Raise warning when there is no select record via "Add a line" in one2many tree view!? (Odoo 13)

Question

Hello,
Im trying to create the method which has to check the record has selected or not in one2many tree view. If the record has selected then the method will change state. If not, then it will raise the warning for user.
model_b.py :
name = fields.Many2one('hr.employee')
*o_2_m* = fields.One2many('model.a', 'keya')
state = fields.Selection([
('draf', 'DRAF'),
('confirm', 'CONFIRMED'),
(cancel', 'CANCEL'),
],default='draf')

model_a.py :
name = fields.Many2one('hr.employee')
keya = fields.Many2o

Begineer · Accepted Answer

Hi,
I hope the *change of state* function must be in *model_b.py* and add this as a button function in your xml view of  model_b.
Here you can *raise error or warning* and also *move state* as you required. Just give a try
*from odoo.exceptions import UserError*
@api.multi
def confirm(self)
for rec in self:
if not  rec. o_2_m:
raise UserError(_("You forget to select the record for changing in o2m"
Please select as below"))
rec.state = 'confirm'
return True

Niyas Raphy (Walnut Software Solutions) · Answer

Hi,
Try the below code and see whether it helps,
from odoo.exceptions import ValidationError
def confirm( self ):
for rec in  self :
mod_b = self .env[ "model.b" ].search([( 'o_2_m.name' , '=' , rec.name.id)])
if rec.o_2_m:
for line in rec.o_2_m:
line.write({ 'state' : 'confirm' })
else :
raise ValidationError(_( 'You forget to select the record for changing in o2m.' ))
Reference:
Odoo ORM Methods [1]
Thanks

[1] https://www.youtube.com/watch?v=8V-uOG8KkKA

Leon · Answer

I'd resolved my wish, base on Niyas's support.
The code looks like this:
from odoo.exceptions import ValidationError
def confirm(self):
for rec in self:
mod_b = self.env["model.b"].search([('o_2_m.name', '=', rec.name.id)])
if rec.o_2_m:
mod_b_state = self.env["model.b"].search([])
if mod_b_state:
mod_b_state.write({'state': 'confirm'})
else:
raise ValidationError(_('You forget to select the record for changing in o2m.'))

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