Fix graph now that CircuitTermination.interface doesn't exist anymore

Note: it shouldn't have existed because of `related_name='+'` in the
first place, but it did…

netbox/dcim/migrations/0071_auto_20190612_1730.py

@@ -0,0 +1,19 @@
+# Generated by Django 2.2.2 on 2019-06-12 17:30
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dcim', '0070_auto_20190612_1801'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='interface',
+            name='_connected_circuittermination',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='circuits.CircuitTermination'),
+        ),
+    ]

netbox/dcim/models.py

@@ -1949,7 +1949,6 @@ class Interface(CableTermination, ComponentModel):
     _connected_circuittermination = models.ForeignKey(
         to='circuits.CircuitTermination',
         on_delete=models.SET_NULL,
-        related_name='+',
         blank=True,
         null=True
     )

netbox/extras/models.py

@@ -533,27 +533,20 @@ class TopologyMap(models.Model):
 
     def add_network_connections(self, devices):
 
-        from circuits.models import CircuitTermination
         from dcim.models import Interface
 
         # Add all interface connections to the graph
-        connected_interfaces = Interface.objects.select_related(
-            '_connected_interface__device'
-        ).filter(
-            Q(device__in=devices) | Q(_connected_interface__device__in=devices),
-            _connected_interface__isnull=False,
-            pk__lt=F('_connected_interface')
-        )
+        connected_interfaces = Interface.objects.exclude(cable=None)
+        seen = set()
         for interface in connected_interfaces:
+            if interface in seen:
+                continue
             style = 'solid' if interface.connection_status == CONNECTION_STATUS_CONNECTED else 'dashed'
-            self.graph.edge(interface.device.name, interface.connected_endpoint.device.name, style=style)
-
-        # Add all circuits to the graph
-        for termination in CircuitTermination.objects.filter(term_side='A', connected_endpoint__device__in=devices):
-            peer_termination = termination.get_peer_termination()
-            if (peer_termination is not None and peer_termination.interface is not None and
-                    peer_termination.interface.device in devices):
-                self.graph.edge(termination.interface.device.name, peer_termination.interface.device.name, color='blue')
+            trace = interface.trace(follow_circuits=True)
+            endpoint = trace[-1][2]
+            if endpoint and endpoint.device in devices:
+                self.graph.edge(interface.device.name, endpoint.device.name, style=style)
+                seen.add(endpoint)
 
     def add_console_connections(self, devices):