How do I filter sub document (array) based on some predicate in Meteor publication?

Question

I am trying to filter not just the fields but objects inside my array field. Referring to the example below, for segments field, I want my client to only get those objects in the segments array where isReleased === true

Example Schema

{
    _id:      123456,
    segments: [
        {
            name: 'Type A',
            isReleased: false,
        },
        {
            name: 'Type B',
            isReleased: false,
        },
        {
            name: 'Type C',
            isReleased: true,
        }
    ],
}

So basically, I want my client to just receive,

{
    _id:      123456,
    segments: [
        {
            name: 'Type C',
            isReleased: true,
        }
    ],
}

Possible duplicate of [Retrieve only the queried element in an object array in MongoDB collection](http://stackoverflow.com/questions/3985214/retrieve-only-the-queried-element-in-an-object-array-in-mongodb-collection) — Tomasz Lenarcik, Oct 30 '16 at 20:24

score 0 · Answer 1 · answered Oct 29 '16 at 18:29

0

You could use the $elemMatch operator. The query would be like this:

Schema.find({segments: {$elemMatch: {isReleased: true}}},...)

You can check the examples on the link for more details.

answered Oct 29 '16 at 18:29

andresk

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How do I filter sub document (array) based on some predicate in Meteor publication?

1 Answers1