@bencevans - Twitter - 2013/12/10

gistfile1.js

r.db("ScrobbleGraph").table("scrobbles").groupedMapReduce(
  function(doc) { return doc("date").date() },
  function(doc) { return [doc] },
  function(left, right) { return left.add(right)}
)


// It's better to use just an orderBy and group on the client because
// - The database won't have to keep everything in memory
// - It's faster because of the index
r.db("ScrobbleGraph").table("scrobbles").orderBy({index: "date"})