搜索驱动器和共享驱动器时如何正确检索数组长度？

Question

我有一个场景，我在 Google 云端硬盘和共享云端硬盘中搜索文件夹。我有以下参数 - 标题包含“文件夹名称”，trashed = false 和 mimeType =“application/vnd.google-apps.folder”

我将其设置为创建一个新工作表来保存结果。我认为其中一个“文件夹”保存在共享驱动器中，因此我会收到以下错误消息：Cannot read property 'length' of undefined.

如果“childFolder.owners[0].emailAddress”不适用（如果文件夹位于共享驱动器中），我该如何编写代码并将此字段设为空白并继续发布数组长度？我的代码停在 childFolder.owners[0].emailAddress。

抱歉，这是我第一次尝试使用云端硬盘 API 进行搜索 - 云端硬盘和共享云端硬盘。我希望我的问题是有道理的，如果不是我的道歉。

非常感谢任何输入。

这是我的部分代码：

do {
    var rows = [];
    var pageToken;
    var count = 0;

    var queryFolder1 = 'title contains "' + folderName2 + '" and trashed = false and mimeType = "application/vnd.google-apps.folder"';
    var driveFolders = Drive.Files.list({
      q: queryFolder1,
      maxResults: 500,
      pageToken: pageToken,
      orderBy: 'title',
      field: 'parents:[id]',
      includeItemsFromAllDrives: true,
      supportsAllDrives: true
    });

    /* Create new sheet to save the output */
    var newSheet = SpreadsheetApp.create(folderName2);
    var newSheetID = newSheet.getId();
    var newSheet1 = newSheet.getSheetByName('Sheet1');
    newSheet1.getRange('A2:L2').setValues([['Parent URL', 'File Name', 'File ID', 'File URL', "MimeType: File Type", 'Owner', 'Creation Date', 'Last Modified Date', 'Last Modified User', 'Last Modified User Email Address', 'Shared DriveId', 'Sharing User EmailAddress']]);

    /* Gather data */
    var driveFolder = driveFolders.items;
    if (driveFolder) {
      for (var x = 0; x < driveFolder.length; x++) {
        var childFolder = driveFolder[x];

        rows.push([childFolder.parents[0].id, childFolder.title, childFolder.id, childFolder.alternateLink, childFolder.mimeType, childFolder.owners[0].emailAddress, childFolder.createdDate, childFolder.modifiedDate, childFolder.lastModifyingUserName, childFolder.lastModifyingUser.emailAddress, childFolder.driveId, childFolder.sharingUser.emailAddress]);
      }
      newSheet1.getRange(3, 1, rows.length, rows[0].length).setValues(rows);
}

Answer 1

您正在尝试访问不存在的属性。

childFolder.sharingUser.emailAddress 将抛出 TypeError，因为 childFolder.sharingUser 不存在。

您可以在尝试调用它之前检查它是否存在。例如：

考虑这部分代码，

if (driveFolder) {
    for (var x = 0; x < driveFolder.length; x++) {
      var childFolder = driveFolder[x];
      var sharingUser = getSharingUser(childFolder);
      rows.push([childFolder.parents[0].id, childFolder.title, childFolder.id, childFolder.alternateLink, childFolder.mimeType, childFolder.owners[0].emailAddress, childFolder.createdDate, childFolder.modifiedDate, childFolder.lastModifyingUserName, childFolder.lastModifyingUser.emailAddress, childFolder.driveId, sharingUser.emailAddress]);
    }
    newSheet1.getRange(3, 1, rows.length, rows[0].length).setValues(rows);
  }

getSharingUser 在哪里：

function getSharingUser(childFolder) {
  if (childFolder.sharingUser) {
    return childFolder.sharingUser
  } else return { emailAddress: "nobody" }
}

和childFolder.sharingUser.emailAddress 更改为sharingUser.emailAddress