数组到字符串转换。 symfony2.7

Question

I have a dropdown with a list of entities + icon next to the entity. but when I submit my form I got this error:

An exception has been thrown during the rendering of a template ("Notice: Array to string conversion") in src\\FLY\\BookingsBundle\\Resources\\views\\Post\\show.html.twig at line 38.

CRITICAL - Uncaught PHP Exception Twig_Error_Runtime: "An exception has been thrown during the rendering of a template ("Notice: Array to string conversion") in "C:\\xampp\\htdocs\\Symfony\\src\\FLY\\BookingsBundle/Resources/views/Post/show.html.twig" at line 38." at C:\\xampp\\htdocs\\Symfony\\app\\cache\\dev\\classes.php line 4795 .

class Post
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;


    /**
     * @var array
     *
     * @ORM\Column(name="compagny", type="array")
     */
    private $compagny;


    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }


    /**
     * Set compagny
     *
     * @param array $compagny
     * @return Post
     */
    public function setCompagny($compagny)
    {
        $this->compagny = $compagny;

        return $this;
    }

    /**
     * Get compagny
     *
     * @return array
     */
    public function getCompagny()
    {
        return $this->compagny;
    }
}

.

 ->add('compagny', 'choice', [
                    'required' => true,
                    'multiple' => true,
                    'label' => 'Ex:Emirates airways',
                    'attr' => [
                        'class' => 'form-control myDropdown',
                        'placeholder' => 'Ex:Emirates airways',
                    ]])

.

{% extends '::base.html.twig' %}

{% block body -%}
    <h1>Post</h1>

    <table class="record_properties">
        <tbody>
            <tr>
                <th>Id</th>
                <td>{{ entity.id }}</td>
            </tr>
            <tr>
                <th>Departure</th>
                <td>{{ entity.airport }}</td>
            </tr>
            <tr>
                <th>Arrival</th>
                <td>{{ entity.airport1 }}</td>
            </tr>
            <tr>
                <th>Departuredate</th>
                <td>{{ entity.departuredate|date('Y-m-d H:i:s') }}</td>
            </tr>
            <tr>
                <th>Arrivaldate</th>
                <td>{{ entity.arrivaldate|date('Y-m-d H:i:s') }}</td>
            </tr>

            <tr>
                <th>Compagny</th>
                <td>{{ entity.compagny }}</td>
            </tr>
        </tbody>
    </table>

        <ul class="record_actions">
    <li>
        <a href="{{ path('post') }}">
            Back to the list
        </a>
    </li>
    <li>
        <a href="{{ path('post_edit', { 'id': entity.id }) }}">
            Edit
        </a>
    </li>
    <li>{{ form(delete_form) }}</li>
</ul>
{% endblock %}

new.html.twig

<div class="col-md-2">
    <h4 class="title">Compagny</h4>
    <div class="form-group form-group-lg form-group-icon-left">
        <i class="fa fa-plane input-icon"></i>
        <label>Airlines</label>
        {{ form_widget(form.compagny, { 'attr': {'class': 'form-control myDropdown',} }) }}
        {{ form_errors(form.compagny) }}
    </div>
</div>

Answer 1

Your $compagny property of Post is an array, just as you defined in the annotation:

/**
 * @var array
 *
 * @ORM\Column(name="compagny", type="array")
 */

read doctrine documentation, this array will be serialized before storing into database.

And you can't render it directly in twig.

You need use for to display the items in the array one by one.

<ul>
{% for item in entity.compagny %}
    <li>{{ item }}</li>
{% endfor %}
</ul>