add get_parents_lists_by_school_id route

app/api/parents_list/models.py

@@ -1,8 +1,8 @@
 from typing import Optional
 
 from pydantic import field_validator
-from sqlalchemy import Column, ForeignKey, Integer
-from sqlmodel import Field
+from sqlalchemy import Column, ForeignKey, Integer, select
+from sqlmodel import Field, Session
 
 from app.commun.validator import validate_string
 from app.database.model_base import BaseSQLModel
@@ -30,5 +30,12 @@ def list_name_format(cls, value: str) -> str:
 class ParentsListService(Repository[ParentsList]):
     __model__ = ParentsList
 
+    def get_all_by_school_id(
+        self, session: Session, school_id: int
+    ) -> list[ParentsList]:
+        statement = select(ParentsList).where(ParentsList.school_id == school_id)
+
+        return [item[0] for item in session.exec(statement).all()]
+
 
 PARENTS_LIST_SERVICE = ParentsListService()