weird file listing response differences between v2 and v3

Question

I am using the google-drive-sdk with our company-made device. We upload pictures made by our device to google drive. After that I try to list the files with a GET request to https://www.googleapis.com/drive/v2/files to get thumbnailLink and webContentLink. Everything is working fine except that when I switch to v3 I don't get the response I should. The documentation says I should get a metadata response like https://developers.google.com/drive/v3/reference/files but I only get: id, kind, name and mimeType. What am I doing wrong?

Answer 1

As stated in Migrate to Google Drive API v3 documentation, there are changes on how fields were returned.

Full resources are no longer returned by default. You need to use the fields query parameter to request specific fields to be returned. If left unspecified only a subset of commonly used fields are returned.

You can see examples on Github. This SO question might also help.

Answer 2

In v3 they made all the queries parametric. So you can query passing some parameter like

var request = gapi.client.drive.files.list({
                'pageSize': 10,
                'fields': 'files,kind,nextPageToken'
            });

This block of code will return you all the information of every file just like v2.

If you are sending a get request then for fetching all the information you can try GET https://www.googleapis.com/drive/v3/files?fields=files%2Ckind%2CnextPageToken&key={YOUR_API_KEY}

Suppose you need ownsers and permissions only then set

var request = gapi.client.drive.files.list({
                    'pageSize': 10,
                    'fields':'files(owners,permissions),kind,nextPageToken'
                });

For GET request use GET https://www.googleapis.com/drive/v3/files?fields=files(owners%2Cpermissions)%2Ckind%2CnextPageToken&key={YOUR_API_KEY}

for reference you can use Google Developers Documentation for fetching File list