$populate does not need to be whitelisted

[bwgjoseph]

The docs (https://github.com/feathersjs-ecosystem/feathers-mongoose#populate) indicate that in order to use $populate, one would need to define $populate in the whitelist option when declaring a service..

app.use('/posts', mongoose({
  Model,
  whitelist: [ '$populate' ]
});

However, that does not seem to be the case.. To replicate..

mkdir feathers-populate
feathers g app
feathers g service | Post and Comment
leave everything as default except Post schema below

const schema = new Schema({
    text: { type: String, required: true },
    commentIds: [
      {
        type: Schema.Types.ObjectId,
        ref: 'comment',
      },
    ]
  }

Perform a REST call via localhost:3030/post?$populate[]=commentIds

This is without populate via REST call

{
    "total": 1,
    "limit": 10,
    "skip": 0,
    "data": [
        {
            "_id": "5f1d9420e8c36b5750baad43",
            "commentIds": [
                "5f1d93f4e8c36b5750baad41",
                "5f1d9400e8c36b5750baad42"
            ],
            "text": "post 1",
            "createdAt": "2020-07-26T14:33:04.752Z",
            "updatedAt": "2020-07-26T14:33:04.752Z",
            "__v": 0
        }
    ]
}

and this is with populate call

{
    "total": 1,
    "limit": 10,
    "skip": 0,
    "data": [
        {
            "_id": "5f1d9420e8c36b5750baad43",
            "commentIds": [
                {
                    "_id": "5f1d93f4e8c36b5750baad41",
                    "text": "comment 1",
                    "createdAt": "2020-07-26T14:32:20.751Z",
                    "updatedAt": "2020-07-26T14:32:20.751Z",
                    "__v": 0
                },
                {
                    "_id": "5f1d9400e8c36b5750baad42",
                    "text": "comment 2",
                    "createdAt": "2020-07-26T14:32:32.591Z",
                    "updatedAt": "2020-07-26T14:32:32.591Z",
                    "__v": 0
                }
            ],
            "text": "post 1",
            "createdAt": "2020-07-26T14:33:04.752Z",
            "updatedAt": "2020-07-26T14:33:04.752Z",
            "__v": 0
        }
    ]
}

Related to: feathersjs/feathers#1971

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