How to write dropdown menu for currentuser -

i'm noob in ror world , need help. question this: i've form

      <div class="form-container">       <%= form_for([@modulo2.user, @modulo2]) |f| %>       ..........       <div class="form-field">         <h3> modulo1: </h3><br/>       <%= f.select(:modulo1_id, modulo1.all.map{|p| [p.nome_progetto]}, :prompt =>                                                                     "seleziona il modulo1 associato") %>       </div>       </div><br/> 

the result dropdown menu modulo1s need ones current_user. can try??? in adding, when select 1 item dropdown menu have no association values in table.

sorry question can't find answers searching.

i found solution:

                <%= f.select(:modulo1_id, current_user.modulo1s.all.map{|p|                             [p.nome_progetto,p.id]}, :prompt => "seleziona il modulo1 associato") %> 

i've 1 doubt, if need if statement boolean variable before select try??