From 2213c4dd3df4c4efb70657aacbacf15b86d13d57 Mon Sep 17 00:00:00 2001
From: Michael Terry <mterry@edx.org>
Date: Tue, 26 Nov 2019 13:43:40 -0500
Subject: [PATCH] Support courses with only a verified mode

---
 lms/djangoapps/courseware/views/views.py   | 23 ++++++++++++----------
 lms/templates/courseware/course_about.html |  2 +-
 2 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/lms/djangoapps/courseware/views/views.py b/lms/djangoapps/courseware/views/views.py
index 33dff1d60c..a51399d194 100644
--- a/lms/djangoapps/courseware/views/views.py
+++ b/lms/djangoapps/courseware/views/views.py
@@ -905,15 +905,18 @@ def course_about(request, course_id):
         ecommerce_checkout = ecomm_service.is_enabled(request.user)
         ecommerce_checkout_link = ''
         ecommerce_bulk_checkout_link = ''
-        professional_mode = None
-        is_professional_mode = CourseMode.PROFESSIONAL in modes or CourseMode.NO_ID_PROFESSIONAL_MODE in modes
-        if ecommerce_checkout and is_professional_mode:
-            professional_mode = modes.get(CourseMode.PROFESSIONAL, '') or \
-                modes.get(CourseMode.NO_ID_PROFESSIONAL_MODE, '')
-            if professional_mode.sku:
-                ecommerce_checkout_link = ecomm_service.get_checkout_page_url(professional_mode.sku)
-            if professional_mode.bulk_sku:
-                ecommerce_bulk_checkout_link = ecomm_service.get_checkout_page_url(professional_mode.bulk_sku)
+        single_paid_mode = None
+        if ecommerce_checkout:
+            if len(modes) == 1 and list(modes.values())[0].min_price:
+                single_paid_mode = list(modes.values())[0]
+            else:
+                # have professional ignore other modes for historical reasons
+                single_paid_mode = modes.get(CourseMode.PROFESSIONAL)
+
+            if single_paid_mode and single_paid_mode.sku:
+                ecommerce_checkout_link = ecomm_service.get_checkout_page_url(single_paid_mode.sku)
+            if single_paid_mode and single_paid_mode.bulk_sku:
+                ecommerce_bulk_checkout_link = ecomm_service.get_checkout_page_url(single_paid_mode.bulk_sku)
 
         registration_price, course_price = get_course_prices(course)
 
@@ -964,7 +967,7 @@ def course_about(request, course_id):
             'ecommerce_checkout': ecommerce_checkout,
             'ecommerce_checkout_link': ecommerce_checkout_link,
             'ecommerce_bulk_checkout_link': ecommerce_bulk_checkout_link,
-            'professional_mode': professional_mode,
+            'single_paid_mode': single_paid_mode,
             'reg_then_add_to_cart_link': reg_then_add_to_cart_link,
             'show_courseware_link': show_courseware_link,
             'is_course_full': is_course_full,
diff --git a/lms/templates/courseware/course_about.html b/lms/templates/courseware/course_about.html
index cb999d8546..293084de57 100644
--- a/lms/templates/courseware/course_about.html
+++ b/lms/templates/courseware/course_about.html
@@ -164,7 +164,7 @@ from six import string_types
               reg_href = ecommerce_checkout_link
             else:
               reg_href="#"
-            if professional_mode:
+            if single_paid_mode:
               href_class = "add-to-cart"
             else:
               href_class = "register"