How to insert ahead an element to an embedded array?

Question

How to insert blow document

  {
      "author": "Vic Zhao",
      "text":  "hell..............."
  }

into blow document as first element of embedded array comments

{
   name: 'Me',
   comments: [{
      "author": "Joe S.",
      "text": "I'm Thirsty"
   },
  {
      "author": "Adder K.",
      "text":  "old content"
  }]
}

Answer 1

you can use the prepend operation http://www.rethinkdb.com/api/#js:document_manipulation-prepend

r.table(...).get(...).update({
    comments: r.row('comments').prepend(newEntry)
  }).run(conn, callback)

Where newEntry must be replaced by the data you want to insert.