Setting default value for nested object in array in mongoose schema

Question

I want to achieve an element in schema like that:

array: [
    {id: 0},
    {id: 1},
    {id: 2}
]

In othr words, I want to declare an array that will hold 3 objects and those 3 objects should already have ids set. I had several attempts, but the objects never showed up

Akrion · Accepted Answer · 2019-05-23 16:51:25Z

3

There is not a lot of detail to your question so I am not sure what those ids are/should be but you could do this in your schema:

var YourSchema = new Schema({
  foo: {
    type: [{}],
    default: [{id: 1}, {id:2}, {id:3}]
  }
}

That would on record creation setup that array with those objects inside.

The result would be:

{
  "_id" : ObjectId("SOMEID"),
  "foo" : [ 
      {
          "id" : 1
      }, 
      {
          "id" : 2
      }, 
      {
          "id" : 3
      }
  ],
}

answered May 23, 2019 at 16:51

Akrion

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