Move logic into view.py for whether user is enrolled.

lms/djangoapps/courseware/views.py

@@ -250,12 +250,17 @@ def course_info(request, course_id):
     course = check_course(course_id)
 
     return render_to_response('info.html', {'course': course})
-    
+
 @ensure_csrf_cookie
 def course_about(request, course_id):
+    def registered_for_course(course, user):
+        if user.is_authenticated():
+            return CourseEnrollment.objects.filter(user = user, course_id=course.id).exists()
+        else:
+            return False
     course = check_course(course_id, course_must_be_open=False)
-
-    return render_to_response('portal/course_about.html', {'course': course})
+    registered = registered_for_course(course, request.user)
+    return render_to_response('portal/course_about.html', {'course': course, 'registered': registered})
 
 
 @login_required

lms/templates/portal/course_about.html

 <%! from django.core.urlresolvers import reverse %>
-<%! from student.models import CourseEnrollment %>
 <%namespace name='static' file='../static_content.html'/>
 <%block name="js_extra">
   <script src="${static.url('js/course_info.js')}"></script>
@@ -17,10 +16,10 @@
 
         <div class="main-cta">
           %if user.is_authenticated():
-            %if not CourseEnrollment.objects.filter(user=user, course_id=course.id).exists():
-                <a href="${reverse('enroll', args=[course.id])}" class="register">Register</a>
-            %else:
+            %if registered:
                 <span class="register disabled">Registered</span>
+            %else:
+                <a href="${reverse('enroll', args=[course.id])}" class="register">Register</a>
             %endif
           %else:
             <a href="#signup-modal" class="register" rel="leanModal" data-notice="You must register in order to enroll">Register</a>