How do I load a random document from CouchDB (efficiently and fairly)?

Question

I would like to load a random document out of a set of documents stored in a CouchDB database. The method for picking and loading the document should conform to the following re

Answer 1

How about "abusing" a view's reduce function?

function (keys, values, reduce) {
    if (reduce)
      return values[Math.floor(Math.random()*values.length)];
    else
      return values;
}