Two method of using checkboxes on forms with Bootstrap 4

_form.html.erb

# Store#performance
# This is the old way of doing checkbox collections.
# Note the hidden field tag to make sure that unchecked items are passed to the server

<fieldset class='form-group mx-sm-3'>
  <legend class='pt-4'>Performance</legend>
  <div class='row'>
    <% hidden_field_tag 'store[performance_ids][]', nil %>
    <% Performance.all.each do |performance| %>
      <div class='col col-sm-6 pt-2'>
        <label class="active">
          <%= check_box_tag 'store[performance_ids][]',
              performance.id,
              @store.performance_ids.include?(performance.id),
              id: dom_id(performance),
              autocomplete: false %>
          <%= performance.name %>
        </label>
      </div>
    <% end %>
  </div>
</fieldset>

# Store#offering
# This new collection_check_boxes helper was created in Rails 4
# It's much cleaner

<fieldset class='form-group mx-sm-3'>
  <legend class='pt-4'>Offerings</legend>
    <div class='row'>
      <%= collection_check_boxes(:store, :offering_ids, Offering.all, :id, :name) do |b| %>
        <div class='col col-sm-6 pt-2'>
          <%= b.check_box %> <%= b.label %>
        </div>
      <% end %>
    </div>
</fieldset>