Mongoose don't save if object is null

Question

How not to insert empty object i.e { } in Mongoose schema.

Let suppose Mongoose collection is as follows

let testCollection = mongoose.Schema({
  someData:{
    type: []
  }

Insert in Mongoose collection is as follows

let emptyObj = { }

new testCollection({
 someData: emptyObj
}).save()

If this code executes, mongoose collection will be like this

 db.somecollection.find().pretty()

    {
     "someData" : [
       { }
      ]
    }

How to insert object in this array only if the object is not empty?

Estus Flask · Accepted Answer · 2019-02-28 12:02:07Z

2

If there are no other fields, this can be done with a ternary:

const isEmpty = !obj || Object.keys(obj).length;

new testCollection(isEmpty ? { someData: emptyObj } : {}).save()

Otherwise this can be done with object spread and short-circuit evaluation in order to avoid repetitions and additional temporary variables:

new testCollection({
  someField: 'value',
  ...(isEmpty || { someData: emptyObj })
}).save()

answered Feb 28, 2019 at 12:02

Estus Flask

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