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