src/Model/Zone.php
public function addMember(ZoneMemberEntityInterface $member)
    {
        if (!$this->hasMember($member)) {
            $member->setParentZone($this);
            $this->members->add($member);
        }

        return $this;
    }
public function addMember(ZoneMemberEntityInterface $member)
    {
        if (!$this->hasMember($member)) {
            $member->setParentZone($this);
            $this->members->add($member);
        }

        return $this;
    }
{@inheritdoc}