How to migrate modify a collections of object array in mongodb?-CodePudding

I have the following schema mongoose, but have a app in production with collections. This is a simplification of a much larger problem, reduced for better understanding.

This is only a sample basic.

export const ListSchema = new Schema({
  listaItemsIds: [
    {
        type: Schema.Types.ObjectId,
        ref: 'Items',
        default: [],
    },
  ],
});

I need to migrate all the data to the following model.

export const ListSchema = new Schema({
  listaItemsIds: [
    {
      item: {
        type: Schema.Types.ObjectId,
        ref: 'Items',
        default: [],
      },
      property1: {
        type: Number,
        required: false,
        default: 0,
      },
      property2: {
        type: Number,
        required: false,
        default: 0,
      },
    },
  ],
});

The following document

{
        "_id" : ObjectId("62bade11ff94fb9e5a0f5236"),
        "listaItemsIds" : [
                ObjectId("62a118a9167d269d38a4c806"),
                ObjectId("62baef0cff94fb9e5a0f53e3"),
                ObjectId("627bb4d61119d5ce2201b7df")
        ],
        "__v" : 37
}

it is necessary to transform

{
        "_id" : ObjectId("62bade11ff94fb9e5a0f5236"),
        "listaItemsIds" : [
                {
                    item:ObjectId("62a118a9167d269d38a4c806"),
                    property1:55,
                    property2:75,
                },
                {
                    item:ObjectId("62baef0cff94fb9e5a0f53e3"),
                    property1:55,
                    property2:75,
                },
                {
                    item:ObjectId("627bb4d61119d5ce2201b7df"),
                    property1:55,
                    property2:75,
                },              
        ],
        "__v" : 37
}

I have tried the following code snippet with no results.

db.ListSchemas.updateMany({},
    [
    {$set: {"listaItemsIds.$[elem]":
    {
      item:"listaItemsIds.$[elem]",
      property1:0,
      property2:0,
    }}}
    ]
    );

Surely someone with more experience can help me.

CodePudding user response：

Maybe something like this:

db.collection.update({},
[
{
$addFields: {
  listaItemsIds: {
    $map: {
      input: "$listaItemsIds",
      as: "id",
      in: {
          item: "$$id",
          property1: 55,
          property2: 75
         }
       }
     }
   }
 }
],
{
  multi: true
})

Explained:

Replace the array using $map to create the necessary objects.

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