films-symfony-4-2/templates/videotheque/form.html.twig

    {{ form_start(form, {'attr': {'class': ''}}) }}
    <div class="container-fluid">
        <div class="row">
            <div class="col-3">
                {% form_theme form 'bootstrap_4_horizontal_layout.html.twig' %}

                <div class="form-group row">
                    {{ form_row(form.titre) }}
                    {{ form_row(form.annee) }}
                    {{ form_row(form.lien) }}
                    {% form_theme form 'bootstrap_4_layout.html.twig' %}

                    {{ form_label(form.mediaVideo, 'Bande annonce') }}
                    {{ form_errors(form.mediaVideo) }}
                    {{ form_widget(form.mediaVideo) }}
                </div>
            </div>
            <div class="col">
                <div class="card">
                    <div class="card-header">
                        {{ form_label(form.genres, 'Genres') }}
                    </div>
                    <div class="card-body">
                        {#<a href="#" id="add_genre" class="btn btn-link">Ajouter un genre</a>#}
                        <div class="form-inline">
                            {{ form_errors(form.genres) }}
                            {{ form_widget(form.genres) }}
                        </div>
                    </div>
                </div>
            </div>
            <div class="col">
                <div class="card">
                    <div class="card-header">
                        {{ form_label(form.realisateurs, 'Réalisateurs') }}
                    </div>
                    <div class="card-body">
                        <a href="#" id="add_realisateur" class="btn btn-link">Ajouter un réalisateur</a>
                        <div class="form-inline">
                            {{ form_errors(form.realisateurs) }}
                            {{ form_widget (form.realisateurs) }}
                        </div>
                    </div>
                </div>

            </div>
        </div>
    </div>
    {{ form_rest(form) }}
    {{ form_end(form) }}