Customizing form collections in Symfony2

form_div_layout.html.twig

{% block collection_widget %}
{% spaceless %}
	{% if prototype is defined %}
	    {% set attr = attr|merge({'data-prototype': block('collection_item_widget') }) %}
	{% endif %}
    <div class="collection" {{ block('widget_container_attributes') }}>
		{{ form_errors(form) }}
		<table>
			<thead>
				<tr>
					<th>Name</th>
					<th>Value</th>
					<th>Action</th>
				</tr>
			</thead>
			<tbody>
			{% for rows in form %}
				block('collection_item_widget')
			{% endfor %}
			</tbody>
		</table>
		{{ form_rest(form) }}
		<a class="collection_add btn" title="Add" href="#">Add</a>
    </div>
{% endspaceless %}
{% endblock collection_widget %}

{% block collection_item_widget %}
{% spaceless %}
    <tr>
	    {% for row in prototype %}
        <td>
	        {{ form_widget(row) }}
        </td>
	    {% endfor %}
	    <td>
			<a class="remove" title="Remove" href="#">Delete</a>
		</td>
    </tr>
{% endspaceless %}
{% endblock collection_item_widget %}