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これは私がはSQLAlchemyのエラーに参加執筆:sqlalchemy.exc.InvalidRequestErrorを:私は、このクエリが動作するようになった
class Candidate(Base):
__tablename__ = 'candidates'
id = Column(Integer, primary_key=True)
first = Column(String, nullable=False)
last = Column(String)
title = Column(String)
company = Column(String, nullable=False)
def __repr__(self):
return "<Candidate(first='%s', last='%s', title = '%s', company='%s')>" % (self.first, self.last, self.title, self.company)
## Add user
morgan = Candidate(first='john', last='doe', title='some_title', company='some_company')
session.add(morgan)
session.commit()
を作成した最初のテーブルです:
morgan = session.query(Candidate).filter(Candidate.first=='morgan').first()
しかし、私は、第二を追加しますテーブル、それは動作を停止します。
class Roles(Base):
__tablename__ = 'role'
id = Column(Integer, primary_key=True)
role = Column(String, nullable=False)
user_id = Column(Integer, ForeignKey('candidates.id'))
user = relationship("Candidate", back_populates="role")
def __repr__(self):
return "<Roles(role='%s')>" % (self.role)
私はこれで何か間違ったことをやっていると仮定しています:
Candidate.role = relationship("Roles", order_by=Roles.id, back_populates='user')
が再び
morgan = session.query(Candidate).filter(Candidate.first=='morgan').first()
この検索を試してみて、私はこのエラーを取得
sqlalchemy.exc.InvalidRequestError: One or more mappers failed to initialize - can't proceed with initialization of other mappers. Original exception was: Mapper 'Mapper|Candidate|candidates' has no property 'role'