can select relection from relation db

app/controllers/desktop/co_authors_controller.rb

@@ -18,6 +18,7 @@ class Desktop::CoAuthorsController < ApplicationController
 
   def new
     @co_author = CoAuthor.new
+    @co_author_relations = CoAuthorRelation.all
 
     respond_to do |format|
       format.html { render :layout => false}