Move rice transplant entries on variety change

backend/apps/plans/tests.py

@@ -1,12 +1,20 @@
 from django.contrib.auth import get_user_model
 from django.test import TestCase
 from rest_framework.test import APIRequestFactory, force_authenticate
+from decimal import Decimal
 
 from apps.fertilizer.models import FertilizationEntry, FertilizationPlan, Fertilizer
 from apps.fields.models import Field
 from apps.materials.models import Material, StockTransaction
 from apps.materials.stock_service import create_reserves_for_plan
-from .models import Crop, Plan, PlanVarietyChange, Variety
+from .models import (
+    Crop,
+    Plan,
+    PlanVarietyChange,
+    RiceTransplantEntry,
+    RiceTransplantPlan,
+    Variety,
+)
 from .serializers import PlanSerializer
 from .views import PlanViewSet
 
@@ -64,7 +72,7 @@ class PlanVarietyChangeTests(TestCase):
         self.assertEqual(change.year, 2026)
         self.assertEqual(change.old_variety_id, self.old_variety.id)
         self.assertEqual(change.new_variety_id, self.new_variety.id)
-        self.assertEqual(change.moved_entry_count, 0)
+        self.assertEqual(change.fertilizer_moved_entry_count, 0)
 
     def test_serializer_update_does_not_create_history_without_variety_change(self):
         serializer = PlanSerializer(
@@ -158,7 +166,7 @@ class PlanVarietyChangeTests(TestCase):
         serializer.save()
 
         change = PlanVarietyChange.objects.get(plan=self.plan)
-        self.assertEqual(change.moved_entry_count, 1)
+        self.assertEqual(change.fertilizer_moved_entry_count, 1)
 
         old_fertilization_plan.refresh_from_db()
         new_plan = FertilizationPlan.objects.exclude(id=old_fertilization_plan.id).get(
@@ -201,3 +209,50 @@ class PlanVarietyChangeTests(TestCase):
             },
         )
         self.assertEqual(new_reserves[0].quantity, unspread_entry.bags)
+
+    def test_serializer_update_moves_rice_transplant_entries_for_target_field(self):
+        old_rice_plan = RiceTransplantPlan.objects.create(
+            name='2026年度 にこまる 田植え計画',
+            year=2026,
+            variety=self.old_variety,
+            default_seed_grams_per_box='200.00',
+            seedling_boxes_per_tan='12.00',
+            notes='旧計画メモ',
+        )
+        target_entry = RiceTransplantEntry.objects.create(
+            plan=old_rice_plan,
+            field=self.field,
+            installed_seedling_boxes='14.40',
+            seed_grams_per_box='200.00',
+        )
+        other_entry = RiceTransplantEntry.objects.create(
+            plan=old_rice_plan,
+            field=self.other_field,
+            installed_seedling_boxes='9.60',
+            seed_grams_per_box='200.00',
+        )
+
+        serializer = PlanSerializer(
+            instance=self.plan,
+            data={'variety': self.new_variety.id},
+            partial=True,
+        )
+        self.assertTrue(serializer.is_valid(), serializer.errors)
+        serializer.save()
+
+        target_entry.refresh_from_db()
+        other_entry.refresh_from_db()
+
+        new_rice_plan = RiceTransplantPlan.objects.exclude(id=old_rice_plan.id).get(
+            year=2026,
+            variety=self.new_variety,
+        )
+        self.assertEqual(
+            new_rice_plan.name,
+            f'2026年度 {self.new_variety.name} 田植え計画（品種変更移動）',
+        )
+        self.assertEqual(new_rice_plan.default_seed_grams_per_box, Decimal('200.00'))
+        self.assertEqual(new_rice_plan.seedling_boxes_per_tan, Decimal('12.00'))
+        self.assertEqual(new_rice_plan.notes, old_rice_plan.notes)
+        self.assertEqual(target_entry.plan_id, new_rice_plan.id)
+        self.assertEqual(other_entry.plan_id, old_rice_plan.id)