Fixes #1990, update to onQuestionRecordInteraction() to call model fu…

…nctions (#171)

As part of the rework in components to split model and view functions, with this code the model will be checked (when available) for the following functions:
- getResponseType()
- getResponse()
- isCorrect()

js/adapt-stateful-session.js

@@ -148,14 +148,21 @@ define([
 		},
 
 		onQuestionRecordInteraction:function(questionView) {
-			var responseType = questionView.getResponseType();
+			var responseType = typeof questionView.model.getResponseType === 'function' 
+				? questionView.model.getResponseType()
+				: questionView.getResponseType();
 
-			// if responseType doesn't contain any data, assume that the question component hasn't been set up for cmi.interaction tracking
-			if(_.isEmpty(responseType)) return;
+			// If responseType doesn't contain any data, assume that the question 
+			// component hasn't been set up for cmi.interaction tracking
+			if (_.isEmpty(responseType)) return;
 
 			var id = questionView.model.get('_id');
-			var response = questionView.getResponse();
-			var result = questionView.isCorrect();
+			var response = typeof questionView.model.getResponse === 'function'
+				? questionView.model.getResponse()
+				: questionView.getResponse();
+			var result = typeof questionView.model.isCorrect === 'function' 
+				? questionView.model.isCorrect()
+				: questionView.isCorrect();
 			var latency = questionView.getLatency();
 
 			Adapt.offlineStorage.set("interaction", id, response, result, latency, responseType);