[GREEN] Implement age filter with status on export case data

apps/exportables/views.py

 from django.http import JsonResponse
 from django.db.models import Max
-from rest_framework import status
+from rest_framework import status, serializers
 from rest_framework.response import Response
 from rest_framework.views import APIView
 
@@ -95,13 +95,30 @@ class ExportInvestigationCaseView(APIView):
     def get(self, request, format=None):
         cases = InvestigationCase.objects.all()
         query_is_male = self.request.query_params.get('is_male', None)
-        query_age = self.request.query_params.get('age', None)
+        query_min_age = self.request.query_params.get('min_age', None)
+        query_max_age = self.request.query_params.get('max_age', None)
         query_district = self.request.query_params.get('district', None)
 
         if query_is_male is not None:
-            cases = cases.filter(case_subject__is_male=(query_is_male.lower() == 'true'))
-        if query_age is not None:
-            cases = cases.filter(case_subject__age=int(query_age))
+            query_is_male = query_is_male.lower()
+            if query_is_male not in ['true', 'false']:
+                raise serializers.ValidationError(
+                    'is_male query param must be either "true" or "false"')
+            cases = cases.filter(case_subject__is_male=(query_is_male == 'true'))
+
+        if (query_min_age is not None) and (query_max_age is not None):
+            try:
+                query_min_age = int(query_min_age)
+            except ValueError:
+                raise serializers.ValidationError('min_age query param must be an integer')
+
+            try:
+                query_max_age = int(query_max_age)
+            except ValueError:
+                raise serializers.ValidationError('min_age query param must be an integer')
+
+            cases = cases.filter(case_subject__age__range=(query_min_age, query_max_age))
+
         if query_district is not None:
             cases = cases.filter(case_subject__district=query_district)