Doctrine\Common\Collections\ArrayCollection::add PHP Method

    public function add($element)
    {
        $this->elements[] = $element;
        return true;
    }

 /**
  * {@inheritdoc}
  */
 public function addTranslation(AbstractTranslation $translation)
 {
     if (!$this->translations->contains($translation)) {
         $translation->setForeignKey($this);
         $this->translations->add($translation);
     }
 }