Proper use of document Document#set with arrays

[Mark Sanford]

How do I set a value within a document, if it's nested within an array?   Setting properties using Document#set(path, value)  within nested objects works fine.   If there is a array in the path, not so much.  e.g.:

 var schema = new mongoose.Schema({
    name : {
      first : String,
      last  : String,
    },
    points : [ { x: Number, y: Number } ],
  });
  var Shape = mongoose.model( 'Shape', schema );
 
  var s = new Shape({
    name : {
      first : 'frank',
      last  : 'smith',
    },
    points : [
      { x : 1, y : 1 },
      { x : 2, y : 2 },
    ],
  });


  console.log( JSON.stringify( s, undefined, 2 ) );
  /*
  as expected:
    {
      "_id": "538f7cfb5fa6f8702350a78a",
      "points": [
        {
          "x": 1,
          "y": 1,
          "_id": "538f7cfb5fa6f8702350a78c"
        },
        {
          "x": 2,
          "y": 2,
          "_id": "538f7cfb5fa6f8702350a78b"
        }
      ],
      "name": {
        "first": "frank",
        "last": "smith"
      }
    }


  */
 
  s.set( 'points.1.y', 10 );
  s.set( 'name.first', 'James' );


  console.log( JSON.stringify( s, undefined, 2 ) );
  /*
    s.set completely clobbered s.points[1].  x and _id props are gone!


    {
      "_id": "538f7cfb5fa6f8702350a78a",
      "points": [
        {
          "x": 1,
          "y": 1,
          "_id": "538f7cfb5fa6f8702350a78c"
        },
        {
          "y": 10
        }
      ],
      "name": {
        "first": "James",
        "last": "smith"
      }
    }    
  */

[Jason Crawford]

I don't know why your set call isn't working as expected, but why not just do:

s.points[1].y = 10;

s.name.first = 'James';

That's why the schema exists, so you can write straightforward expressions like that.

Hope that helps,

Jason

--
Blog: http://blog.jasoncrawford.org  |  Twitter: @jasoncrawford

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[Mark Sanford]

Thanks for your reply.   

My use case involves storing a path within a document as a string and accessing the value through that path.   I created the example to demonstrate in the simplest way why document#set does not work as I was expecting.  

[William Riley-Land]

Sounds like it could be a bug.  You might consider adding an issue on the GitHub page.  

William Riley-Land
Founder & API Engineer
Kun.io App Studio LLC
http://kun.io/wprl
+1.573.823.2607

 

On Jun 4, 2014, at 3:45 PM, Mark Sanford <markts...@gmail.com> wrote:

Thanks for your reply.   

My use case involves storing a path within a document as a string and accessing the value through that path.   I created the example to demonstrate in the simplest way why document#set does not work as I was expecting.