Include child locations in rack/device lists for location floorplans

A floorplan attached to a parent location previously offered no racks or
devices to place when they are assigned to its child locations, which is
the common case for a datacenter location split into rooms/rows. Filter
on the location's descendants (including itself) instead of an exact
location match.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: Bastien

netbox_floorplan/views.py

@@ -119,7 +119,7 @@ def get(self, request):
                 site=fp_instance.site.id).order_by("name")
         else:
             self.queryset = Rack.objects.all().select_related("role").filter(~Q(id__in=fp_instance.mapped_racks)).filter(
-                location=fp_instance.location.id).order_by("name")
+                location__in=fp_instance.location.get_descendants(include_self=True)).order_by("name")
         return super().get(request)
 
 
@@ -135,7 +135,7 @@ def get(self, request):
                 site=fp_instance.site.id, rack=None).order_by("name")
         else:
             self.queryset = Device.objects.all().filter(~Q(id__in=fp_instance.mapped_devices)).filter(
-                location=fp_instance.location.id, rack=None).order_by("name")
+                location__in=fp_instance.location.get_descendants(include_self=True), rack=None).order_by("name")
         return super().get(request)