Show many2one field value based on another field value

show many2one field value based on another field value

@api.onchange('seller')
def onchange_field_seller(self):
    if self.seller:
        # filter products by seller
        product_ids = self.seller.product_details.ids
        return {'domain': {'product': [('id', 'in', product_ids)]}}
    else:
        # filter all products -> remove domain
        return {'domain': {'product': []}}