data-parsley-mincheck checks all checkboxes by default

I have Rails 4 and Parsley-Rails installed.

My form has multiple checkboxes,user needs to check at least 3 to save form in database..

But my code don't work. It checks all checkboxes by default.

My form:

<%= form_for(@advertisement, :html => {"data-parsley-validate" => true,:multipart => true},remote: true, format: :json) do |f| %>

 <% @services.each do |service| %>
                  <li>
                     <%= check_box_tag 'service_ids[]', service.id ,:html =>{:'data-parsley-mincheck'=>3}%>
                      <%= h service.id %>


                  </li>
           <% end %>

<%end%>

Generated HTML looks like this:

  <input checked="checked" id="service_ids_" name="service_ids[]" type="checkbox" value="2" data-parsley-multiple="service_ids" data-parsley-id="7696">

    <input checked="checked" id="service_ids_" name="service_ids[]" type="checkbox" value="3" data-parsley-multiple="service_ids" data-parsley-id="7696">

I have tried many other ways to set mincheck:

  <%= check_box_tag 'service_ids[]', service.id ,:'data-parsley-mincheck'=>3%>

but still can't find working solution..

Any ideas ? Thanks,