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 4 ctx1abcd

2 

3 

4class Team(SQLModel, table=True): 4 ctx1abcd

5 id: int | None = Field(default=None, primary_key=True) 4 ctx1abcd

6 name: str = Field(index=True) 4 ctx1abcd

7 headquarters: str 4 ctx1abcd

8 

9 heroes: list["Hero"] = Relationship(back_populates="team", passive_deletes="all") 4 ctx1abcd

10 

11 

12class Hero(SQLModel, table=True): 4 ctx1abcd

13 id: int | None = Field(default=None, primary_key=True) 4 ctx1abcd

14 name: str = Field(index=True) 4 ctx1abcd

15 secret_name: str 4 ctx1abcd

16 age: int | None = Field(default=None, index=True) 4 ctx1abcd

17 

18 team_id: int | None = Field( 4 ctx1abcd

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

20 ) 

21 team: Team | None = Relationship(back_populates="heroes") 4 ctx1abcd

22 

23 

24sqlite_file_name = "database.db" 4 ctx1abcd

25sqlite_url = f"sqlite:///{sqlite_file_name}" 4 ctx1abcd

26 

27engine = create_engine(sqlite_url, echo=True) 4 ctx1abcd

28 

29 

30def create_db_and_tables(): 4 ctx1abcd

31 SQLModel.metadata.create_all(engine) 4 ctx1abcd

32 with engine.connect() as connection: 4 ctx1abcd

33 connection.execute(text("PRAGMA foreign_keys=ON")) # for SQLite only 4 ctx1abcd

34 

35 

36def create_heroes(): 4 ctx1abcd

37 with Session(engine) as session: 4 ctx1abcd

38 team_preventers = Team(name="Preventers", headquarters="Sharp Tower") 4 ctx1abcd

39 team_z_force = Team(name="Z-Force", headquarters="Sister Margaret's Bar") 4 ctx1abcd

40 

41 hero_deadpond = Hero( 4 ctx1abcd

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

43 ) 

44 hero_rusty_man = Hero( 4 ctx1abcd

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") 4 ctx1abcd

48 session.add(hero_deadpond) 4 ctx1abcd

49 session.add(hero_rusty_man) 4 ctx1abcd

50 session.add(hero_spider_boy) 4 ctx1abcd

51 session.commit() 4 ctx1abcd

52 

53 session.refresh(hero_deadpond) 4 ctx1abcd

54 session.refresh(hero_rusty_man) 4 ctx1abcd

55 session.refresh(hero_spider_boy) 4 ctx1abcd

56 

57 print("Created hero:", hero_deadpond) 4 ctx1abcd

58 print("Created hero:", hero_rusty_man) 4 ctx1abcd

59 print("Created hero:", hero_spider_boy) 4 ctx1abcd

60 

61 hero_spider_boy.team = team_preventers 4 ctx1abcd

62 session.add(hero_spider_boy) 4 ctx1abcd

63 session.commit() 4 ctx1abcd

64 session.refresh(hero_spider_boy) 4 ctx1abcd

65 print("Updated hero:", hero_spider_boy) 4 ctx1abcd

66 

67 hero_black_lion = Hero(name="Black Lion", secret_name="Trevor Challa", age=35) 4 ctx1abcd

68 hero_sure_e = Hero(name="Princess Sure-E", secret_name="Sure-E") 4 ctx1abcd

69 team_wakaland = Team( 4 ctx1abcd

70 name="Wakaland", 

71 headquarters="Wakaland Capital City", 

72 heroes=[hero_black_lion, hero_sure_e], 

73 ) 

74 session.add(team_wakaland) 4 ctx1abcd

75 session.commit() 4 ctx1abcd

76 session.refresh(team_wakaland) 4 ctx1abcd

77 print("Team Wakaland:", team_wakaland) 4 ctx1abcd

78 

79 

80def remove_team_heroes(): 4 ctx1abcd

81 with Session(engine) as session: 4 ctx1abcd

82 statement = select(Team).where(Team.name == "Wakaland") 4 ctx1abcd

83 team = session.exec(statement).one() 4 ctx1abcd

84 team.heroes.clear() 4 ctx1abcd

85 session.add(team) 4 ctx1abcd

86 session.commit() 4 ctx1abcd

87 session.refresh(team) 4 ctx1abcd

88 print("Team with removed heroes:", team) 4 ctx1abcd

89 

90 

91def delete_team(): 4 ctx1abcd

92 with Session(engine) as session: 4 ctx1abcd

93 statement = select(Team).where(Team.name == "Wakaland") 4 ctx1abcd

94 team = session.exec(statement).one() 4 ctx1abcd

95 session.delete(team) 4 ctx1abcd

96 session.commit() 4 ctx1abcd

97 print("Deleted team:", team) 4 ctx1abcd

98 

99 

100def select_deleted_heroes(): 4 ctx1abcd

101 with Session(engine) as session: 4 ctx1abcd

102 statement = select(Hero).where(Hero.name == "Black Lion") 4 ctx1abcd

103 result = session.exec(statement) 4 ctx1abcd

104 hero = result.first() 4 ctx1abcd

105 print("Black Lion has no team:", hero) 4 ctx1abcd

106 

107 statement = select(Hero).where(Hero.name == "Princess Sure-E") 4 ctx1abcd

108 result = session.exec(statement) 4 ctx1abcd

109 hero = result.first() 4 ctx1abcd

110 print("Princess Sure-E has no team:", hero) 4 ctx1abcd

111 

112 

113def main(): 4 ctx1abcd

114 create_db_and_tables() 4 ctx1abcd

115 create_heroes() 4 ctx1abcd

116 remove_team_heroes() 4 ctx1abcd

117 delete_team() 4 ctx1abcd

118 select_deleted_heroes() 4 ctx1abcd

119 

120 

121if __name__ == "__main__": 4 ctx1abcd

122 main()