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✨ Add support for cascade delete relationships: `cascade_delete`, `on… · PaleNeutron/sqlmodel@86ab09f · GitHub

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✨ Add support for cascade delete relationships: cascade_delete, ondelete, and passive_deletes (fastapi#983)
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
1 parent 19c7367 commit 86ab09f

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‎docs/tutorial/relationship-attributes/cascade-delete-relationships.md‎

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‎docs_src/tutorial/relationship_attributes/cascade_delete_relationships/__init__.py‎

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‎docs_src/tutorial/relationship_attributes/cascade_delete_relationships/tutorial001.py‎

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from typing import List, Optional
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from sqlmodel import Field, Relationship, Session, SQLModel, create_engine, select
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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="team", cascade_delete=True)
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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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team_id: Optional[int] = Field(
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default=None, foreign_key="team.id", ondelete="CASCADE"
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)
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team: Optional[Team] = Relationship(back_populates="heroes")
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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", secret_name="Dive Wilson", team=team_z_force
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)
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hero_rusty_man = Hero(
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name="Rusty-Man", secret_name="Tommy Sharp", age=48, team=team_preventers
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)
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hero_spider_boy = Hero(name="Spider-Boy", secret_name="Pedro Parqueador")
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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("Created hero:", hero_deadpond)
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print("Created hero:", hero_rusty_man)
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print("Created hero:", hero_spider_boy)
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hero_spider_boy.team = team_preventers
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session.add(hero_spider_boy)
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session.commit()
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session.refresh(hero_spider_boy)
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print("Updated hero:", hero_spider_boy)
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hero_black_lion = Hero(name="Black Lion", secret_name="Trevor Challa", age=35)
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hero_sure_e = Hero(name="Princess Sure-E", secret_name="Sure-E")
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team_wakaland = Team(
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name="Wakaland",
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headquarters="Wakaland Capital City",
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heroes=[hero_black_lion, hero_sure_e],
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)
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session.add(team_wakaland)
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session.commit()
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session.refresh(team_wakaland)
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print("Team Wakaland:", team_wakaland)
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def delete_team():
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with Session(engine) as session:
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statement = select(Team).where(Team.name == "Wakaland")
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team = session.exec(statement).one()
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session.delete(team)
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session.commit()
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print("Deleted team:", team)
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def select_deleted_heroes():
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with Session(engine) as session:
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statement = select(Hero).where(Hero.name == "Black Lion")
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result = session.exec(statement)
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hero = result.first()
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print("Black Lion not found:", hero)
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statement = select(Hero).where(Hero.name == "Princess Sure-E")
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result = session.exec(statement)
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hero = result.first()
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print("Princess Sure-E not found:", hero)
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def main():
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create_db_and_tables()
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create_heroes()
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delete_team()
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select_deleted_heroes()
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if __name__ == "__main__":
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main()

‎docs_src/tutorial/relationship_attributes/cascade_delete_relationships/tutorial001_py310.py‎

