Model A is load from the server. Model B is manually pushed using store.pushPayload.
If Model B is loaded before Model A, everything is fine and {{a.b.name}} works correctly inside the template. But when Model A is loaded before Model B, then the name is empty (the whole relation is not set actually).
I don’t think a.set('b', b) should be necessary here because the relationship between a and b is specified in the definition of each a model.
I made a jsbin to explain better what I want to achieve. After 5sec, all B models are load and I would expect that the relation between A and B appears on the screen.
And you know what? It works but only inside the editor of jsbin (/edit at the end).
Under this url JS Bin - Collaborative JavaScript Debugging, within my App or locally on my computer (served with web server) Ember still fails to solve relationships.