CODEWITHSUNDEEP
angularmongodbmongoose
hemant
hemant

Reputation: 459

how to use $objectToArray in mongoose or equivalent in Angular

I need to convert a mongo document in Angular, into an array of key value pairs like shown below. e.g. when a client document is recd, the whole document needs to be converted into an array as shown below.

There is an aggregation option in MongoDb - $objectToArray

{ $objectToArray: { item: "foo", qty: 25 } }

result:

[
   {
      "k" : "item",
      "v" : "foo"
   },
   {
      "k" : "qty",
      "v" : 25
   }
]

  1. I could not find this in Mongoose documentation? Is it available?

  2. Is there a way to achieve this in Angular when the document is received from Node API?

Upvotes: 0

Views: 1506

Answers (1)

HandsomeCoder
HandsomeCoder

Reputation: 756

Yes, you can use $objectToArray in the aggregation pipeline and it will also work in mongoose, you try a query like this

Model.
  aggregate([{
        $project: { sampleField: { $objectToArray: "$array" } }
  }]).exec();

In case, if you want to convert the whole document into an array you can try this pipeline

db.collection.aggregate([
  {
    "$match": {
      _id: 1
    }
  },
  {
    // Add this stage in
    //case you want to exclude some keys
    "$project": {
      _id: 0
    }
  },
  {
    $project: {
      data: {
        $objectToArray: "$$ROOT"
      }
    }
  }
])

Here is a link to test the query in the playground: Mongo Playground

OR

If you want to do it in Angular then you can try this code

let object = { item: "foo", qty: 25 }

let result = Object.entries(object)
                   .map(itr => {
                      return {k: itr[0], v: itr[1]}
                    })

console.log(result)

Upvotes: 1

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