google-apps-script - 在创建命名文件夹之前检查它是否存在

Question

我试图将 Google Drive 中的特定文件插入到文件夹中。我还想检查是否有名称为 'testFolder' 的文件夹: 如果是，则将文件插入到已经存在的文件夹中，否则创建一个名为 'testFolder' 的文件.

到目前为止，这是我想出的，但它总是创建一个名为 'testFolder' 的新文件夹。 (所以用户现在有 10 个名为 'testFolder' 的文件夹 - 它不会重用第一个文件夹)。

var copyId = /* the id of the file to copy */;
function InsertFileToFolder() {
  var file = DriveApp.getFileById(copyId);      
  var folder;
  if (folderExists() == true){                        
    folder = DriveApp.getFolder("testFolder"); //<-- No such thing in GAS i think?
  } else {
    folder = DriveApp.createFolder("testFolder");
  }
  folder.addFile(file);
}

//Check whether folder exists or not
function folderExists() {
  var folders = DriveApp.getFolders();
  var flag = false;  
  for(var i = 0; i < folders.length; i++){
    if(folders[i].getName() == 'testFolder'){
      flag = true;
      break;
    }
  }
  return flag;
}

Answer 1

没有length folders 的属性(property).您需要使用 hasNext() .

Google Documentation - Folder Class

// Log the name of every folder in the user's Drive.
var folder,folders;

folders = DriveApp.getFolders();

while (folders.hasNext()) {
  folder = folders.next();
  Logger.log(folder.getName());
}

如果找到要查找的文件夹，此代码将返回文件夹 ID:

function InsertFileToFolder() {
  var file,folder,
      folderIdOrFalse;
  file = DriveApp.getFileById(copyId);      

  folderIdOrFalse = folderExists();

  if (folderIdOrFalse !== false) {                        
    folder = DriveApp.getFolderById(folderIdOrFalse);
  } else {
    folder = DriveApp.createFolder("testFolder");
  }

  folder.addFile(file);
};

function folderExists() { //Check whether folder exists or not

  var folders = DriveApp.getFolders();
  var theReturn = false,
      i=0,
      folderName = "",
      folder;  

  while (folders.hasNext()) {
    folder = folders.next();
    folderName = folder.getName();

    if (folderName === 'testFolder') {
      theReturn = folder.getId();
      break;
    };
  };

  return theReturn;
};