/**
* Filters contributions for unique participants
*
* @param Challenge $challenge
* @return ArrayCollection
*/
protected function getUniqueParticipants($challenge)
{
//Filter duplicated participants
$participants = new ArrayCollection();
$challenge->getContributions()->map(function ($c) use($participants) {
if (!$participants->contains($c->getUserId())) {
$participants->add($c->getUserId());
}
});
return $participants;
}
