问题描述
使用 sqlAlchemy 1.3 我有关系表的多对多映射:
at = Table('asstable',Metadata,Column('number',db.Numeric(38,0),ForeignKey('mynumber.objectid')),Column('list',ForeignKey('mylist.objectid'))
)
class MyList(Base):
__tablename__ = 'mylist'
objectid = Column(Numeric(38,primary_key=True)
...
numbers = relationship('MyList',secondary=at,primaryjoin = "MyList.objectid == at.list")
class MyNumber(Base):
__tablename__ = 'mynumber'
objectid = Column(Numeric(38,primary_key=True)
...
lists = relationship('MyList',primaryjoin = "MyNumber.objectid == at.number")
错误是:
Could not determine join condition between parent/child tables on relationship Mylist.numbers - there are no foreign keys linking these tables via secondary table
如果关系中有对象不是类,如何定义primaryjoin?
解决方法
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