<form method="post" action="{{ path("createBook") }}">
    <input type="text" name="title" placeholder="title">
    <input type="text" name="description" placeholder="description">
    <input type="number" name="rating" placeholder="rating">


    <select name="author">
        {% for author in authors %}
            <option value="{{ author.id }}">
                {{ author.name }}
            </option>
        {% endfor %}
    </select>
    <input type="submit">
</form>