HELP: Ember 2.8 -> Using oberver on property that has computed.alias of parentView property

[deverin]

Using property like this inside nested component to observe parent components property which is boolean

expandMenu: Ember.computed.alias 'parentView.expandMenu'

This esentially creates error

ember.debug.js:6778 Uncaught Error: Assertion Failed: You must use Ember.set() 
to set the `parentView` property (of <appname@component:simple-menu::ember690>) 
to `<appname@component:simple-menu-container::ember662>`.

simple-menu-container - is parent
simple-menu - is child -> expandMenu property is here

Came in with Ember 2.8, 2.7.3 works just fine

This issue
piceaTech/ember-rapid-forms/issues/134
resolves similar but different issues.

I am doing something wrong or something needs fixing?

You might think that this is the same error that was fixed in Ember 2.8.1, but please pay close attention. Fix was introduced here #14281

2.8.1 fixes problem with setting parentView to null

This error IS fixed with 2.8.1:

 Uncaught Error: Assertion Failed: You must use Ember.set() to set the `parentView` property (of 
 <myapp@component:em-input::ember619>) to `null`

This error IS NOT fixed with 2.8.1

Uncaught  Error: Assertion Failed: You must use Ember.set() to set  `parentView` 
property (of <appname@component:simple-menu::ember690>) to 
`<appname@component:simple-menu-container::ember662>`.

It wants me to set parentView property inside nested component to its parentComponent under which it is nested.

Problem starts when I am using an .observer('expandMenu') or any observer that observes property where parentView is involved

---

ember: 2.8.1

ember -v -verbose

ember-cli: 2.8.0
http_parser: 2.7.0
node: 6.6.0
v8: 5.1.281.83
uv: 1.9.1
zlib: 1.2.8
ares: 1.10.1-DEV
icu: 57.1
modules: 48
openssl: 1.0.2h
os: darwin x64

[rwjblue]

Can you please provide a reproduction twiddle or repo for this? I'm not sure where parentView is being set outside of the situation that is fixed in 2.8.1...

[Serabe]

Cannot reproduce this in 2.8.1 (twiddle), can you please provide a reproduction?

Thank you!

[deverin]

In progress, will post update

[deverin]

Here is a reproduction

twiddle

[deverin]

Is there any news?

[pixelhandler]

@dimul regarding parentView, see http://emberjs.com/api/classes/Ember.View.html#property_parentView this is a private property on a deprecated object. The component guides and api docs do not recommend using parentView. Perhaps there is another approach altogether.

[deverin]

Perhaps there is another approach altogether.

Any suggestions

[Serabe]

Passing a property from the parent component to the child component. You can explicitly yield the property or create contextual components for that. See this example with contextual components

[pixelhandler]

@dimul so far it appears this issue is more question or support related, I think you're get more feedback and help in the ember community slack, erhaps reach out in the http://embercommunity.slack.com #-help channel.

[workmanw]

I'm not sure I agree that this is a support issue. I think it's clearly usage of an intimate API that worked in one version of Ember and does not work in a more current version. While using an "Intimate API" can be controversial, I think you'll find more people with older apps who use parentView. There was certainly a simpler time where using parentView was an accepted solution to many problems. We certainly had cases where we were using parentView that was broken by this change.

In our case it was easy to move off of parentView and just pass the reference to the component instance as an attribute. But I do think it's sensible to at least acknowledge that this use to be supported and now for complicated technical reasons it is no longer practical to do so.