Disable the Bed List of Already occupied Beds (back-end change) (#2116)

* backend changes

* adding suggested changes

* adding suggested change

* add suggested changes

* add tets

* Update care/facility/tests/test_bed_api.py

Co-authored-by: Rithvik Nishad <rithvikn2001@gmail.com>

* fix lint

---------

Co-authored-by: Aakash Singh <mail@singhaakash.dev>
Co-authored-by: Rithvik Nishad <rithvikn2001@gmail.com>
Co-authored-by: rithviknishad <mail@rithviknishad.dev>
Co-authored-by: Vignesh Hari <vichuhari100@gmail.com>

care/facility/api/viewsets/bed.py

@@ -38,6 +38,21 @@ class BedFilter(filters.FilterSet):
     facility = filters.UUIDFilter(field_name="facility__external_id")
     location = filters.UUIDFilter(field_name="location__external_id")
     bed_type = CareChoiceFilter(choice_dict=inverse_bed_type)
+    not_occupied_by_asset_type = filters.CharFilter(
+        method="filter_bed_is_not_occupied_by_asset_type"
+    )
+
+    def filter_bed_is_not_occupied_by_asset_type(self, queryset, name, value):
+        if value:
+            return queryset.filter(
+                ~Exists(
+                    AssetBed.objects.filter(
+                        bed__id=OuterRef("id"),
+                        asset__asset_class=value,
+                    )
+                )
+            )
+        return queryset
 
 
 class BedViewSet(

care/facility/tests/test_bed_api.py

@@ -2,6 +2,8 @@
 from rest_framework.test import APITestCase
 
 from care.facility.models import Bed
+from care.facility.models.bed import AssetBed
+from care.utils.assetintegration.asset_classes import AssetClasses
 from care.utils.tests.test_utils import TestUtils
 
 
@@ -36,3 +38,29 @@ def test_list_beds(self):
         with self.assertNumQueries(5):
             response = self.client.get("/api/v1/bed/")
         self.assertEqual(response.status_code, status.HTTP_200_OK)
+
+    def test_list_non_occupied_beds(self):
+        linked_bed = Bed.objects.create(
+            name="linked_bed",
+            location=self.asset_location,
+            facility=self.facility,
+        )
+        asset = self.create_asset(
+            self.asset_location, asset_class=AssetClasses.HL7MONITOR.name
+        )
+        AssetBed.objects.create(bed=linked_bed, asset=asset)
+
+        # 4 beds 1 linked with HL7MONITOR and 3 created in setup
+
+        response = self.client.get("/api/v1/bed/")
+
+        # Assert list returns 4 beds
+        self.assertEqual(response.json()["count"], 4)
+
+        response_with_not_occupied_bed = self.client.get(
+            "/api/v1/bed/",
+            {"not_occupied_by_asset_type": "HL7MONITOR"},
+        )
+
+        # Assert count of unoccupied beds is 3
+        self.assertEqual(response_with_not_occupied_bed.json()["count"], 3)