I have the following validation in a model:
validates_inclusion_of :whatever, :in => [true, false], :message => I18n.t(\'please_select_whatever\')
OK, iain answer works, but I took very long time to figure out where should I put the :select_whatever.
iain
:select_whatever
validates_inclusion_of :whatever, :in => [true, false], :message => :select_whatever
OK your en.yml should look like this:
en.yml
en: errors: messages: select_whatever: "error!!"