Coverage for docs_src / tutorial / relationship_attributes / cascade_delete_relationships / tutorial002_py39.py: 100%

1from typing import Optional 9 ctx1jklmnopqr

2 

3from sqlmodel import Field, Relationship, Session, SQLModel, create_engine, select 9 ctx1jklmnopqr

4 

5 

6class Team(SQLModel, table=True): 9 ctx1jklmnopqr

7 id: Optional[int] = Field(default=None, primary_key=True) 9 ctx1jklmnopqr

8 name: str = Field(index=True) 9 ctx1jklmnopqr

9 headquarters: str 9 ctx1jklmnopqr

10 

11 heroes: list["Hero"] = Relationship(back_populates="team") 9 ctx1jklmnopqr

12 

13 

14class Hero(SQLModel, table=True): 9 ctx1jklmnopqr

15 id: Optional[int] = Field(default=None, primary_key=True) 9 ctx1jklmnopqr

16 name: str = Field(index=True) 9 ctx1jklmnopqr

17 secret_name: str 9 ctx1jklmnopqr

18 age: Optional[int] = Field(default=None, index=True) 9 ctx1jklmnopqr

19 

20 team_id: Optional[int] = Field( 9 ctx1jklmnopqr

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

22 ) 

23 team: Optional[Team] = Relationship(back_populates="heroes") 9 ctx1jklmnopqr

24 

25 

26sqlite_file_name = "database.db" 9 ctx1jklmnopqr

27sqlite_url = f"sqlite:///{sqlite_file_name}" 9 ctx1jklmnopqr

28 

29engine = create_engine(sqlite_url, echo=True) 9 ctx1jklmnopqr

30 

31 

32def create_db_and_tables(): 9 ctx1jklmnopqr

33 SQLModel.metadata.create_all(engine) 9 ctx1abcdefghi

34 

35 

36def create_heroes(): 9 ctx1jklmnopqr

37 with Session(engine) as session: 9 ctx1abcdefghi

38 team_preventers = Team(name="Preventers", headquarters="Sharp Tower") 9 ctx1abcdefghi

39 team_z_force = Team(name="Z-Force", headquarters="Sister Margaret's Bar") 9 ctx1abcdefghi

40 

41 hero_deadpond = Hero( 9 ctx1abcdefghi

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

43 ) 

44 hero_rusty_man = Hero( 9 ctx1abcdefghi

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") 9 ctx1abcdefghi

48 session.add(hero_deadpond) 9 ctx1abcdefghi

49 session.add(hero_rusty_man) 9 ctx1abcdefghi

50 session.add(hero_spider_boy) 9 ctx1abcdefghi

51 session.commit() 9 ctx1abcdefghi

52 

53 session.refresh(hero_deadpond) 9 ctx1abcdefghi

54 session.refresh(hero_rusty_man) 9 ctx1abcdefghi

55 session.refresh(hero_spider_boy) 9 ctx1abcdefghi

56 

57 print("Created hero:", hero_deadpond) 9 ctx1abcdefghi

58 print("Created hero:", hero_rusty_man) 9 ctx1abcdefghi

59 print("Created hero:", hero_spider_boy) 9 ctx1abcdefghi

60 

61 hero_spider_boy.team = team_preventers 9 ctx1abcdefghi

62 session.add(hero_spider_boy) 9 ctx1abcdefghi

63 session.commit() 9 ctx1abcdefghi

64 session.refresh(hero_spider_boy) 9 ctx1abcdefghi

65 print("Updated hero:", hero_spider_boy) 9 ctx1abcdefghi

66 

67 hero_black_lion = Hero(name="Black Lion", secret_name="Trevor Challa", age=35) 9 ctx1abcdefghi

68 hero_sure_e = Hero(name="Princess Sure-E", secret_name="Sure-E") 9 ctx1abcdefghi

69 team_wakaland = Team( 9 ctx1abcdefghi

70 name="Wakaland", 

71 headquarters="Wakaland Capital City", 

72 heroes=[hero_black_lion, hero_sure_e], 

73 ) 

74 session.add(team_wakaland) 9 ctx1abcdefghi

75 session.commit() 9 ctx1abcdefghi

76 session.refresh(team_wakaland) 9 ctx1abcdefghi

77 print("Team Wakaland:", team_wakaland) 9 ctx1abcdefghi

78 

79 

80def delete_team(): 9 ctx1jklmnopqr

81 with Session(engine) as session: 9 ctx1abcdefghi

82 statement = select(Team).where(Team.name == "Wakaland") 9 ctx1abcdefghi

83 team = session.exec(statement).one() 9 ctx1abcdefghi

84 session.delete(team) 9 ctx1abcdefghi

85 session.commit() 9 ctx1abcdefghi

86 print("Deleted team:", team) 9 ctx1abcdefghi

87 

88 

89def select_deleted_heroes(): 9 ctx1jklmnopqr

90 with Session(engine) as session: 9 ctx1abcdefghi

91 statement = select(Hero).where(Hero.name == "Black Lion") 9 ctx1abcdefghi

92 result = session.exec(statement) 9 ctx1abcdefghi

93 hero = result.first() 9 ctx1abcdefghi

94 print("Black Lion has no team:", hero) 9 ctx1abcdefghi

95 

96 statement = select(Hero).where(Hero.name == "Princess Sure-E") 9 ctx1abcdefghi

97 result = session.exec(statement) 9 ctx1abcdefghi

98 hero = result.first() 9 ctx1abcdefghi

99 print("Princess Sure-E has no team:", hero) 9 ctx1abcdefghi

100 

101 

102def main(): 9 ctx1jklmnopqr

103 create_db_and_tables() 9 ctx1abcdefghi

104 create_heroes() 9 ctx1abcdefghi

105 delete_team() 9 ctx1abcdefghi

106 select_deleted_heroes() 9 ctx1abcdefghi

107 

108 

109if __name__ == "__main__": 9 ctx1jklmnopqr

110 main()