In the example included in the 0.7 documentation, I can't figure out how
the code backref="left_nodes" works ?
Notably, because I can't find a reference to left_nodes...
from sqlalchemy import Integer, ForeignKey, String, Column, Tablefrom
sqlalchemy.ext.declarative import declarative_basefrom sqlalchemy.orm import
relationship
Base = declarative_base()
node_to_node = Table("node_to_node", Base.metadata,
Column("left_node_id", Integer, ForeignKey("node.id"), primary_key=True),
Column("right_node_id", Integer, ForeignKey("node.id"), primary_key=True))
class Node(Base):
__tablename__ = 'node'
id = Column(Integer, primary_key=True)
label = Column(String)
right_nodes = relationship("Node",
secondary=node_to_node,
primaryjoin=id==node_to_node.c.left_node_id,
secondaryjoin=id==node_to_node.c.right_node_id,
backref="left_nodes"
)
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