How to do update the matched array element

Question

user1 in database

{
    counts: [{code:"aaa", num:100}, {code:"bbb", num:200}]
}

counts is an Array, it has two elements code and num.

How to let num increase 1 if code = "aaa"?

Meteor.users.update(user1._id, {$inc: {???}}); // How to write this?

Thanks

As a note for meteor. Performing updates from the client (browser) without the main `_id` is considered insecure. As long as you include the `_id` as well as the element to to match in the query `{ "_id": user1._id, "counts.code": "aaa" }` then all should be fine. Anything else implies a multiple document update and is insecure, therefore should be defined as a server side method to be invoked. But the basic answer is include the element to match in the query portion of the update and reference with the positional `$` operator `{ "$inc": { "counts.$.num": 1 }}`.in the update portion. — Blakes Seven, Feb 26 '16 at 22:32

score 0 · Answer 1 · answered Feb 26 '16 at 22:47

0

Gotta positionally match. Example:

Players.update({
  _id: Meteor.userId(),
  'games._id': Session.get('gameId')
}, {
  $inc: { 'games.$.score': 1 }
});

answered Feb 26 '16 at 22:47

corvid

1 Answers1