How do I query Google Drive for id of a folder with known name in root folder (Google Drive SDK for iPhone)?

google-drive-api, ios, objective-c

Solution

I am selfish idiot!

GTLQueryDrive *queryFilesList = [GTLQueryDrive queryForChildrenListWithFolderId:@"root"];
queryFilesList.q = @"mimeType='application/vnd.google-apps.folder'";

works just fine, but it sees ONLY folders created with this app! That was my problem. To be exact you may use this query:

queryFilesList.q = @"mimeType='application/vnd.google-apps.folder' and 'root' in parents and trashed=false";

`trashed=false` is important if you don't want trashed items to be found.

Problem

With query `GTLQueryDrive *queryFilesList = [GTLQueryDrive queryForChildrenListWithFolderId:@"root"];` I get everything in root folder: files and folders. Sure, I can look for folder in `GTLDriveChildList` returned. But root folder can have thousands items, and I need only one of them. I tried narrow search. Comments in `GTLQueryDrive.h` say it's possible. I've tried `queryFilesList.q = @"mimeType='application/vnd.google-apps.folder'";` to query only folders or `queryFilesList.q = [NSString stringWithFormat:@"title='%@'", folderName];` to query all items by name. Both queries return empty lists. Double checked: folder I look for really exists. I've tried ``` GTLQueryDrive *queryFilesList = [GTLQueryDrive queryForFilesList]; ``` It works well with ``` queryFilesList.q = @"mimeType='audio/x-aiff'"; ``` But returns empty list if I try to query only folders with ``` queryFilesList.q = @"mimeType='application/vnd.google-apps.folder'"; ``` What am I doing wrong?

Original source