CNS location

- Add a parameter to filter for locations with no monitors
	- Also filter for monitors without paitents

care/facility/api/viewsets/asset.py

@@ -58,6 +58,7 @@
     AvailabilityRecord,
     StatusChoices,
 )
+from care.facility.models.bed import AssetBed, ConsultationBed
 from care.users.models import User
 from care.utils.assetintegration.asset_classes import AssetClasses
 from care.utils.cache.cache_allowed_facilities import get_accessible_facilities
@@ -82,6 +83,22 @@ def delete_asset_cache(sender, instance, created, **kwargs):
     cache.delete("asset:qr:" + str(instance.qr_code_id))
     cache.delete("asset:qr:" + str(instance.id))
 
+class AssetLocationFilter(filters.FilterSet):
+    bed_is_occupied = filters.BooleanFilter(method="filter_bed_is_occupied")
+
+    def filter_bed_is_occupied(self, queryset, name, value):
+        asset_locations = AssetBed.objects.select_related("asset","bed").filter(asset__asset_class="HL7MONITOR").values_list("bed__location_id", "bed__id")
+        if value:
+            asset_locations = asset_locations.filter(
+                bed__id__in=Subquery(
+                    ConsultationBed.objects.filter(
+                        bed__id=OuterRef("bed__id"), end_date__isnull=value
+                    ).values("bed__id")
+                )
+            )
+        asset_locations = asset_locations.values_list("bed__location_id", flat=True)
+        return queryset.filter(id__in=asset_locations)
+
 
 class AssetLocationViewSet(
     ListModelMixin,
@@ -100,8 +117,9 @@ class AssetLocationViewSet(
     )
     serializer_class = AssetLocationSerializer
     lookup_field = "external_id"
-    filter_backends = (drf_filters.SearchFilter,)
+    filter_backends = (filters.DjangoFilterBackend, drf_filters.SearchFilter)
     search_fields = ["name"]
+    filterset_class = AssetLocationFilter
 
     def get_serializer_context(self):
         facility = self.get_facility()