Odoo 13 raise an error and diplay it in UI

Question

I want to raise an error if something specific happens and also show it in the UI. how can I do it?

Sudhir Arya (ERP Harbor Consulting Services) · Accepted Answer

You can raise any odoo exception which will show the error message in the popup.
*Ex:*
from odoo.exceptions import ValidationError
raise ValidationError("This is error message.")

Kiran K · Answer

UserError exception should be used in all cases where some action should not be allowed, when it goes against logic.
if not self.checkout_ids:
raise exceptions.UserError('Select at least one Checkout to send messages to.')
if not self.message_body:
raise exceptions.UserError('Write a message body to send.')  To Know More About different types of  exceptions refer  :
https://www.cybrosys.com/blog/raising-exceptions-odoo-13

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