Looping in Firebase [Swift]

I have been trying to find a way to print/isolate each of the children in a part of the JSON data structure in Firebase. I am using swift and another post mentioned and verified this as the solution: for child in snapshot.childSnapshotForPath("vets").children { print(child.key); } but this is not valid because it comes with this warning: Ambiguous use of 'key' how do you recommend I loop through the data? All help is greatly appreciated!