Coverage for docs_src / tutorial / relationship_attributes / cascade_delete_relationships / tutorial005_py310.py: 100%

1from sqlmodel import Field, Relationship, Session, SQLModel, create_engine, select, text 9 ctx1jklmnopqr

2 

3 

4class Team(SQLModel, table=True): 9 ctx1jklmnopqr

5 id: int | None = Field(default=None, primary_key=True) 9 ctx1jklmnopqr

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

7 headquarters: str 9 ctx1jklmnopqr

8 

9 heroes: list["Hero"] = Relationship(back_populates="team", passive_deletes="all") 9 ctx1jklmnopqr

10 

11 

12class Hero(SQLModel, table=True): 9 ctx1jklmnopqr

13 id: int | None = Field(default=None, primary_key=True) 9 ctx1jklmnopqr

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

15 secret_name: str 9 ctx1jklmnopqr

16 age: int | None = Field(default=None, index=True) 9 ctx1jklmnopqr

17 

18 team_id: int | None = Field( 9 ctx1jklmnopqr

19 default=None, foreign_key="team.id", ondelete="RESTRICT" 

20 ) 

21 team: Team | None = Relationship(back_populates="heroes") 9 ctx1jklmnopqr

22 

23 

24sqlite_file_name = "database.db" 9 ctx1jklmnopqr

25sqlite_url = f"sqlite:///{sqlite_file_name}" 9 ctx1jklmnopqr

26 

27engine = create_engine(sqlite_url, echo=True) 9 ctx1jklmnopqr

28 

29 

30def create_db_and_tables(): 9 ctx1jklmnopqr

31 SQLModel.metadata.create_all(engine) 9 ctx1gahibcdef

32 if engine.dialect.name == "sqlite": 9 ctx1gahibcdef

33 with engine.connect() as connection: 6 ctx1abcdef

34 connection.execute(text("PRAGMA foreign_keys=ON")) 6 ctx1abcdef

35 

36 

37def create_heroes(): 9 ctx1jklmnopqr

38 with Session(engine) as session: 9 ctx1gahibcdef

39 team_preventers = Team(name="Preventers", headquarters="Sharp Tower") 9 ctx1gahibcdef

40 team_z_force = Team(name="Z-Force", headquarters="Sister Margaret's Bar") 9 ctx1gahibcdef

41 

42 hero_deadpond = Hero( 9 ctx1gahibcdef

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

44 ) 

45 hero_rusty_man = Hero( 9 ctx1gahibcdef

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

47 ) 

48 hero_spider_boy = Hero(name="Spider-Boy", secret_name="Pedro Parqueador") 9 ctx1gahibcdef

49 session.add(hero_deadpond) 9 ctx1gahibcdef

50 session.add(hero_rusty_man) 9 ctx1gahibcdef

51 session.add(hero_spider_boy) 9 ctx1gahibcdef

52 session.commit() 9 ctx1gahibcdef

53 

54 session.refresh(hero_deadpond) 9 ctx1gahibcdef

55 session.refresh(hero_rusty_man) 9 ctx1gahibcdef

56 session.refresh(hero_spider_boy) 9 ctx1gahibcdef

57 

58 print("Created hero:", hero_deadpond) 9 ctx1gahibcdef

59 print("Created hero:", hero_rusty_man) 9 ctx1gahibcdef

60 print("Created hero:", hero_spider_boy) 9 ctx1gahibcdef

61 

62 hero_spider_boy.team = team_preventers 9 ctx1gahibcdef

63 session.add(hero_spider_boy) 9 ctx1gahibcdef

64 session.commit() 9 ctx1gahibcdef

65 session.refresh(hero_spider_boy) 9 ctx1gahibcdef

66 print("Updated hero:", hero_spider_boy) 9 ctx1gahibcdef

67 

68 hero_black_lion = Hero(name="Black Lion", secret_name="Trevor Challa", age=35) 9 ctx1gahibcdef

69 hero_sure_e = Hero(name="Princess Sure-E", secret_name="Sure-E") 9 ctx1gahibcdef

70 team_wakaland = Team( 9 ctx1gahibcdef

71 name="Wakaland", 

72 headquarters="Wakaland Capital City", 

73 heroes=[hero_black_lion, hero_sure_e], 

74 ) 

75 session.add(team_wakaland) 9 ctx1gahibcdef

76 session.commit() 9 ctx1gahibcdef

77 session.refresh(team_wakaland) 9 ctx1gahibcdef

78 print("Team Wakaland:", team_wakaland) 9 ctx1gahibcdef

79 

80 

81def remove_team_heroes(): 9 ctx1jklmnopqr

82 with Session(engine) as session: 9 ctx1gahibcdef

83 statement = select(Team).where(Team.name == "Wakaland") 9 ctx1gahibcdef

84 team = session.exec(statement).one() 9 ctx1gahibcdef

85 team.heroes.clear() 9 ctx1gahibcdef

86 session.add(team) 9 ctx1gahibcdef

87 session.commit() 9 ctx1gahibcdef

88 session.refresh(team) 9 ctx1gahibcdef

89 print("Team with removed heroes:", team) 9 ctx1gahibcdef

90 

91 

92def delete_team(): 9 ctx1jklmnopqr

93 with Session(engine) as session: 9 ctx1gahibcdef

94 statement = select(Team).where(Team.name == "Wakaland") 9 ctx1gahibcdef

95 team = session.exec(statement).one() 9 ctx1gahibcdef

96 session.delete(team) 9 ctx1gahibcdef

97 session.commit() 9 ctx1gahibcdef

98 print("Deleted team:", team) 9 ctx1gahibcdef

99 

100 

101def select_deleted_heroes(): 9 ctx1jklmnopqr

102 with Session(engine) as session: 9 ctx1gahibcdef

103 statement = select(Hero).where(Hero.name == "Black Lion") 9 ctx1gahibcdef

104 result = session.exec(statement) 9 ctx1gahibcdef

105 hero = result.first() 9 ctx1gahibcdef

106 print("Black Lion has no team:", hero) 9 ctx1gahibcdef

107 

108 statement = select(Hero).where(Hero.name == "Princess Sure-E") 9 ctx1gahibcdef

109 result = session.exec(statement) 9 ctx1gahibcdef

110 hero = result.first() 9 ctx1gahibcdef

111 print("Princess Sure-E has no team:", hero) 9 ctx1gahibcdef

112 

113 

114def main(): 9 ctx1jklmnopqr

115 create_db_and_tables() 9 ctx1gahibcdef

116 create_heroes() 9 ctx1gahibcdef

117 remove_team_heroes() 9 ctx1gahibcdef

118 delete_team() 9 ctx1gahibcdef

119 select_deleted_heroes() 9 ctx1gahibcdef

120 

121 

122if __name__ == "__main__": 9 ctx1jklmnopqr

123 main()