Hello, i have 2 classes:

class ModelA:

         _name = "model.a"

​first_field = fields.One2many(

​ ​comodel_name="model.b",

​ ​inverse_name="second_field",

​ ​ondelete="cascade"

​ ​)

class ModelB:

​_name = "model.b"

​second_field = fields.Many2one(

​ ​comodel_name="model.a",

​ ​ondelete="cascade"

​ ​)

If one2many is deleted, many2one will also be deleted. However, if many2one is deleted, the data in one2many still remains. How to delete the one2many if many2one has been deleted?