Ability to specify fields to return by nested keys

[abovedave]

Currently, I'm unable to filter specific fields of a Reference object in a Web datasource.

E.g., The query would be fields={"title": 1, "author.name": 1}

{
  "datasource": {
    "key": "articles",
    "source": {
      "endpoint": "1.0/publisher/articles"
    },
    "paginate": 1,
    "count": 1,
    "fields": {
      "title": 1,
      "author.name": 1
    }
  }
}

This returns the title field, but a blank author array (author is a reference field)

{
  "results": [
    {
      "_composed": {
        "author": []
      },
      "_id": "5a946688dc5fc266552d2f25",
      "author": [],
      "title": "Why you should open source your website"
    },
    {
      "_composed": {
        "author": []
      },
      "_id": "5a9684827abb4273bcce608d",
      "author": [],
      "title": "Forming an orderly queue"
    }
}

[eduardoboucas]

Isn't this a duplicate of #329?

[jimlambie]

@eduardoboucas yes it is!

[eduardoboucas]

I'll close and fix. Then we'll all be happy. 👨‍👧‍👦