Inherit the model and make changes to the existing field

Question

Hello, I want to inherit the hr.expense and change the existing fields.
for example, I want the tax_ids field (Many2many) to be limited to 1. The user can only select one tax type.
Also, how can I set the default account for the expense. I want to set a particular account for expenses that I have created in the chart of accounts to be the default one for my model
Please help me on this
Thank you

Mily Shajan · Accepted Answer

Hi
You can use api.constrains decorator, it will help to limit the tax to 1
check the following code
class HrExpense(models.Model):
_inherit ='hr.expense'
@api.constrains('tax_ids')
def _check_tax_ids_lines(self):
for record in self:
if len(record.tax_ids) > 1:
raise ValidationError('You can have only one tax.')

Regards

Cybrosys Techno Solutions Pvt.Ltd · Answer

Hi,
To assign a default expense account, add a default
attribute to the corresponding field, and add constraints for tax
fields to prevent adding more than one tax to form.
class HrExpense(models.Model):
_inherit ='hr.expense'
def _default_account_id(self):
return self.env['account.account'].search([
('account_type', 'not in', ('asset_receivable', 'liability_payable', 'asset_cash', 'liability_credit_card')),
('company_id', '=', company_id)], limit=1).id
account_id = fields.Many2one( 'account.acc

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