Ruby on Rails

Hi, when u say u get a nil list, does the dropdown select render but it does not contain any items ?

I'm not familiar with "awesome_nested_set" but I have tried to do something with a select in the past and I found "The Odin project" examples were helpful I've pasted the code below, it creates an array with the model name and id, and here's a link to the page : advanced-forms

I hope it helps

 # app/controllers/posts_controller.rb
  ...
  def new
    @user_options = User.all.map{ |u| [ u.name, u.id ] }
    @post = Post.new
  end
  ...

  # app/views/posts/new.html.erb
  ...
  <%= select_tag(:author_id, options_for_select(@user_options)) %>