Thank you!

And, maybe you know, how to use this in class constructor?

I try to use this

db = sql_db.db_connect('main-db')

cr = db.cursor()

env = api.Environment(cr, SUPERUSER_ID, {})

model = env['ir.ui.menu'].browse(90)

print model.parent_id

And getting error 'ir.ui.menu' object has no attribute 'id'"

Now this code working with decorator '@api.onchange('field')', but I want execute him one time and without any actions on front-end (like changing 'field' like now)