app/views/layers/_edit.html.erb

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<div class="layers edit list-editor" data-components="editLayers"
                         data-editlayers-options='<%= {data: layers_manager_data}.to_json %>'>

  <%= f.input :layers_attributes, as: :hidden, input_html: { class: 'layers-value', value: f.object.layers_values.to_json } %>

  <div class="layers-list" data-components="sortable"></div>

  <button class="add-new-btn button" title="<%= t 'layers.title.add' %>">
    <%= icon 'plus',  t('layers.add') %>
  </button>

</div>