Odoo 12: How can I update field in child depending on a parent field?

Question

Hi,

in the child (sale.order.line) class I have a boolean field which should be updated when parent field is changed.

Parent:

class SaleOrder(models.Model):
_inherit = "sale.order"

sub = fields.Many2One(...)

Child:

class SaleOrderLine(models.Model):
_inherit = "sale.order.line"

b = fields.Boolean(compute="_check_sub", default=False)

@api.depends("order_id.sub")
def _check_sub(self):
for rec in self:
if(rec.order_id.sub != False):
rec.b = True

_check_sub is never called. What is the rig

Levi Bensley · Answer

One way is to have a sub field also in order.line and have it related to the sale.order sub field and replace your function with on change so...
class SaleOrderLine(models.Model):
...
sub = fields.Many2one(..., related='order_id.sub', store=False)
@api.multi
@api.onchange('sub')​
def _check_sub(self):​
​...            ​

ti-sq · Answer

Thanks for your reply!
The onchange-method "_check_sub()" is not called.. It is the same problem as before..
I change a parent field and the child-methods are not invoked.

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