Event Creation Form with nested Ticket_Type

_form.html.erb

<div class="form">
  <div class="form-group-columns">
  <%= form_for [:admin, @event]  do |f| %>
    <%= f.text_field :name, placeholder: "Name" %>
    <br/>
    <br/>
    <%= f.text_area :description, placeholder: "Description" %>
    <br/>
    <%= f.date_select(:date , :start_year => 2016) %>
    <br/>
    <%= f.fields_for :ticket_types do |ticket_type_form| %>
    <ul class="ticket-type-group">
      <li class="ticket-form">
        <%= ticket_type_form.label :type %>
        <%= ticket_type_form.text_field :level %>

        <%= ticket_type_form.label :price %>
        <%= ticket_type_form.number_field :cost %>
          <%# Want to duplicate this to allow for multiple ticket_type param sets.  by hitting FA icon below%>
      </li>
    </ul>
    <span class="fa fa-plus-circle fa-1.5x ticket-form-add"></span>
    <br/>
    <% end %>
    <br/>
    <%= f.submit :save, class: "button" %>
  <% end %>
  </div>
</div>