Coverage for docs_src / tutorial / relationship_attributes / cascade_delete_relationships / tutorial003_py310.py: 100%

1from sqlmodel import Field, Relationship, Session, SQLModel, create_engine, select, text 8 ctx1ijklmnop

2 

3 

4class Team(SQLModel, table=True): 8 ctx1ijklmnop

5 id: int | None = Field(default=None, primary_key=True) 8 ctx1ijklmnop

6 name: str = Field(index=True) 8 ctx1ijklmnop

7 headquarters: str 8 ctx1ijklmnop

8 

9 heroes: list["Hero"] = Relationship(back_populates="team", passive_deletes="all") 8 ctx1ijklmnop

10 

11 

12class Hero(SQLModel, table=True): 8 ctx1ijklmnop

13 id: int | None = Field(default=None, primary_key=True) 8 ctx1ijklmnop

14 name: str = Field(index=True) 8 ctx1ijklmnop

15 secret_name: str 8 ctx1ijklmnop

16 age: int | None = Field(default=None, index=True) 8 ctx1ijklmnop

17 

18 team_id: int | None = Field( 8 ctx1ijklmnop

19 default=None, foreign_key="team.id", ondelete="SET NULL" 

20 ) 

21 team: Team | None = Relationship(back_populates="heroes") 8 ctx1ijklmnop

22 

23 

24sqlite_file_name = "database.db" 8 ctx1ijklmnop

25sqlite_url = f"sqlite:///{sqlite_file_name}" 8 ctx1ijklmnop

26 

27engine = create_engine(sqlite_url, echo=True) 8 ctx1ijklmnop

28 

29 

30def create_db_and_tables(): 8 ctx1ijklmnop

31 SQLModel.metadata.create_all(engine) 8 ctx1abcdefgh

32 with engine.connect() as connection: 8 ctx1abcdefgh

33 connection.execute(text("PRAGMA foreign_keys=ON")) # for SQLite only 8 ctx1abcdefgh

34 

35 

36def create_heroes(): 8 ctx1ijklmnop

37 with Session(engine) as session: 8 ctx1abcdefgh

38 team_preventers = Team(name="Preventers", headquarters="Sharp Tower") 8 ctx1abcdefgh

39 team_z_force = Team(name="Z-Force", headquarters="Sister Margaret's Bar") 8 ctx1abcdefgh

40 

41 hero_deadpond = Hero( 8 ctx1abcdefgh

42 name="Deadpond", secret_name="Dive Wilson", team=team_z_force 

43 ) 

44 hero_rusty_man = Hero( 8 ctx1abcdefgh

45 name="Rusty-Man", secret_name="Tommy Sharp", age=48, team=team_preventers 

46 ) 

47 hero_spider_boy = Hero(name="Spider-Boy", secret_name="Pedro Parqueador") 8 ctx1abcdefgh

48 session.add(hero_deadpond) 8 ctx1abcdefgh

49 session.add(hero_rusty_man) 8 ctx1abcdefgh

50 session.add(hero_spider_boy) 8 ctx1abcdefgh

51 session.commit() 8 ctx1abcdefgh

52 

53 session.refresh(hero_deadpond) 8 ctx1abcdefgh

54 session.refresh(hero_rusty_man) 8 ctx1abcdefgh

55 session.refresh(hero_spider_boy) 8 ctx1abcdefgh

56 

57 print("Created hero:", hero_deadpond) 8 ctx1abcdefgh

58 print("Created hero:", hero_rusty_man) 8 ctx1abcdefgh

59 print("Created hero:", hero_spider_boy) 8 ctx1abcdefgh

60 

61 hero_spider_boy.team = team_preventers 8 ctx1abcdefgh

62 session.add(hero_spider_boy) 8 ctx1abcdefgh

63 session.commit() 8 ctx1abcdefgh

64 session.refresh(hero_spider_boy) 8 ctx1abcdefgh

65 print("Updated hero:", hero_spider_boy) 8 ctx1abcdefgh

66 

67 hero_black_lion = Hero(name="Black Lion", secret_name="Trevor Challa", age=35) 8 ctx1abcdefgh

68 hero_sure_e = Hero(name="Princess Sure-E", secret_name="Sure-E") 8 ctx1abcdefgh

69 team_wakaland = Team( 8 ctx1abcdefgh

70 name="Wakaland", 

71 headquarters="Wakaland Capital City", 

72 heroes=[hero_black_lion, hero_sure_e], 

73 ) 

74 session.add(team_wakaland) 8 ctx1abcdefgh

75 session.commit() 8 ctx1abcdefgh

76 session.refresh(team_wakaland) 8 ctx1abcdefgh

77 print("Team Wakaland:", team_wakaland) 8 ctx1abcdefgh

78 

79 

80def delete_team(): 8 ctx1ijklmnop

81 with Session(engine) as session: 8 ctx1abcdefgh

82 statement = select(Team).where(Team.name == "Wakaland") 8 ctx1abcdefgh

83 team = session.exec(statement).one() 8 ctx1abcdefgh

84 session.delete(team) 8 ctx1abcdefgh

85 session.commit() 8 ctx1abcdefgh

86 print("Deleted team:", team) 8 ctx1abcdefgh

87 

88 

89def select_deleted_heroes(): 8 ctx1ijklmnop

90 with Session(engine) as session: 8 ctx1abcdefgh

91 statement = select(Hero).where(Hero.name == "Black Lion") 8 ctx1abcdefgh

92 result = session.exec(statement) 8 ctx1abcdefgh

93 hero = result.first() 8 ctx1abcdefgh

94 print("Black Lion has no team:", hero) 8 ctx1abcdefgh

95 

96 statement = select(Hero).where(Hero.name == "Princess Sure-E") 8 ctx1abcdefgh

97 result = session.exec(statement) 8 ctx1abcdefgh

98 hero = result.first() 8 ctx1abcdefgh

99 print("Princess Sure-E has no team:", hero) 8 ctx1abcdefgh

100 

101 

102def main(): 8 ctx1ijklmnop

103 create_db_and_tables() 8 ctx1abcdefgh

104 create_heroes() 8 ctx1abcdefgh

105 delete_team() 8 ctx1abcdefgh

106 select_deleted_heroes() 8 ctx1abcdefgh

107 

108 

109if __name__ == "__main__": 8 ctx1ijklmnop

110 main()