tom_column_' ~ c.id }}" class="form-control">
                <option value="None" {% if book['custom_column_' ~ c.id]|length == 0 %} selected {% endif %}></option>
                <option value="True"  {% if book['custom_column_' ~ c.id]|length > 0 %}{% if book['custom_column_' ~ c.id][0].value ==true %}selected{% endif %}{% endif %} >{{_('Yes')}}</option>
                <option value="False"  {% if book['custom_column_' ~ c.id]|length > 0 %}{% if book['custom_column_' ~ c.id][0].value ==false %}selected{