fix merge conflict

src/template_project/application/notification_device/data_gateway.py

@@ -1,11 +1,19 @@
 from abc import abstractmethod
 from typing import Protocol
 
+from template_project.application.notification_device.entity import NotificationDevice
 from template_project.application.user.entity import UserId
-from template_project.application.user.notification_device.entity import NotificationDevice
 
 
 class NotificationDeviceDataGateway(Protocol):
     @abstractmethod
     async def load_by_user_id(self, user_id: UserId) -> NotificationDevice | None:
         raise NotImplementedError
+
+    @abstractmethod
+    async def load_by_user_id_and_device_id(
+        self,
+        user_id: UserId,
+        device_id: str,
+    ) -> NotificationDevice | None:
+        raise NotImplementedError

src/template_project/application/notification_device/interactors/register_device.py

@@ -0,0 +1,37 @@
+from template_project.application.common.data_structure import to_data_structure
+from template_project.application.common.identity_provider import IdentityProvider
+from template_project.application.common.interactor import to_interactor
+from template_project.application.common.unit_of_work import UnitOfWork
+from template_project.application.notification_device.data_gateway import NotificationDeviceDataGateway
+from template_project.application.notification_device.entity import NotificationDevice
+
+
+@to_data_structure
+class RegisterNotificationDeviceRequest:
+    device_id: str
+
+
+@to_interactor
+class RegisterNotificationDeviceInteractor:
+    identity_provider: IdentityProvider
+    notification_device_data_gateway: NotificationDeviceDataGateway
+    unit_of_work: UnitOfWork
+
+    async def execute(self, request: RegisterNotificationDeviceRequest) -> None:
+        current_user = await self.identity_provider.get_current_user()
+
+        existing_device = await self.notification_device_data_gateway.load_by_user_id_and_device_id(
+            user_id=current_user.id,
+            device_id=request.device_id,
+        )
+
+        if existing_device:
+            return
+
+        notification_device = NotificationDevice.factory(
+            user_id=current_user.id,
+            device_id=request.device_id,
+        )
+
+        await self.unit_of_work.add(notification_device)
+        await self.unit_of_work.commit()

src/template_project/application/notification_device/interactors/send_notification.py

@@ -2,8 +2,8 @@ from template_project.application.common.data_structure import to_data_structure
 from template_project.application.common.identity_provider import IdentityProvider
 from template_project.application.common.interactor import to_interactor
 from template_project.application.common.notifications.service import NotificationService
-from template_project.application.user.notification_device.data_gateway import NotificationDeviceDataGateway
-from template_project.application.user.notification_device.errors import NotificationDeviceNotFoundError
+from template_project.application.notification_device.data_gateway import NotificationDeviceDataGateway
+from template_project.application.notification_device.errors import NotificationDeviceNotFoundError
 
 
 @to_data_structure