MongoDB - Updating array inside an object

Question

I've this simple json:

{
   id: 1,
   basket: {
        box: []
   }
}

I need to add itens inside the box array that's child of the basket array.

My attempt:

updateOne({ id: 1},  {
                "$push": {
                    "basket": {
                        "box": {
                            "dummy": "test"
                        }
                    }
                }
            }

but it's not working. I am receiving this exception:

UnhandledPromiseRejectionWarning: MongoError: The field 'basket' must be an array but is of type object in document

Jeremy M. · Accepted Answer · 2018-02-28 14:01:32Z

2

You can access your object like so :

findOne({ id: 1}, 
{
  "$push": {
      "basket.box": {
        "dummy": "test"
      }
  }
}

edited Feb 28, 2018 at 14:01

answered Feb 28, 2018 at 13:53

Jeremy M.

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4 Comments

Jay Blanchard Over a year ago

Do or do not, there is no "try". A good answer will always have an explanation of what was done and why it was done in such a manner, not only for the OP but for future visitors to SO. While this code may answer the question, providing additional context regarding why and/or how this code answers the question improves its long-term value.

Marco Jr Over a year ago

No lucky...now I got a UnhandledPromiseRejectionWarning: MongoError: The field 'basket.bopx' must be an array but is of type object in document

Jeremy M. Over a year ago

Can you place your schema in your question please ?

Devesh Over a year ago

@MarcoJr Please check if the error you are getting because you have tried wrong way in your own solution that made the basket.box as object. Please delete the exiting records and try again, It should work.

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