Nextras\Orm\Relationships\HasMany::getCollection PHP Method

    protected function getCollection($forceNew = false)
    {
        if ($this->collection !== null && !$forceNew) {
            return $this->collection;
        }
        if ($this->parent->isPersisted()) {
            $collection = $this->createCollection();
        } else {
            $collection = new EmptyCollection();
        }
        if ($this->toAdd || $this->toRemove || $this->added || $this->removed) {
            $all = [];
            foreach ($collection as $entity) {
                $all[spl_object_hash($entity)] = $entity;
            }
            foreach ($this->added as $hash => $entity) {
                $all[$hash] = $entity;
            }
            foreach ($this->removed as $hash => $entity) {
                unset($all[$hash]);
            }
            foreach ($this->toAdd as $hash => $entity) {
                $all[$hash] = $entity;
            }
            foreach ($this->toRemove as $hash => $entity) {
                unset($all[$hash]);
            }
            $collection = new ArrayCollection(array_values($all), $this->getTargetRepository());
            $collection = $this->applyDefaultOrder($collection);
        }
        return $this->collection = $collection;
    }