SQLALchemy - 使用另一个表中 2 个字段的行填充关系

Question

我有以下表格：

class Match(Base):
    __tablename__ = 'match'

    match_id = Column(Integer, primary_key=True)
    home_team_id = Column(Integer, ForeignKey('team.team_id'))
    away_team_id = Column(Integer, ForeignKey('team.team_id'))

    home_team = relationship('Team', foreign_keys=[home_team_id])
    away_team = relationship('Team', foreign_keys=[away_team_id])

class Team(Base):
    __tablename__ = 'team'

    team_id = Column(Integer, primary_key=True)
    name = Column(String)

    matches = relationship(...)

如果团队的team_id 匹配home_team_id 或away_team_id，我将如何定义Team 中的关系，以便team.matches 将从match 表中提取每一行？

谢谢。

Answer 1

好的，我想通了。需要的关系是：

matches = relationship(
    'Match', 
    primaryjoin='or_(
        Team.team_id == Match.home_team_id, Team.team_id == Match.away_team_id
    )'
)