Document references must have an even number of segments error on a collection reference

Question

I\'m getting the rather simple error:

Document references must have an even number of segments.

I\'m aware of what it is telling me and ho

Answer 1

Your userId variable probably has a slash in it. Document ids can't have slashes, since they are interepreted as dividers between collections and documents when forming the "path" to a document.

It's also possible that the string may be empty, which is invalid.