Handle legacy problem definitions

openassessment/xblock/openassessmentblock.py

@@ -126,7 +126,7 @@ class OpenAssessmentBlock(MessageMixin,
         help="ISO-8601 formatted string representing the submission due date."
     )
 
-    text_response = String(
+    text_response_raw = String(
         help="Specify whether learners must include a text based response to this problem's prompt.",
         default="required",
         scope=Scope.settings
@@ -245,6 +245,24 @@ class OpenAssessmentBlock(MessageMixin,
         return self._serialize_opaque_key(self.xmodule_runtime.course_id)  # pylint:disable=E1101
 
     @property
+    def text_response(self):
+        """
+        Backward compatibility for existing blocks that were created without text_response
+        or file_upload_response fields. These blocks will be treated as required text.
+        """
+        if not self.file_upload_response and not self.text_response_raw:
+            return 'required'
+        else:
+            return self.text_response_raw
+
+    @text_response.setter
+    def text_response(self, value):
+        """
+        Setter for text_response_raw
+        """
+        self.text_response_raw = value if value else None
+
+    @property
     def file_upload_response(self):
         """
         Backward compatibility for existing block before that were created without

openassessment/xblock/test/data/neither_response_type.xml

+<openassessment>
+    <title>Open Assessment Test</title>
+    <prompts>
+        <prompt>
+            <description>Given the state of the world today, what do you think should be done to combat poverty? Please answer in a short essay of 200-300 words.</description>
+        </prompt>
+    </prompts>
+    <rubric>
+        <criterion>
+            <name>Concise</name>
+            <prompt>How concise is it?</prompt>
+            <option points="0">
+                <name>Neal Stephenson (late)</name>
+                <explanation>Neal Stephenson explanation</explanation>
+            </option>
+            <option points="1">
+                <name>HP Lovecraft</name>
+                <explanation>HP Lovecraft explanation</explanation>
+            </option>
+        </criterion>
+    </rubric>
+    <assessments>
+        <assessment name="peer-assessment" must_grade="1" must_be_graded_by="1" />
+        <assessment name="self-assessment" />
+    </assessments>
+</openassessment>

openassessment/xblock/test/test_openassessment.py

@@ -452,6 +452,13 @@ class TestOpenAssessment(XBlockHandlerTestCase):
         xblock.prompts = [{'description': 'Prompt 4.'}, {'description': 'Prompt 5.'}]
         self.assertEqual(xblock.prompt, '[{"description": "Prompt 4."}, {"description": "Prompt 5."}]')
 
+    @scenario('data/neither_response_type.xml')
+    def test_no_response_type(self, xblock):
+        """
+        Ensure that legacy courses will still load properly.
+        """
+        self.assertEqual(xblock.text_response, 'required')
+
 
 class TestDates(XBlockHandlerTestCase):