/** @return $this */
public function addParticipation(EventParticipation $participation)
{
$email = $participation->getUser()->getEmail();
$callback = function ($key, EventParticipation $participation) use($email) {
return $email === $participation->getUser()->getEmail();
};
if ($this->participations->exists($callback)) {
return;
}
$this->participations->add($participation);
return $this;
}
