fix feed initial balance and report button

backend/apps/farms/tests.py

@@ -5,6 +5,7 @@ from rest_framework.test import APIClient
 
 from apps.accounts.models import User
 from apps.farms.models import Cycle, Flock, Kandang, Site
+from apps.operations.models import FeedSacks, ManualInput
 
 
 class FarmAPITests(TestCase):
@@ -85,3 +86,60 @@ class FarmAPITests(TestCase):
         self.assertEqual(response.status_code, 200, response.data)
         results = response.data["results"] if isinstance(response.data, dict) else response.data
         self.assertEqual(len(results), 2)
+
+    def test_set_initial_balance_seeds_feed_sack_snapshot_when_none_exist(self):
+        start = date.today()
+        cycle = Cycle.objects.create(
+            kandang=self.kandang,
+            total_days=35,
+            start_date=start,
+            end_date=start + timedelta(days=34),
+            doc_in_weight=40,
+            doc_in_count=9000,
+            status=Cycle.STATUS_ACTIVE,
+        )
+
+        self.client.force_authenticate(self.user)
+        response = self.client.post(
+            f"/api/v1/cycles/{cycle.pk}/initial-balance/",
+            {"date": start.isoformat(), "feed_in_manual": 120},
+            format="json",
+        )
+        self.assertEqual(response.status_code, 200, response.data)
+
+        row = FeedSacks.objects.get(cycle=cycle)
+        self.assertEqual(row.date, start)
+        self.assertEqual(row.in_total, 120)
+
+    def test_set_initial_balance_recomputes_existing_feed_sack_in_total(self):
+        start = date.today()
+        cycle = Cycle.objects.create(
+            kandang=self.kandang,
+            total_days=35,
+            start_date=start,
+            end_date=start + timedelta(days=34),
+            doc_in_weight=40,
+            doc_in_count=9000,
+            status=Cycle.STATUS_ACTIVE,
+        )
+        feed_row = FeedSacks.objects.create(
+            cycle=cycle,
+            date=start + timedelta(days=1),
+            in_today=4,
+            in_total=4,
+            out_today=0,
+            out_total=0,
+            feed_use_today=0,
+            feed_use_total=0,
+        )
+
+        self.client.force_authenticate(self.user)
+        response = self.client.post(
+            f"/api/v1/cycles/{cycle.pk}/initial-balance/",
+            {"date": start.isoformat(), "feed_in_manual": 120},
+            format="json",
+        )
+        self.assertEqual(response.status_code, 200, response.data)
+
+        feed_row.refresh_from_db()
+        self.assertEqual(feed_row.in_total, 124)