SQLAlchemyの継承クラスにデータを追加する

Question

人と住所を格納するデータベースを作成しようとしています。私は継承されたクラスを使用して両方のアドレスを作成しました。私はその後、同僚にアドレスを追加する

adr1 = Home_Address(country='France', city='Paris') 
adr2 = Work_Address(country='France', city='Lyon') 
col = Colleague(first_name='Joe', last_name='Dalton') 
col.home_address = adr1 
col.work_address = adr2 

を試してみたが、これは起こる

from sqlalchemy.ext.declarative import declarative_base 
from sqlalchemy import ForeignKey, Column, Integer, String, Float 
from sqlalchemy.orm import relationship 

Base = declarative_base() 

class Colleague(Base): 
""" Generic Colleague """ 
    __tablename__ = 'colleagues' 
    id = Column(Integer, primary_key=True) 
    first_name = Column(String(50)) 
    last_name = Column(String(50)) 
    home_address = relationship('Home_Address', back_populates='colleague') 
    work_address = relationship('Work_Address', back_populates='colleague') 

class Address(Base): 
    """ Generic Address """ 
    __tablename__ = 'addresses' 
    id = Column(Integer, primary_key=True) 
    adr_type = Column('type', String(50)) 
    country = Column(String(50)) 
    state = Column(String(50)) 
    county = Column(String(50)) 
    city = Column(String(50)) 
    district = Column(String(50)) 
    street = Column(String(50)) 
    house_number = Column(Integer) 
    postal_code = Column(String(50)) 

    __mapper_args__ = { 
     'polymorphic_on' : adr_type 
    } 

    class Home_Address(Address): 
    __tablename__ = 'home_addresses' 
    id = Column(Integer, ForeignKey('addresses.id'), primary_key=True) 
    colleague_id = Column(Integer, ForeignKey('colleagues.id')) 
    colleague = relationship('Colleague', back_populates='home_address') 
    __mapper_args__ = { 
     'polymorphic_identity' : 'home_addresses' 
    } 

class Work_Address(Address): 
    __tablename__ = 'work_addresses' 
    id = Column(Integer, ForeignKey('addresses.id'), primary_key=True) 
    colleague_id = Column(Integer, ForeignKey('colleagues.id')) 
    colleague = relationship('Colleague', back_populates='work_address') 
    __mapper_args__ = { 
     'polymorphic_identity' : 'work_addresses' 
    } 

：

TypeError: Incompatible collection type: Home_Address is not list-like 

col.home_addressではなく、私のオブジェクトを与えるのは、空のリストを与えますHome_Address、どうすれば動作させることができますか？ それを行う簡単な方法がありますか？

Answer 1

同僚 - >アドレスは1対多の関係ですか？それはリストを期待するので、おそらくこのようなものを試してみてください：

adr1 = Home_Address(country='France', city='Paris') 
adr2 = Work_Address(country='France', city='Lyon') 
col = Colleague(first_name='Joe', last_name='Dalton') 
col.home_address = [adr1] 
col.work_address = [adr2]