Updating item in array with unique ID

Question

I've got a document structure like this:

Content {
  _id: "mongoId"
  Title: "Test",
  Age: "5",
  Peers: [{uniquePeer: "1", Name: "Testy Test", lastModified: "Never"}, {uniquePeer: "2", Name: "Test Tester", lastModified: "Never"}]

}

So Peers is an array that has a unique identifier. How can I update the lastModified of one of the sets in the array? According to mongodb I can only update a document using the document's unique ID, but that's at the top level. How can I say update this lastModified field in this set of Peers with a uniquePeer of 1 in this document?

Edit:

Content.update({"_id" : "mongoId", "Peers.uniquePeer" : "1"},{$set : {"Peers.$.lastModified" : "Now"}})

I still get a "Not permitted. Untrusted code may only update documents by ID."

I've added an update with the what you say is a duplicate. I can't seem to get it to work for mine. — Joshua Terrill
– Joshua Terrill, Commented Aug 3, 2015 at 20:41
In my code, my uniquePeer isn't an integer, it's a guid that has letters and numbers so I have to put a quote around it. — Joshua Terrill
– Joshua Terrill, Commented Aug 3, 2015 at 20:45

David Weldon · Accepted Answer · 2015-08-03 21:15:24Z

4

See the docs for updating an array. Your code should look something like:

server

Meteor.methods({
  'content.update.lastModified': function(contentId, peerId) {
    check(contentId, String);
    check(peerId, String);

    var selector = {_id : id, 'Peers.uniquePeer': peerId};
    var modifier = {$set: {'Peers.$.lastModified': 'Now'}};
    Content.update(selector, modifier);
  }
})

client

Meteor.call('content.update.lastModified', contentId, peerId);

Note that this kind of operation needs to take place in a server-defined method because, as you found out, you can only update docs by id on the client.

answered Aug 3, 2015 at 21:15

David Weldon

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3 Comments

Michel Floyd Over a year ago

Does the string 'Now' magically get transformed by mongo to new Date()?

David Weldon Over a year ago

That would be cool, but no, I was just following his example.

Michel Floyd Over a year ago

That was my initial thought - "Did mongo just introduce a new trick?" So Joshua, you probably want new Date() there.

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