upgrade-domain-operators (U1914)

A domain uses <>, == or an upper-case operator, deprecated in Odoo 19.0.

Applies to Odoo 19.0 and later.

What it does

Reports domain terms with the operators <>, == or an upper-case operator such as ILIKE.

Why is this bad?

Odoo 19.0 deprecated them in favour of !=, = and lower case.

Fix safety

Safe: the operator is replaced.