Add termination FKs on Circuit model

netbox/circuits/migrations/0028_cache_circuit_terminations.py

@@ -0,0 +1,37 @@
+import sys
+
+from django.db import migrations
+
+
+def cache_circuit_terminations(apps, schema_editor):
+    Circuit = apps.get_model('circuits', 'Circuit')
+    CircuitTermination = apps.get_model('circuits', 'CircuitTermination')
+
+    if 'test' not in sys.argv:
+        print(f"\n    Caching circuit terminations...", flush=True)
+
+    a_terminations = {
+        ct.circuit_id: ct.pk for ct in CircuitTermination.objects.filter(term_side='A')
+    }
+    z_terminations = {
+        ct.circuit_id: ct.pk for ct in CircuitTermination.objects.filter(term_side='Z')
+    }
+    for circuit in Circuit.objects.all():
+        Circuit.objects.filter(pk=circuit.pk).update(
+            termination_a_id=a_terminations.get(circuit.pk),
+            termination_z_id=z_terminations.get(circuit.pk),
+        )
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('circuits', '0027_cloud'),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            code=cache_circuit_terminations,
+            reverse_code=migrations.RunPython.noop
+        ),
+    ]