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from sqlmodel import Field, Relationship, Session, SQLModel, create_engine, select
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class Team(SQLModel, table=True):
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id: int | None = 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="team", cascade_delete=True)
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class Hero(SQLModel, table=True):
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id: int | None = 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: int | None = Field(default=None, index=True)
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team_id: int | None = Field(default=None, foreign_key="team.id", ondelete="CASCADE")
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team: Team | None = Relationship(back_populates="heroes")
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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", secret_name="Dive Wilson", team=team_z_force
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)
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hero_rusty_man = Hero(
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name="Rusty-Man", secret_name="Tommy Sharp", age=48, team=team_preventers
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)
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hero_spider_boy = Hero(name="Spider-Boy", secret_name="Pedro Parqueador")
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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("Created hero:", hero_deadpond)
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print("Created hero:", hero_rusty_man)
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print("Created hero:", hero_spider_boy)
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hero_spider_boy.team = team_preventers
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session.add(hero_spider_boy)
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session.commit()
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session.refresh(hero_spider_boy)
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print("Updated hero:", hero_spider_boy)
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hero_black_lion = Hero(name="Black Lion", secret_name="Trevor Challa", age=35)
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hero_sure_e = Hero(name="Princess Sure-E", secret_name="Sure-E")
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team_wakaland = Team(
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name="Wakaland",
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headquarters="Wakaland Capital City",
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heroes=[hero_black_lion, hero_sure_e],
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)
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session.add(team_wakaland)
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session.commit()
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session.refresh(team_wakaland)
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print("Team Wakaland:", team_wakaland)
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def delete_team():
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with Session(engine) as session:
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statement = select(Team).where(Team.name == "Wakaland")
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team = session.exec(statement).one()
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session.delete(team)
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session.commit()
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print("Deleted team:", team)
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def select_deleted_heroes():
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with Session(engine) as session:
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statement = select(Hero).where(Hero.name == "Black Lion")
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result = session.exec(statement)
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hero = result.first()
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print("Black Lion not found:", hero)
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statement = select(Hero).where(Hero.name == "Princess Sure-E")
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result = session.exec(statement)
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hero = result.first()
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print("Princess Sure-E not found:", hero)
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def main():
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create_db_and_tables()
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create_heroes()
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delete_team()
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select_deleted_heroes()
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if __name__ == "__main__":
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main()

‎docs_src/tutorial/relationship_attributes/cascade_delete_relationships/tutorial001_py39.py‎

Lines changed: 110 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,110 @@
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from typing import Optional
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3+
from sqlmodel import Field, Relationship, Session, SQLModel, create_engine, select
4+
5+
6+
class Team(SQLModel, table=True):
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id: Optional[int] = Field(default=None, primary_key=True)
8+
name: str = Field(index=True)
9+
headquarters: str
10+
11+
heroes: list["Hero"] = Relationship(back_populates="team", cascade_delete=True)
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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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team_id: Optional[int] = Field(
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default=None, foreign_key="team.id", ondelete="CASCADE"
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)
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team: Optional[Team] = Relationship(back_populates="heroes")
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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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35+
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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")
40+
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hero_deadpond = Hero(
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name="Deadpond", secret_name="Dive Wilson", team=team_z_force
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)
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hero_rusty_man = Hero(
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name="Rusty-Man", secret_name="Tommy Sharp", age=48, team=team_preventers
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)
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hero_spider_boy = Hero(name="Spider-Boy", secret_name="Pedro Parqueador")
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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("Created hero:", hero_deadpond)
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print("Created hero:", hero_rusty_man)
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print("Created hero:", hero_spider_boy)
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hero_spider_boy.team = team_preventers
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session.add(hero_spider_boy)
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session.commit()
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session.refresh(hero_spider_boy)
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print("Updated hero:", hero_spider_boy)
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hero_black_lion = Hero(name="Black Lion", secret_name="Trevor Challa", age=35)
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hero_sure_e = Hero(name="Princess Sure-E", secret_name="Sure-E")
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team_wakaland = Team(
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name="Wakaland",
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headquarters="Wakaland Capital City",
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heroes=[hero_black_lion, hero_sure_e],
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)
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session.add(team_wakaland)
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session.commit()
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session.refresh(team_wakaland)
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print("Team Wakaland:", team_wakaland)
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def delete_team():
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with Session(engine) as session:
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statement = select(Team).where(Team.name == "Wakaland")
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team = session.exec(statement).one()
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session.delete(team)
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session.commit()
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print("Deleted team:", team)
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def select_deleted_heroes():
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with Session(engine) as session:
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statement = select(Hero).where(Hero.name == "Black Lion")
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result = session.exec(statement)
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hero = result.first()
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print("Black Lion not found:", hero)
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statement = select(Hero).where(Hero.name == "Princess Sure-E")
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result = session.exec(statement)
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hero = result.first()
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print("Princess Sure-E not found:", hero)
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def main():
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create_db_and_tables()
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create_heroes()
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delete_team()
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select_deleted_heroes()
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if __name__ == "__main__":
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main()

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