many to many sqlalchemy

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1class Parent(Base):
2    __tablename__ = 'parent'
3    id = Column(Integer, primary_key=True)
4    children = relationship("Child", back_populates="parent")
5
6class Child(Base):
7    __tablename__ = 'child'
8    id = Column(Integer, primary_key=True)
9    parent_id = Column(Integer, ForeignKey('parent.id'))
10    parent = relationship("Parent", back_populates="children")

1association_table = Table('association', Base.metadata,
2    Column('left_id', Integer, ForeignKey('left.id')),
3    Column('right_id', Integer, ForeignKey('right.id'))
4)
5
6class Parent(Base):
7    __tablename__ = 'left'
8    id = Column(Integer, primary_key=True)
9    children = relationship(
10        "Child",
11        secondary=association_table,
12        back_populates="parents")
13
14class Child(Base):
15    __tablename__ = 'right'
16    id = Column(Integer, primary_key=True)
17    parents = relationship(
18        "Parent",
19        secondary=association_table,
20        back_populates="children")

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