如何更正此 sqlalchemy.exc.NoForeignKeysError？

Question

为什么我会得到 TraceBack

sqlalchemy.exc.NoForeignKeysError: Could not determine join condition
between parent/child tables on relationship County.Legislators - 
there are no foreign keys linking these tables.

Ensure that referencing columns are associated with a
ForeignKey or ForeignKeyConstraint, or specify a 'primaryjoin' expression.

具有以下型号：

class County(Base):
    __tablename__ = 'tblCounty'
    CountyCode = Column('CountyCode', String, primary_key=True)
    Legislators = relationship('Legislators', backref='County', lazy='dynamic')

class Legislators(Base):
    __tablename__ = 'VLegislators'
    EmployeeNo = Column('EmployeeNo', String, primary_key=True)
    CountyCode = Column('CountyCode', String, ForeignKey('County.CountyCode'))

我正在尝试映射新罕布什尔州提供的面向 MS SQL 的 public 数据库。所以不允许架构更改。

为什么在 class 立法者中明确定义了外键关系却抱怨缺少外键关系？

Answer 1

据我所知，您应该在 ForeignKey 中使用表名：

CountyCode = Column('CountyCode', String, ForeignKey('tblCounty.CountyCode'))

如何更正此 sqlalchemy.exc.NoForeignKeysError？

How do I correct this sqlalchemy.exc.NoForeignKeysError?

python

sqlalchemy