Update code to comply with Ember 2.8.0.

[josemariaruiz]

Check discussion in emberjs/ember.js#14266

[jacobq]

Thanks for the PR. I just rebased your commit and plan to merge if the tests are still passing.

[jacobq]

Looking at this a little more closely, I actually have some concerns:

• Does the alias alternative (computed + volatile) actually do the same thing? i.e. Will the property update when parentView.x changes?
• We are using alias similarly in a number of other places (e.g. md-card-reveal.js has activator: alias('parentView.activator')) that are not changed in this PR. Why not make them all consistent?
• If I understand correctly, the discussion you referenced appears to suggest that the root cause was actually a regression fixed by Fix release regressions. emberjs/ember.js#14281 and also that we might be doing something unsupported by trying to observe parentView (I'm hoping this is not the case but will have to check deprecations, warnings, functionality, etc. to know for sure -- I don't think there's currently test coverage for this).

[jacobq]

Thanks @grapho for helping me understand the problem better on the Ember community Slack chat. It sounds like .volatile() is really not what we're looking for here, but that we shouldn't be using parentView either.

you want to pass in attrs from parent views explicitly

I'll take a look to see if I can refactor things to eliminate use of parentView properties in components.

[mike-north-bot]

🎉 This PR is included in version 0.22.0 🎉

The release is available on:

• npm package (@latest dist-tag)
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