add symbol in collection_select helper

<%= f.select :report_ids, @reports.map { |r| ["#{r.name}
#{r.surname}", r.id] } , {}, :multiple => true, :size => 10 %>

hi
I am new to rails, here why dont we use a method which is not a
table attribute but a user defined one which is defined as we need
like display of both surname and name concatenated.
i tried but i am getting error pls clarify me thanks in advance

MaurĂ­cio Linhares wrote: