Ember Data, JSONAPI, and known-to-be-empty relationships that are definitely not empty

@mattmcmanus wrote:

So I’ve got an app that throws this warning ALL THE TIME:

vendor.js:17426 WARNING: You pushed a record of type 'app-page-person' with 
a relationship 'page' configured as 'async: false'. You've included a link but no 
primary data, this may be an error in your payload. EmberData will treat this 
relationship as known-to-be-empty.

Here is my scenario and my expectation:

1. My app is viewing a particular page. The page is in the store and loaded.
2. On the page, I do a fetch to my JSONAPI endpoint to grab app-page-person records <url>/app-page-people?filter%5Bpage-id%5D=5344a64b-1394-4885-8f2b-ddd6e927025a&include=person.image
   • Note: I’m not using the built in ember-data fetching. All relationships are set to async: false and I’m doing the query on my own through store.query
3. The resulting payload is pushed into the store. It includes the linkage data for the page without the full model, because I already have it

    ....
    {
      "id": "00fafeee-6c9d-4bd2-9108-eb5a7c11ca57",
      "type": "app-page-people",
      "links": {
        "self": "https://www...."
      },
      "attributes": { "sort-order": 34 },
      "relationships": {
        "page": {
          "links": {
            "self": "https://www.....",
            "related": "https://www....."
          },
          "data": {
            "type": "pages",
            "id": "5344a64b-1394-4885-8f2b-ddd6e927025a"
          }
        },
        "person": {
          "links": {
            "self": "https://www.....",
            "related": "https://www...."
          },
          "data": {
            "type": "people",
            "id": "00fafeee-6c9d-4bd2-9108-eb5a7c11ca57"
          }
        }
      }
    },
   ....

4. I receive the above warning

My assumption

My expectation here is that since the page model is already in the store, things should be fine. I don’t understand why ember-data feels the need to warn every time.

Some more details

Page Model

export default DS.Model.extend({
  ...
  appPageProfiles: DS.hasMany('app-page-profile', { async: false, inverse: 'page' }),
  ...
})

AppPagePerson Model

export default DS.Model.extend({
  ...
  page: DS.belongsTo('page', { async: false }),
  ...
})

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