Material

{
    "id": "string",
    "topicId": "string",
    "type": "TEXT",
    "title": "string",
    "content": "string",
    "fileUrl": "string",
    "fileName": "string",
    "linkUrl": "string",
    "startAt": "2019-08-24T14:15:22.123Z",
    "order": 0,
    "attachments": [
        {
            "id": "string",
            "kind": "FILE",
            "fileUrl": "string",
            "fileName": "string",
            "fileSize": 0,
            "mimeType": "string",
            "linkUrl": "string"
        }
    ],
    "isCompleted": true,
    "isBookmarked": true,
    "createdAt": "2019-08-24T14:15:22.123Z",
    "updatedAt": "2019-08-24T14:15:22.123Z"
}