An example of customizing collection_check_boxes in Rails 4. -- I'm working on converting a rails 3.2 app to Rails 4 and noticed that a couple of helpers from simple_form are now in the Rails core. I wanted to move away from dependencies as much as possible including getting rid of simple_form if possible so I went about converting the old view …

collection_check_boxes.html.erb

<%= f.collection_check_boxes :venue_ids, Venue.all, :id, :name, checked: Venue.all.map(&:id) do |b| %>
  <span>
    <%= b.check_box %>
    <%= b.label %>
  </span>
<% end %>