Context Navigation

Changes between Version 1 and Version 2 of Ticket #27311

-              v1
+              v2
 {{{
 def generate_invoices(apps, schema_editor):
     Payment = apps.get_model('finance', 'Payment')
     Invoice = apps.get_model('finance', 'Invoice')
+    A = apps.get_model('app1', 'A')
+    B = apps.get_model('app1', 'B')
     User = apps.get_model('accounts', 'User')
     payment = Payment.objects.last()
+    a = A.objects.last()
     invoice = Invoice(
         client=payment.user),
+    b = B(
+        client=a.user),
         status=5
+    )
 …
 {{{
     invoice = Invoice(
         client=User.objects.get(pk=payment.user.pk),
+    b = B(
+        client=User.objects.get(pk=a.user.pk),
         status=5
+    )
 …
 In both cases I get the error:
 {{{
 Cannot assign "<User: Some Client>": "Invoice.client" must be a "User" instance.
+Cannot assign "<User: Some User>": "B.client" must be a "User" instance.
 }}}