Easy adding/removing in nested forms for simple_form

forms_helper.rb

module FormsHelper

  def nested_fields_for(form, association, &block)
    field_html = form.simple_fields_for(association, &block)
    new_html = form.simple_fields_for(association, new_association_object(form, association), :child_index => 'new', &block)

    (field_html + nav_for_new_record(new_html)).html_safe
  end

  def nav_for_new_record(html_for_add)
    "<nav><ol><li>#{menu_item(:form, :add, '#', :"data-content" => "#{html_for_add}", :class => 'add_fields')}</li></ol></nav>".html_safe
  end

  def nav_for_existing_record(form)
    "<nav><ol><li>#{menu_item(:form, :destroy, '#', :class => 'destroy_fields', :"data-id" => form.object_name)}</li></ol></nav>".html_safe
  end

  def pluralized_association_name(model, association)
    model.class.reflect_on_association(association).klass.model_name.human(:count => 2)
  end

  def new_association_object(form, association)
    form.object.class.reflect_on_association(association).klass.new
  end

end