from typing import List, Optional from sqlmodel import Field, Relationship, Session, SQLModel, create_engine class HeroTeamLink(SQLModel, table=True): team_id: Optional[int] = Field( default=None, foreign_key="team.id", primary_key=True ) hero_id: Optional[int] = Field( default=None, foreign_key="hero.id", primary_key=True ) class Team(SQLModel, table=True): id: Optional[int] = Field(default=None, primary_key=True) name: str headquarters: str heroes: List["Hero"] = Relationship(back_populates="teams", link_model=HeroTeamLink) class Hero(SQLModel, table=True): id: Optional[int] = Field(default=None, primary_key=True) name: str secret_name: str age: Optional[int] = None teams: List[Team] = Relationship(back_populates="heroes", link_model=HeroTeamLink) sqlite_file_name = "database.db" sqlite_url = f"sqlite:///{sqlite_file_name}" engine = create_engine(sqlite_url, echo=True) def create_db_and_tables(): SQLModel.metadata.create_all(engine) def create_heroes(): with Session(engine) as session: team_preventers = Team(name="Preventers", headquarters="Sharp Tower") team_z_force = Team(name="Z-Force", headquarters="Sister Margaret’s Bar") hero_deadpond = Hero( name="Deadpond", secret_name="Dive Wilson", teams=[team_z_force, team_preventers], ) hero_rusty_man = Hero( name="Rusty-Man", secret_name="Tommy Sharp", age=48, teams=[team_preventers], ) hero_spider_boy = Hero( name="Spider-Boy", secret_name="Pedro Parqueador", teams=[team_preventers] ) session.add(hero_deadpond) session.add(hero_rusty_man) session.add(hero_spider_boy) session.commit() session.refresh(hero_deadpond) session.refresh(hero_rusty_man) session.refresh(hero_spider_boy) print("Deadpond:", hero_deadpond) print("Deadpond teams:", hero_deadpond.teams) print("Rusty-Man:", hero_rusty_man) print("Rusty-Man Teams:", hero_rusty_man.teams) print("Spider-Boy:", hero_spider_boy) print("Spider-Boy Teams:", hero_spider_boy.teams) def main(): create_db_and_tables() create_heroes() if __name__ == "__main__": main()