core/Fields/Definitions/templates/postselect/default.twig
{% extends Form.getLayout() %}
{% block fieldmarkup %}
<select id='{{ Form.getInputFieldId() }}' name='{{ Form.getFieldName() }}'>
{% if Field.getArg('empty', true) %}
<option value='' name=''>Bitte wählen</option>
{% endif %}
{% for o in posts %}
<option {% if (Field.getValue() == o.ID) %} selected="selected" {% endif %}
value='{{ o.ID }}'>{{ o.post_title }}</option>
{% endfor %}
</select>
{% endblock %}