fix: With persisted data, seeds might crash on previously added data

We fix this by explicitly setting an ID, and by allowing multiple
accounts with the demo emailaddress to exist. We then pick the first.

apps/mainsite/seeds/01_setup.py

@@ -14,8 +14,11 @@
 
 
 setattr(settings, 'SUPPRESS_EMAILS', 1)
+badgr_app_id = getattr(settings, 'BADGR_APP_ID')
+
 
 main_badgr_app, _ = BadgrApp.objects.get_or_create(
+    id=badgr_app_id,
     is_active=1,
     cors=settings.UI_URL,
     email_confirmation_redirect="{}/login/".format(settings.UI_URL),

apps/mainsite/seeds/04_badgeinstances.py

@@ -1,4 +1,3 @@
-import sys
 from django.conf import settings
 
 from badgeuser.models import BadgeUser
@@ -19,10 +18,7 @@
     REVOKED_STUDENT_EMAIL
 
 super_user = BadgeUser.objects.get(username=settings.SUPERUSER_NAME)
-badgr_app = BadgrApp.objects.first()
-if not badgr_app:
-    sys.stderr.write("No BadgrApp found. Did other seeds fail to run?")
-    sys.exit(1)
+badgr_app = BadgrApp.objects.get(id=getattr(settings, 'BADGR_APP_ID'))
 
 def create_badge_instance(user, badge_class, revoked, acceptance="Unaccepted"):
     badge_class.issue(recipient=user, created_by=super_user, allow_uppercase=True,
@@ -37,7 +33,7 @@ def create_enrollments_badge_instances(user, bc_names, revoked, acceptance="Unac
                 create_badge_instance(user, bc, revoked, acceptance)
 
 # Create enrollments
-demo_user = BadgeUser.objects.get(email=DEMO_STUDENT_EMAIL)
+demo_user = BadgeUser.objects.filter(email=DEMO_STUDENT_EMAIL).first()
 create_enrollments_badge_instances(demo_user,
                                    [BADGE_CLASS_COGNITIVE_PSYCHOLOGY, BADGE_CLASS_INTRODUCTION_TO_PSYCHOLOGY],
                                    False,