Asset location route: modifications for CNS (#2545)

* CNS location

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

* Added new test cases for asset locations

* using asset class instead of string

* fix formatting

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
@@ -84,6 +85,27 @@ def delete_asset_cache(sender, instance, created, **kwargs):
     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=AssetClasses.HL7MONITOR.name)
+            .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,
     RetrieveModelMixin,
@@ -101,8 +123,9 @@ 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()

care/facility/tests/test_asset_location_api.py

@@ -1,6 +1,7 @@
 from rest_framework import status
 from rest_framework.test import APITestCase
 
+from care.utils.assetintegration.asset_classes import AssetClasses
 from care.utils.tests.test_utils import TestUtils
 
 
@@ -15,22 +16,62 @@ def setUpTestData(cls) -> None:
         cls.asset_location = cls.create_asset_location(cls.facility)
         cls.asset_location_with_linked_bed = cls.create_asset_location(cls.facility)
         cls.asset_location_with_linked_asset = cls.create_asset_location(cls.facility)
-        cls.asset = cls.create_asset(cls.asset_location_with_linked_asset)
+        cls.asset = cls.create_asset(
+            cls.asset_location_with_linked_asset,
+            asset_class=AssetClasses.HL7MONITOR.name,
+        )
         cls.bed = cls.create_bed(cls.facility, cls.asset_location_with_linked_bed)
+        cls.asset_bed = cls.create_asset_bed(cls.asset, cls.bed)
         cls.patient = cls.create_patient(cls.district, cls.facility)
         cls.consultation = cls.create_consultation(cls.patient, cls.facility)
         cls.consultation_bed = cls.create_consultation_bed(cls.consultation, cls.bed)
         cls.user = cls.create_user("staff", cls.district, home_facility=cls.facility)
         cls.deleted_asset = cls.create_asset(cls.asset_location)
         cls.deleted_asset.deleted = True
         cls.deleted_asset.save()
+        cls.asset_second_location = cls.create_asset_location(
+            cls.facility, name="asset2 location"
+        )
+        cls.asset_second = cls.create_asset(
+            cls.asset_second_location, asset_class=AssetClasses.HL7MONITOR.name
+        )
+        cls.asset_bed_second = cls.create_bed(cls.facility, cls.asset_second_location)
+        cls.assetbed_second = cls.create_asset_bed(
+            cls.asset_second, cls.asset_bed_second
+        )
 
     def test_list_asset_locations(self):
         response = self.client.get(
             f"/api/v1/facility/{self.facility.external_id}/asset_location/"
         )
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertContains(response, self.asset_location.external_id)
+        self.assertContains(response, self.asset_second_location.external_id)
+
+    def test_asset_locations_get_monitors_all(self):
+        response = self.client.get(
+            f"/api/v1/facility/{self.facility.external_id}/asset_location/?bed_is_occupied=false"
+        )
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertContains(response, self.asset_location_with_linked_bed.external_id)
+        self.assertContains(response, self.asset_second_location.external_id)
+
+    def test_asset_locations_get_monitors_only_consultation_bed(self):
+        response = self.client.get(
+            f"/api/v1/facility/{self.facility.external_id}/asset_location/?bed_is_occupied=true"
+        )
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertContains(response, self.asset_location_with_linked_bed.external_id)
+
+    def test_asset_locations_get_only_monitors(self):
+        self.asset.asset_class = AssetClasses.VENTILATOR.name
+        self.asset.save()
+        response = self.client.get(
+            f"/api/v1/facility/{self.facility.external_id}/asset_location/?bed_is_occupied=false"
+        )
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertContains(response, self.asset_second_location.external_id)
+        self.assertEqual(len(response.data["results"]), 1)
 
     def test_retrieve_asset_location(self):
         response = self.client.get(