Fix setup of the kfet generic user when…

…a specific migration is targeted.

kfet/auth/apps.py

@@ -10,5 +10,22 @@ class KFetAuthConfig(AppConfig):
 
     def ready(self):
         from . import signals  # noqa
-        from .utils import setup_kfet_generic_user
-        post_migrate.connect(setup_kfet_generic_user, sender=self)
+        post_migrate.connect(finish_setup_kfet_generic_user, sender=self)
+
+
+def finish_setup_kfet_generic_user(sender, apps, **kwargs):
+    from kfet.models import Account
+    from .utils import setup_kfet_generic_user
+    # Even if no kfetauth migration has been applied, the post_migrate signal
+    # is issued for KFetAuthConfig.
+    # Before finishing setup of the kfet generic user, check dependencies are
+    # ready: kfet.Account model and gestion.Profile (old schema may not use
+    # this model).
+    try:
+        apps.get_model('kfet', 'Account')
+        apps.get_model('gestion', 'Profile')
+        Account.objects.get_generic()
+    except (LookupError, Account.DoesNotExist):
+        return
+
+    setup_kfet_generic_user()

kfet/auth/utils.py

@@ -15,7 +15,7 @@ def get_kfet_generic_user():
     return Account.objects.get_generic().user
 
 
-def setup_kfet_generic_user(**kwargs):
+def setup_kfet_generic_user():
     """
     First steps of setup of the kfet generic user are done in a migration, as
     it is more robust against database schema changes.