Using the Symfony Form object in a Twig template

add.html.twig

{# Post-back to a named route #}
<form action="{{ path('post_add') }}" method="post" {{ form_enctype(form) }}>
    {# Display any messages for validation errors #}
    {{ form_errors(form) }}

    <div>
        {# Show the fields for the 'title' parameter #}
        {{ form_label(form.title) }}
        {{ form_errors(form.title) }}
        {{ form_widget(form.title) }}
    </div>

    <div>
        {# Show the fields for the 'body' parameter #}
        {{ form_label(form.body) }}<br/>
        {{ form_errors(form.body) }}
        {{ form_widget(form.body) }}
    </div>

    {#
      Display any other parts of the form we didn't explicitly 
      show.
     #}
    {{ form_rest(form) }}

    <input type="submit" />
</form>