findPreviewEmotion example

try {
            $data = $this->Request()->getParams();

            if (empty($data['id'])) {
                throw new NotFoundException('The emotion must exist before previewing it.');
            }

            $data['previewId'] = $data['id'];
            $data['previewSecret'] = Random::getAlphanumericString(32);
            $data['active'] = false;

            $previewEmotion = $this->findPreviewEmotion((int) $data['id']);
            if ($previewEmotion) {
                $previewEmotion->getElements()->clear();
                $this->getManager()->flush($previewEmotion);

                $data['id'] = $previewEmotion->getId();
            } else {
                unset($data['id']);
            }

            $emotion = $this->saveEmotion($data);