When something is not right, we will want to interrupt the program with an error message. This is done by raising an exception. Odoo provides a few additional exception classes in addition to the ones available in Python.
These are examples for the most useful ones:
from odoo import exceptions
raise exceptions.Warning('Warning message')
raise exceptions.ValidationError('Not valid message')
The Warning message also interrupts execution but can sound less severe than a ValidationError. All data manipulation done during the method execution is in a database transaction, which is rolled back when an exception occurs. This means that all these database operations will be canceled.
While it's not the best user interface, we ...
