openproject/app/views/attribute_help_texts/_form.html.erb

<%#-- copyright
OpenProject is an open source project management software.
Copyright (C) 2012-2020 the OpenProject GmbH

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License version 3.

OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
Copyright (C) 2006-2017 Jean-Philippe Lang
Copyright (C) 2010-2013 the ChiliProject Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

See docs/COPYRIGHT.rdoc for more details.

++#%>
<%= error_messages_for 'attribute_help_text' %>

<section class="form--section" id="custom_field_form">
  <div class="form--field -required">
    <% if local_assigns[:editing] %>
      <%= f.select :attribute_name,
                   [[@attribute_help_text.attribute_caption, @attribute_help_text.attribute_name]],
                   {},
                   disabled: true
      %>
    <% else %>
      <%= f.select :attribute_name, selectable_attributes(@attribute_help_text), container_class: '-middle' %>
    <% end %>
  </div>
  <div class="form--field -required -visible-overflow">
    <%= f.text_area :help_text, cols: 100, rows: 20, class: 'wiki-edit', with_text_formatting: true %>
  </div>
</section>