So I have two categories for the maintenance equipments:​

• Laptop

• Software (Office etc.)

I added many2many field inside equipments model that allows me to pick software installed on a particular device:

class custom_category_fields(models.Model):
    _inherit = 'maintenance.equipment'

    soft_ids = fields.Many2many(comodel_name='maintenance.equipment', relation='custom_maintenance_equipment_soft_eq_rel', column1="eq_id", column2="soft_id", string='Software')

But I would like to also have reverse connection - so I could check from the software point of view where it is installed.

I'm having trouble figuring out how to define this additional field. I have something like this:

    device_ids = fields.Many2many(comodel_name='maintenance.equipment', relation='custom_maintenance_equipment_soft_eq_rel', column1="eq_id", column2="soft_id", string='Devices')

But obviously it does not contain information about devices with that software yet. How do I do this so both devices and software would hold information about the connection?

I thought about extending create and write method to fill in the values but I don't know python syntax to archive this.