app/assets/javascripts/templates/bingo/field.hbs
<fieldset class="bingo-field-{{index}} nested-item">
<label for="bingo[words][{{index}}][word]" class="condensed">Word</label>
<input type="text" name="bingo[words][{{index}}][word]" value="{{word}}" />
<a href="#" class="bingo-field-{{index}}-delete btn btn-danger nested-item-delete">Delete</a>
</fieldset>
<script type="text/javascript">
$(".bingo-field-{{index}}-delete").click(function() {
$(".bingo-field-{{index}}").remove();
});
</script>