can display relation between author

app/controllers/desktop/co_authors_controller.rb

@@ -1,6 +1,7 @@
 class Desktop::CoAuthorsController < ApplicationController
   def index
     @co_authors = CoAuthor.where(name_id: current_user.id)
+    @co_author_relations = CoAuthorRelation.all
 
     respond_to do |format|
       format.html { render :layout => false}
@@ -27,6 +28,7 @@ class Desktop::CoAuthorsController < ApplicationController
 
   def edit
     @co_author = CoAuthor.find(params[:id])
+    @co_author_relations = CoAuthorRelation.all
     respond_to do |format|
       format.html { render :layout => false}
     end