codex/fix: purchase receivement error and recording doesn't show depletion/egg

internal/modules/purchases/repositories/purchase.repository.go

@@ -143,6 +143,17 @@ func (r *PurchaseRepositoryImpl) CreateItems(ctx context.Context, purchaseID uin
 	return r.DB().WithContext(ctx).Create(&items).Error
 }
 
+func (r *PurchaseRepositoryImpl) purchaseItemExists(ctx context.Context, purchaseID uint, itemID uint) (bool, error) {
+	var count int64
+	if err := r.DB().WithContext(ctx).
+		Model(&entity.PurchaseItem{}).
+		Where("purchase_id = ? AND id = ?", purchaseID, itemID).
+		Count(&count).Error; err != nil {
+		return false, err
+	}
+	return count > 0, nil
+}
+
 type PurchasePricingUpdate struct {
 	ItemID     uint
 	ProductID  *uint
@@ -197,7 +208,13 @@ func (r *PurchaseRepositoryImpl) UpdatePricing(
 			return result.Error
 		}
 		if result.RowsAffected == 0 {
-			return gorm.ErrRecordNotFound
+			exists, err := r.purchaseItemExists(ctx, purchaseID, upd.ItemID)
+			if err != nil {
+				return err
+			}
+			if !exists {
+				return gorm.ErrRecordNotFound
+			}
 		}
 	}
 
@@ -251,7 +268,13 @@ func (r *PurchaseRepositoryImpl) UpdateReceivingDetails(
 			return result.Error
 		}
 		if result.RowsAffected == 0 {
-			return gorm.ErrRecordNotFound
+			exists, err := r.purchaseItemExists(ctx, purchaseID, upd.ItemID)
+			if err != nil {
+				return err
+			}
+			if !exists {
+				return gorm.ErrRecordNotFound
+			}
 		}
 	}