Feat: add response error when tribe already exists

backend/api/main.py

@@ -1,13 +1,17 @@
 import sqlite3
 
 from fastapi import FastAPI, status
+from fastapi.responses import JSONResponse
 
 from backend.adapters.sqlite import create_db
 from backend.api.model import StudentModel, TribeModel
 from backend.model.student import Student
 from backend.model.tribe import Tribe
 from backend.repository.student_sqlite_repository import StudentSQLiteRepository
-from backend.repository.tribe_sqlite_repository import TribeSQLiteRepository
+from backend.repository.tribe_sqlite_repository import (
+    TribeRepositoryError,
+    TribeSQLiteRepository,
+)
 
 # from sqlalchemy import create_engine
 # from sqlalchemy.orm import clear_mappers, sessionmaker
@@ -33,7 +37,13 @@ app = FastAPI()
 async def post_tribe(item: TribeModel):
     tribe = Tribe(**item.dict())
 
-    tribe_repo.add(tribe)
+    try:
+        tribe_repo.add(tribe)
+    except TribeRepositoryError:
+        return JSONResponse(
+            status_code=status.HTTP_409_CONFLICT,
+            content=f"The tribe {tribe.name} already exists",
+        )
     conn.commit()
 
     return tribe.to_dict()

backend/repository/tribe_sqlite_repository.py

@@ -2,11 +2,21 @@ from backend.model.tribe import Tribe
 from backend.repository.abstract_repository import AbstractRepository
 
 
+class TribeRepositoryError(Exception):
+    pass
+
+
 class TribeSQLiteRepository(AbstractRepository):
     def __init__(self, conn) -> None:
         self.conn = conn
 
     def add(self, tribe: Tribe) -> None:
+        tribes = self.list()
+        if tribe.name in map(lambda x: x.name, tribes):
+            raise TribeRepositoryError(
+                f"The tribe {tribe.name} already exists. Can't add it"
+            )
+
         self.conn.execute(
             """
         INSERT INTO tribes(name, level) VALUES (?, ?)