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PORender a many-to-many relation with extra fields into a form
 

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    <p>I'm wondering what is the best way to create a form that handle a many-to-many relation with extra field in symfony2.</p> <p>For the example let's say I would like to create a notifying feature for users. I have the <code>User</code> and the <code>Notification</code> entities. Also in order to be able to add extra parameters in the many-to-many relation between entities, I created a third entity <code>UserNotification</code>. The extra parameter indicates if the notification has been read or not by the users.</p> <pre><code>* @ORM\Entity() */ class Notification { /** @Id @Column(type="integer") */ private $id; /** @OneToMany(targetEntity="UserNotification", mappedBy="notification") */ private $usernotifications; /** @Column() */ private $message; ... } * @ORM\Entity() */ class User { /** @Id @Column(type="integer") */ private $id; /** @OneToMany(targetEntity="UserNotification", mappedBy="user") */ private $usernotifications; /** @Column() */ private $name; ... } * @ORM\Entity() */ class UserNotification { /** @ManyToOne(targetEntity="User", inversedBy="usernotifications") private $user; /** @ManyToOne(targetEntity="Message", inversedBy="usernotifications") private $message; /** @Column(type="boolean") */ private $isRead; ... } </code></pre> <p>This way I am able to get this kind of data</p> <pre><code> User +----+---------+ | id | name | +----+---------+ | 1 | John | | 2 | Paul | +----+---------+ Notification +----+----------------------+ | id | message | +----+----------------------+ | 1 | Cool stuff | | 2 | Lorem ipsum | +----+----------------------+ UserNotification +---------+-----------------+---------+ | user_id | notification_id | isRead | +---------+-----------------+---------+ | 1 | 1 | 1 | | 2 | 1 | 0 | | 1 | 2 | 0 | | 2 | 2 | 1 | +---------+-----------------+---------+ </code></pre> <p>Ok now here is the problem, how to make a form which allow to send a notification to some users? With a classic many-to-many relation it was not a problem. I had a <code>NotificationType</code> with the following <code>builder</code>:</p> <pre><code> $builder-&gt;add('users', 'entity', array( 'class' =&gt; 'User', 'property' =&gt; 'name', 'multiple' =&gt; 'true', )) -&gt;add('message', 'text'); </code></pre> <p>But since I had to create the intermediate <code>UserNotification</code> entity, I have no idea how to do it. Thanks for your help ;)</p>
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