Rename error

backend/app.py

@@ -4,7 +4,7 @@
 from starlette.requests import Request
 from starlette.responses import JSONResponse
 
-from db.errors.database_errors import ActionAlreadyPerformedError, ItemNotFoundError
+from db.errors.database_errors import ActionAlreadyPerformedError, ItemNotFoundError, NoSuchRelationError
 from routes.errors.authentication import InvalidRoleCredentialsError, NoAccessToSubjectError
 from routes.group import group_router
 from routes.project import project_router
@@ -74,5 +74,13 @@ def action_already_performed_error_handler(request: Request, exc: ActionAlreadyP
     )
 
 
+@app.exception_handler(NoSuchRelationError)
+def no_such_relation_error_handler(request: Request, exc: NoSuchRelationError) -> JSONResponse:
+    return JSONResponse(
+        status_code=status.HTTP_400_BAD_REQUEST,
+        content={"detail": str(exc)},
+    )
+
+
 if __name__ == "__main__":
     uvicorn.run("app:app")

backend/db/errors/database_errors.py

@@ -1,9 +1,13 @@
 class ItemNotFoundError(Exception):
-
     def __init__(self, message: str) -> None:
         super().__init__(message)
 
 
 class ActionAlreadyPerformedError(Exception):
     def __init__(self, message: str) -> None:
         super().__init__(message)
+
+
+class NoSuchRelationError(Exception):
+    def __init__(self, message: str) -> None:
+        super().__init__(message)

backend/domain/logic/group.py

@@ -1,6 +1,6 @@
 from sqlalchemy.orm import Session
 
-from db.errors.database_errors import ActionAlreadyPerformedError
+from db.errors.database_errors import ActionAlreadyPerformedError, NoSuchRelationError
 from db.models.models import Group, Project, Student
 from domain.logic.basic_operations import get, get_all
 from domain.models.GroupDataclass import GroupDataclass
@@ -56,7 +56,7 @@ def remove_student_from_group(session: Session, student_id: int, group_id: int)
 
     if student not in group.students:
         msg = f"Student with id {student_id} is not in group with id {group_id}"
-        raise ActionAlreadyPerformedError(msg)
+        raise NoSuchRelationError(msg)
 
     group.students.remove(student)
     session.commit()