Add subject code search to course xml dump.

application/modules/courses/controllers/PublicViewController.php

@@ -15,7 +15,14 @@ class Courses_PublicViewController extends App_Controller_Action {
 	public function allCoursesAction()
     {
     	$this->_disableLayoutAndView();
-    	$courses = Courses_CourseModel::findAllActive();
+    	
+    	$subject = $this->_getParam('subject');
+    	if ($subject) {
+    	    $courses = Courses_CourseModel::findWithCriteria(array('subject' => $subject));
+    	} else {
+            $courses = Courses_CourseModel::findAllActive();
+    	}
+    	
     	$courses->orderBy('getCourseCode');
     	$dom = new DOMDocument('1.0', 'UTF-8');
     	$dom->formatOutput = true;