personal_plugin_generator/app/views/admin/personal_plugin_fields/copy.html.erb

<%= form_for @personal_plugin_field, url: admin_personal_plugin_fields_path, html: {class: "form-horizontal main-forms previewable"} do |f| %>
  <fieldset>
    <%= f.hidden_field :copy_id, :value => params[:personal_plugin_field_id] %>
    <%= render partial: 'form', locals: {f: f} %>
  </fieldset>
<% end %>