Fix refresh_course_metadata for subjects and lang.

course_discovery/apps/course_metadata/data_loaders/marketing_site.py

@@ -141,6 +141,10 @@ class SubjectMarketingSiteDataLoader(AbstractMarketingSiteDataLoader):
 
     def process_node(self, data):
         slug = data['field_subject_url_slug']
+        if ('language' not in data) or (data['language'] == 'und'):
+            language_code = 'en'
+        else:
+            language_code = data['language']
         defaults = {
             'uuid': data['uuid'],
             'name': data['title'],
@@ -149,17 +153,17 @@ class SubjectMarketingSiteDataLoader(AbstractMarketingSiteDataLoader):
             'card_image_url': self._get_nested_url(data.get('field_subject_card_image')),
             # NOTE (CCB): This is not a typo. Yes, the banner image for subjects is in a field with xseries in the name.
             'banner_image_url': self._get_nested_url(data.get('field_xseries_banner_image'))
-
         }
 
         # There is a bug with django-parler when using django's update_or_create() so we manually update or create.
         try:
             subject = Subject.objects.get(slug=slug, partner=self.partner)
+            subject.set_current_language(language_code)
             for key, value in defaults.items():
                 setattr(subject, key, value)
             subject.save()
         except Subject.DoesNotExist:
-            new_values = {'slug': slug, 'partner': self.partner}
+            new_values = {'slug': slug, 'partner': self.partner, '_current_language': language_code}
             new_values.update(defaults)
             subject = Subject(**new_values)
             subject.save()

course_discovery/apps/course_metadata/data_loaders/tests/mock_data.py

@@ -945,6 +945,7 @@ MARKETING_SITE_API_SUBJECT_BODIES = [
         'field_subject_card_image': {
             'url': 'https://www.edx.org/sites/default/files/subject/image/card/math.jpg',
         },
+        'language': 'en',  # language is intentionally added to only one of these.
         'type': 'subject',
         'title': 'Math',
         'url': 'https://www.edx.org/course/subject/math',