oa_block.leaderboard_show = data.get('leaderboard_show', 0)
@@ -231,7 +230,7 @@ class TestSerializeContent(TestCase):
     def test_mutated_assessments_dict(self):
         self._configure_xblock({})
 
-        for assessment_dict in update_assessments_format(self.BASIC_ASSESSMENTS):
+        for assessment_dict in self.BASIC_ASSESSMENTS:
             for mutated_dict in self._dict_mutations(assessment_dict):
                 self.oa_block.rubric_assessments = [mutated_dict]
                 xml = serialize_content(self.oa_block)

openassessment/xblock/xml.py

@@ -6,6 +6,7 @@ import lxml.etree as etree
 import pytz
 import dateutil.parser
 import defusedxml.ElementTree as safe_etree
+from data_conversion import update_assessments_format
 from defaults import DEFAULT_RUBRIC_FEEDBACK_TEXT
 
 
@@ -630,7 +631,7 @@ def serialize_assessments(assessments_root, oa_block):
         None
 
     """
-    for assessment_dict in oa_block.rubric_assessments:
+    for assessment_dict in update_assessments_format(oa_block.rubric_assessments):
 
         assessment = etree.SubElement(assessments_root, 'assessment')
 
@@ -760,7 +761,7 @@ def serialize_examples_to_xml_str(assessment):
         A unicode string of the XML serialized examples.
 
     """
-    examples = assessment.get('examples', [])
+    examples = update_assessments_format([assessment])[0].get('examples', [])
     if not isinstance(examples, list):
         examples = []
     examples_root = etree.Element('examples')