Meteor React publish merged collections

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With Meteor (1.4.2.3) and React, I have the collection Objects which has an itemId which refers to the collection Items.

Currently I subscribe to the collection on the client side with:

export default createContainer(() => {
  var objects = Objects.find({}, {
      transform: function (doc) {
        doc.item = Items.findOne({
          _id: doc.itemId
        });
        return doc;
      }
    }).fetch();
  return {
    objects: objects,
  }
}, App);

This works perfect, but I think it is more elegant to merge the collections on the server side. However, none of the solutions I found seem to work

Transform at collection definition

const Objects = new Mongo.Collection('objects',
  {
    transform: function (doc) {
      doc.item = Items.findOne({
        _id: doc.itemId
      })
    }
  });

The console gives:

Error: transform must return object

Transform at publish

if (Meteor.isServer) {
  Meteor.publish('allObjects', function () {
    return Objects.find({}, {
      sort: { startedAt: -1 },
      transform: function (doc) {
        doc.item = Items.findOne({
          _id: doc.itemId
        });
        return doc;
      }
    });
  });
};

TypeError: Cannot read property 'name' of undefined

Where name is a property of Items

asked 44 secs ago

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Meteor React publish merged collections