plataformatec/simple_form — comment on commit 0fabc1b8590081ad24cfc00a77398a57b11fcbeb
File: lib/generators/simple_form/templates/config/initializers/simple_form.rb line 24
By josevalim:

In the docs I am always using :lookup. Unfortunately, the true value does not work with readonly as it would set it to true instead of doing the lookup.