<%= bootstrap_form_with(model: checklist) do |form| %> <%= form.text_field :code %> <%= form.text_field :name %> <%= form.text_area :description %>

Checks

<% checklist.checklist_entries.each do |entry| %> <%= form.fields_for(:checklist_entries, entry) do |eform| %> <%= eform.number_field :position %> <%= eform.collection_select :check_id, Check.all, :id, :name %> <% end %> <% end %> <%= form.submit %> <% end %>