Composite key relationships using Sqlalchemy - relationships on composite keys using Sqlalchemy

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problem ：

I have this simple model of Author - Books and can't find a way to make firstName and lastName a composite key and use it in relation. I have this simple Author - Books Model , But no firstName and lastName The method of becoming a composite key and using it in related cases .Any ideas? Do you have any ideas ？

from sqlalchemy import create_engine, ForeignKey, Column, String, Integerfrom sqlalchemy.orm import relationship, sessionmakerfrom sqlalchemy.ext.declarative import declarative_baseBase = declarative_base()engine = create_engine('mssql://user:[email protected]')engine.echo = Truesession = sessionmaker(engine)()class Author(Base):    __tablename__ = 'authors'    firstName = Column(String(20), primary_key=True)    lastName = Column(String(20), primary_key=True)    books = relationship('Book', backref='author')class Book(Base):    __tablename__ = 'books'    title = Column(String(20), primary_key=True)    author_firstName = Column(String(20), ForeignKey('authors.firstName'))    author_lastName = Column(String(20), ForeignKey('authors.lastName'))            

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Solution ：

Reference resources ： https://stackoom.com/en/question/VUKP