我想使用sqlalchemy的WITH支持对插入的postgres。现在，我不想检查要插入的表上的列，而是要检查 related 表上是否存在冲突。也就是说，表上具有外键关系的字段。
例如：
MATCH p1=(:DestinationNode)-[:IS_AT]->
(:CentiDegreeNode{x: 4714, y: 843})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4715, y: 843})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4716, y: 843})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4717, y: 843})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4718, y: 843})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4718, y: 844})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4719, y: 844})
WITH COLLECT(p1) AS p1s
MATCH p2=(:DestinationNode)-[:IS_AT]->
(:CentiDegreeNode{x: 4718, y: 839})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4718, y: 840})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4719, y: 840})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4719, y: 841})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4719, y: 842})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4719, y: 843})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4719, y: 844})
WITH p1s, COLLECT(p2) AS p2s
MATCH p3=(:CentiDegreeNode{x: 4719, y: 844})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4719, y: 845})-[:CONNECTED_TO*1]-
(:CentiDegreeNode{x: 4719, y: 846})
RETURN p1s, p2s, COLLECT(p3) AS p3s
当已经有一个on conflict和一个class User(db.Model):
__tablename__ = 'User'
class UserFirstName(db.Model):
__tablename__ = 'UserFirstName'
user_id = Column(Integer, ForeignKey('User.uid'))
user = relationship('User', backref="first_names")
first_name = Column(String)
字段与一个User字段相冲突的User时，我想执行自定义操作，尝试对UserFirstName进行插入我要在orm中插入的实体的first_name中的值。