How to recompute stored functional field values in Odoo?

Question

Sometimes stored fields must be recomputed, but triggers can not be launched (e.g. in case of SQL injection).

How to recompute them an easy way?

Answer 1

In v8.0 (should work in 9.0 too) you can do it like that:

# Recompute amount_total for account.invoice

env.add_todo(model._fields['amount_total'], object)
model.recompute()

# where
# object - recordset of instances to recompute field for
# model - recordset instances model

Above code can be used in server action directly.