Coverage for docs_src / tutorial / relationship_attributes / back_populates / tutorial002_py310.py: 100%

1from sqlmodel import Field, Relationship, Session, SQLModel, create_engine, select 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") 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(default=None, foreign_key="team.id") 9 ctx1jklmnopqr

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

20 

21 

22sqlite_file_name = "database.db" 9 ctx1jklmnopqr

23sqlite_url = f"sqlite:///{sqlite_file_name}" 9 ctx1jklmnopqr

24 

25engine = create_engine(sqlite_url, echo=True) 9 ctx1jklmnopqr

26 

27 

28def create_db_and_tables(): 9 ctx1jklmnopqr

29 SQLModel.metadata.create_all(engine) 9 ctx1abcdefghi

30 

31 

32def create_heroes(): 9 ctx1jklmnopqr

33 with Session(engine) as session: 9 ctx1abcdefghi

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

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

36 

37 hero_deadpond = Hero( 9 ctx1abcdefghi

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

39 ) 

40 hero_rusty_man = Hero( 9 ctx1abcdefghi

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

42 ) 

43 hero_spider_boy = Hero(name="Spider-Boy", secret_name="Pedro Parqueador") 9 ctx1abcdefghi

44 session.add(hero_deadpond) 9 ctx1abcdefghi

45 session.add(hero_rusty_man) 9 ctx1abcdefghi

46 session.add(hero_spider_boy) 9 ctx1abcdefghi

47 session.commit() 9 ctx1abcdefghi

48 

49 session.refresh(hero_deadpond) 9 ctx1abcdefghi

50 session.refresh(hero_rusty_man) 9 ctx1abcdefghi

51 session.refresh(hero_spider_boy) 9 ctx1abcdefghi

52 

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

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

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

56 

57 hero_spider_boy.team = team_preventers 9 ctx1abcdefghi

58 session.add(hero_spider_boy) 9 ctx1abcdefghi

59 session.commit() 9 ctx1abcdefghi

60 session.refresh(hero_spider_boy) 9 ctx1abcdefghi

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

62 

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

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

65 team_wakaland = Team( 9 ctx1abcdefghi

66 name="Wakaland", 

67 headquarters="Wakaland Capital City", 

68 heroes=[hero_black_lion, hero_sure_e], 

69 ) 

70 session.add(team_wakaland) 9 ctx1abcdefghi

71 session.commit() 9 ctx1abcdefghi

72 session.refresh(team_wakaland) 9 ctx1abcdefghi

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

74 

75 hero_tarantula = Hero(name="Tarantula", secret_name="Natalia Roman-on", age=32) 9 ctx1abcdefghi

76 hero_dr_weird = Hero(name="Dr. Weird", secret_name="Steve Weird", age=36) 9 ctx1abcdefghi

77 hero_cap = Hero( 9 ctx1abcdefghi

78 name="Captain North America", secret_name="Esteban Rogelios", age=93 

79 ) 

80 

81 team_preventers.heroes.append(hero_tarantula) 9 ctx1abcdefghi

82 team_preventers.heroes.append(hero_dr_weird) 9 ctx1abcdefghi

83 team_preventers.heroes.append(hero_cap) 9 ctx1abcdefghi

84 session.add(team_preventers) 9 ctx1abcdefghi

85 session.commit() 9 ctx1abcdefghi

86 session.refresh(hero_tarantula) 9 ctx1abcdefghi

87 session.refresh(hero_dr_weird) 9 ctx1abcdefghi

88 session.refresh(hero_cap) 9 ctx1abcdefghi

89 print("Preventers new hero:", hero_tarantula) 9 ctx1abcdefghi

90 print("Preventers new hero:", hero_dr_weird) 9 ctx1abcdefghi

91 print("Preventers new hero:", hero_cap) 9 ctx1abcdefghi

92 

93 

94def select_heroes(): 9 ctx1jklmnopqr

95 with Session(engine) as session: 9 ctx1abcdefghi

96 statement = select(Team).where(Team.name == "Preventers") 9 ctx1abcdefghi

97 result = session.exec(statement) 9 ctx1abcdefghi

98 team_preventers = result.one() 9 ctx1abcdefghi

99 

100 print("Preventers heroes:", team_preventers.heroes) 9 ctx1abcdefghi

101 

102 

103def update_heroes(): 9 ctx1jklmnopqr

104 with Session(engine) as session: 9 ctx1abcdefghi

105 hero_spider_boy = session.exec( 9 ctx1abcdefghi

106 select(Hero).where(Hero.name == "Spider-Boy") 

107 ).one() 

108 

109 preventers_team = session.exec( 9 ctx1abcdefghi

110 select(Team).where(Team.name == "Preventers") 

111 ).one() 

112 

113 print("Hero Spider-Boy:", hero_spider_boy) 9 ctx1abcdefghi

114 print("Preventers Team:", preventers_team) 9 ctx1abcdefghi

115 print("Preventers Team Heroes:", preventers_team.heroes) 9 ctx1abcdefghi

116 

117 hero_spider_boy.team = None 9 ctx1abcdefghi

118 

119 print("Spider-Boy without team:", hero_spider_boy) 9 ctx1abcdefghi

120 

121 print("Preventers Team Heroes again:", preventers_team.heroes) 9 ctx1abcdefghi

122 

123 session.add(hero_spider_boy) 9 ctx1abcdefghi

124 session.commit() 9 ctx1abcdefghi

125 print("After committing") 9 ctx1abcdefghi

126 

127 session.refresh(hero_spider_boy) 9 ctx1abcdefghi

128 print("Spider-Boy after commit:", hero_spider_boy) 9 ctx1abcdefghi

129 

130 print("Preventers Team Heroes after commit:", preventers_team.heroes) 9 ctx1abcdefghi

131 

132 

133def main(): 9 ctx1jklmnopqr

134 create_db_and_tables() 9 ctx1abcdefghi

135 create_heroes() 9 ctx1abcdefghi

136 select_heroes() 9 ctx1abcdefghi

137 update_heroes() 9 ctx1abcdefghi

138 

139 

140if __name__ == "__main__": 9 ctx1jklmnopqr

141 main()