Coverage for docs_src/tutorial/relationship_attributes/cascade_delete_relationships/tutorial003.py: 100%

1from typing import List, Optional 7 ctx1abcdefg

2 

3from sqlmodel import Field, Relationship, Session, SQLModel, create_engine, select, text 7 ctx1abcdefg

4 

5 

6class Team(SQLModel, table=True): 7 ctx1abcdefg

7 id: Optional[int] = Field(default=None, primary_key=True) 7 ctx1abcdefg

8 name: str = Field(index=True) 7 ctx1abcdefg

9 headquarters: str 7 ctx1abcdefg

10 

11 heroes: List["Hero"] = Relationship(back_populates="team", passive_deletes="all") 7 ctx1abcdefg

12 

13 

14class Hero(SQLModel, table=True): 7 ctx1abcdefg

15 id: Optional[int] = Field(default=None, primary_key=True) 7 ctx1abcdefg

16 name: str = Field(index=True) 7 ctx1abcdefg

17 secret_name: str 7 ctx1abcdefg

18 age: Optional[int] = Field(default=None, index=True) 7 ctx1abcdefg

19 

20 team_id: Optional[int] = Field( 7 ctx1abcdefg

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

22 ) 

23 team: Optional[Team] = Relationship(back_populates="heroes") 7 ctx1abcdefg

24 

25 

26sqlite_file_name = "database.db" 7 ctx1abcdefg

27sqlite_url = f"sqlite:///{sqlite_file_name}" 7 ctx1abcdefg

28 

29engine = create_engine(sqlite_url, echo=True) 7 ctx1abcdefg

30 

31 

32def create_db_and_tables(): 7 ctx1abcdefg

33 SQLModel.metadata.create_all(engine) 7 ctx1abcdefg

34 with engine.connect() as connection: 7 ctx1abcdefg

35 connection.execute(text("PRAGMA foreign_keys=ON")) # for SQLite only 7 ctx1abcdefg

36 

37 

38def create_heroes(): 7 ctx1abcdefg

39 with Session(engine) as session: 7 ctx1abcdefg

40 team_preventers = Team(name="Preventers", headquarters="Sharp Tower") 7 ctx1abcdefg

41 team_z_force = Team(name="Z-Force", headquarters="Sister Margaret's Bar") 7 ctx1abcdefg

42 

43 hero_deadpond = Hero( 7 ctx1abcdefg

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

45 ) 

46 hero_rusty_man = Hero( 7 ctx1abcdefg

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

48 ) 

49 hero_spider_boy = Hero(name="Spider-Boy", secret_name="Pedro Parqueador") 7 ctx1abcdefg

50 session.add(hero_deadpond) 7 ctx1abcdefg

51 session.add(hero_rusty_man) 7 ctx1abcdefg

52 session.add(hero_spider_boy) 7 ctx1abcdefg

53 session.commit() 7 ctx1abcdefg

54 

55 session.refresh(hero_deadpond) 7 ctx1abcdefg

56 session.refresh(hero_rusty_man) 7 ctx1abcdefg

57 session.refresh(hero_spider_boy) 7 ctx1abcdefg

58 

59 print("Created hero:", hero_deadpond) 7 ctx1abcdefg

60 print("Created hero:", hero_rusty_man) 7 ctx1abcdefg

61 print("Created hero:", hero_spider_boy) 7 ctx1abcdefg

62 

63 hero_spider_boy.team = team_preventers 7 ctx1abcdefg

64 session.add(hero_spider_boy) 7 ctx1abcdefg

65 session.commit() 7 ctx1abcdefg

66 session.refresh(hero_spider_boy) 7 ctx1abcdefg

67 print("Updated hero:", hero_spider_boy) 7 ctx1abcdefg

68 

69 hero_black_lion = Hero(name="Black Lion", secret_name="Trevor Challa", age=35) 7 ctx1abcdefg

70 hero_sure_e = Hero(name="Princess Sure-E", secret_name="Sure-E") 7 ctx1abcdefg

71 team_wakaland = Team( 7 ctx1abcdefg

72 name="Wakaland", 

73 headquarters="Wakaland Capital City", 

74 heroes=[hero_black_lion, hero_sure_e], 

75 ) 

76 session.add(team_wakaland) 7 ctx1abcdefg

77 session.commit() 7 ctx1abcdefg

78 session.refresh(team_wakaland) 7 ctx1abcdefg

79 print("Team Wakaland:", team_wakaland) 7 ctx1abcdefg

80 

81 

82def delete_team(): 7 ctx1abcdefg

83 with Session(engine) as session: 7 ctx1abcdefg

84 statement = select(Team).where(Team.name == "Wakaland") 7 ctx1abcdefg

85 team = session.exec(statement).one() 7 ctx1abcdefg

86 session.delete(team) 7 ctx1abcdefg

87 session.commit() 7 ctx1abcdefg

88 print("Deleted team:", team) 7 ctx1abcdefg

89 

90 

91def select_deleted_heroes(): 7 ctx1abcdefg

92 with Session(engine) as session: 7 ctx1abcdefg

93 statement = select(Hero).where(Hero.name == "Black Lion") 7 ctx1abcdefg

94 result = session.exec(statement) 7 ctx1abcdefg

95 hero = result.first() 7 ctx1abcdefg

96 print("Black Lion has no team:", hero) 7 ctx1abcdefg

97 

98 statement = select(Hero).where(Hero.name == "Princess Sure-E") 7 ctx1abcdefg

99 result = session.exec(statement) 7 ctx1abcdefg

100 hero = result.first() 7 ctx1abcdefg

101 print("Princess Sure-E has no team:", hero) 7 ctx1abcdefg

102 

103 

104def main(): 7 ctx1abcdefg

105 create_db_and_tables() 7 ctx1abcdefg

106 create_heroes() 7 ctx1abcdefg

107 delete_team() 7 ctx1abcdefg

108 select_deleted_heroes() 7 ctx1abcdefg

109 

110 

111if __name__ == "__main__": 7 ctx1abcdefg

112 main()