= form_for @tracking_config do |f|

  .event-fields
    = f.fields_for :tracking_event_configs do |ff|
      = render 'tracking_event_config_block', form: ff

  = f.submit 'Save', class: 'btn btn-danger'


= form_tag get_event_fields_tracking_configs_path, remote: true, method: :get do
  = select_tag :event_name, options_from_collection_for_select(TrackableEvent.all, :event_name, :event_name), prompt: 'Choose event to add'
  = submit_tag 'Add event config'

<%
  tracking_event_config_block = render(
    "tracking_event_config_block",
    form: ActionView::Helpers::FormBuilder.new(
      "tracking_config[tracking_event_configs_attributes][]",
      @tracking_event_config,
      self,
      {}
    )
  )
%>
$('.event-fields').append(
  '<%= j tracking_event_config_block %>'
)