api.onchange not working on many2many - odoo 13

Question

api onchange not working on many2many - odoo 13.
Trying to update sale_line's m2m field when product is changed in form view. It's not working.
@api.onchange("product_id")
def _fetch_mf_ids(self):
for rec in self:
rec.mf_ids = [
(6, 0, [x.id for x in rec.product_id.mf_ids])
]
Getting non-stored values for this m2m rec in sale_order_line when I print rec.mf_ids
product.mf.pgm(, )

Cybrosys Techno Solutions Pvt.Ltd · Answer

1.
Make sure that the mf_ids field is correctly defined as a Many2many field in both the product.product model and the sale.order.line model.

class SaleOrderLine(models.Model):
_inherit = 'sale.order.line'
mf_ids = fields.Many2many(
' product.mf [1] .pgm',
string="Manufacturing Programs",
)
class ProductProduct(models.Model):
_inherit = 'product.product'
mf_ids = fields.Many2many(
'product.mf.pgm',
string="Manufacturing Programs",
)
Try this:
@api.onchange("product_id")
def _fetch_mf_ids(self):

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