Children of a OneDrive DriveItem by RelativePath does not work

When I call below url from graph exlorer:

https://graph.microsoft.com/v1.0/me/drive/root:/folder2/children

I get below error:

"error": {
        "code": "itemNotFound",
        "message": "The resource could not be found.",

But when I call same url without the /children :

https://graph.microsoft.com/v1.0/me/drive/root:/folder2

Then it works and returns the information for folder2. Folder2 is under root directly and contains files and other folders.

Is this an issue in the graph api or is it something I am doing wrong? This is in OneDrive for Business.

Solution

The :{path}: tells the API that you want to address an item by its path rather than it's ID. In your URI, you're missing the closing : which leaves the API attempting to find the path /folder2/children rather than the path /folder2 and the API action /children.

Breaking this down to its components:

API Address: https://graph.microsoft.com
API Version: /v1.0
Drive: /me/drive/root
DriveItem Path: :/folder2:
Request Action: /children

Put together, your URI should look like this:

https://graph.microsoft.com/v1.0/me/drive/root:/folder2:/children

Also note that if folder2 contained a sub-folder named folder3, you can address that by path as well:

https://graph.microsoft.com/v1.0/me/drive/root:/folder2/folder3:/children