Model/FilterItem.php
public function jsonSerialize()
    {
        $json = [];

        if (null !== $this->id) {
            $json['id'] = $this->id;
        }
        if (null !== $this->title) {
            $json['title'] = $this->title;
        }
        if (null !== $this->mediaIds && !empty($this->mediaIds)) {
            $json['mediaIds'] = $this->mediaIds;
        }
        if (null !== $this->filterItems && !empty($this->filterItems)) {
            $json['filterItems'] = $this->filterItems;
        }

        return $json;
    }
public function jsonSerialize()
    {
        $json = [];

        if (null !== $this->id) {
            $json['id'] = $this->id;
        }
        if (null !== $this->title) {
            $json['title'] = $this->title;
        }
        if (null !== $this->mediaIds && !empty($this->mediaIds)) {
            $json['mediaIds'] = $this->mediaIds;
        }
        if (null !== $this->filterItems && !empty($this->filterItems)) {
            $json['filterItems'] = $this->filterItems;
        }

        return $json;
    }
Gets all data that should be available in a json representation.

@return array an associative array of the available variables