anchor.diff:                     { id: 'search_media_editor_ids',
                        multiple: true,
                        class: 'selectize',
  -                     disabled: true } %>
  +                     disabled: true,
  +                     required: true } %>
         <div class="custom-control custom-checkbox mb-2">
           <%= f.check_box :all_editors,
                           id: 'search_all_media_editors',
  
positive.code:       <%= helpdesk(t('admin.medium.info.search_tags'), true) %>
        <%= f.select :tag_ids,
                     options_for_select([[]]),
                     {},
                     { multiple: true,
                       class: 'selectize',
                       style: 'display: none;',
                       disabled: true,
                       data: { filled: false,
                               ajax: true,
                               model: 'tag',
  
negative.code:       <% if purpose == 'clicker' %>
          <%= f.hidden_field :types, value: ['Question'] %>
        <% end %>
        <div class="custom-control custom-checkbox mb-2">
          <%= f.check_box :all_types,
                          id: 'search_all_media_types',
                          class: 'custom-control-input',
                          checked: purpose.in?(['media', 'clicker']),
                          data: { id: 'search_media_types'} %>
          <%= f.label :all_media_types,
                      t('basics.all'),
                      { class: 'custom-control-label' } %>
        </div>
      </div>
      <div class="col-6 col-lg-3 form-group">
        <%= f.label :teachable_ids, t('basics.associated_to') %>
  