Question

In rails, I’ve got this checkbox tag, where the checked value should be true if an element is included in post array.

- checked = (params[:comments] && params[:comments][:pictures] && params[:comments][:pictures].include?(comment.id))
=check_box_tag "comments[pictures][]", comment.id, checked

The checked part looks very ugly. How to catch the error if params[:comments] or params[:comments][:pictures] is not set? I tried

- checked = (params[:comments][:pictures].include?(comment.id)) || false

But it does not work.

Answer 1

I would recommend you to install simple_form and use:

= simple_form_for @comment do |f|
  = f.association :pictures, :as => 'boolean'