Pat/line graph

backend/donations/views.py

@@ -22,7 +22,7 @@ def total(self, request):
         return Response({"total_donated_amount": total_amount})
 
     # returns total donation amount for each charity
-    @action(detail=False, methods=["get"], url_path="total_by_charity")
+    @action(detail=False, methods=["get"], url_path="total-by-charity")
     def total_by_charity(self, request):
         # note the double underscore
         aggregated = (

backend/orders/urls.py

@@ -30,5 +30,10 @@
         "total-donations/",
         DonationViewSet.as_view({"get": "get_total_donations"}),
         name="total-donations",
+    ),    
+    path(
+        "monthly-donations/",
+        DonationViewSet.as_view({"get": "get_donations_by_month"}),
+        name="monthly-donations",
     ),
 ]

backend/orders/views.py

@@ -7,6 +7,7 @@
 from rest_framework.permissions import AllowAny
 
 from django_filters import FilterSet
+from django.db.models.functions import TruncMonth
 
 from .models import DonationOrder
 from .serializers import DonationOrderSerializer
@@ -52,3 +53,43 @@ def get_total_donations(self, request) -> float:
             or 0
         )
         return Response({"donation_total": total_donations}, status=200)
+
+    def get_donations_by_month(self, request):
+        """This method will return a list of donations per month
+
+        Example call: http://127.0.0.1:8000/monthly-donations/"""
+        queryset = self.get_queryset()
+
+        monthly_donations = (
+            queryset.annotate(month=TruncMonth("date"))
+            .values("month")
+            .annotate(total_amount=Sum("amount"))
+            .order_by("month")
+        )
+
+        if not monthly_donations:
+            return Response({})
+
+        donation_dict = {}
+        for entry in monthly_donations:
+            donation_dict[entry["month"].strftime("%b/%y")] = entry["total_amount"]
+
+        start_month = monthly_donations[0]["month"].replace(day=1)
+        end_month = monthly_donations[len(monthly_donations) - 1]["month"].replace(day=1)
+
+        # Generate all months between start and end
+        current = start_month
+        result = []
+
+        while current <= end_month:
+            key = current.strftime("%b/%y")
+            result.append({key: donation_dict.get(key, 0)}) 
+
+            next_month = current.month % 12 + 1
+            next_year = current.year + (current.month // 12)
+            current = current.replace(
+                year=next_year if next_month == 1 else current.year,
+                month=next_month
+            )
+
+        return Response({"monthly_donations": result}, status=200)