Handlebars Helpers Regressions

[realityendshere]

We use Handlebars helpers to determine if users should see certain parts of the UI. Unfortunately, creating custom if/else style block helpers has gotten more challenging with each Ember release since v1.9.1. I am seeing significant breaking changes and no documentation for updating Handlebars helpers to work with newer Ember releases.

Here are jsbins to illustrate how helpers are breaking:

Ember v1.9.1 (Works as expected)

http://jsbin.com/hocuro/1/

Ember v1.10.0 (Breaking change: inverse)

http://emberjs.jsbin.com/xoyulihize/1/

Ember v1.11.0 (White screen of doom)

http://emberjs.jsbin.com/xibire/2/

Ember v1.11.0 (Block helpers disabled)

http://emberjs.jsbin.com/xibire/1/

I've tried to find documentation regarding the evolution of Handlebars/HTMLBars. I understand there is adapter code to make Handlebars and HTMLBars play together and the context (what this is) in which helpers run has changed from controller to view to undefined.

In any case, I see this as a breaking change. Or at least an opportunity for someone to document how I should adjust my registered helpers to operate as expected in the newer Ember versions.

Thanks.

[pixelhandler]

+1 this breaks more than one app I've worked on, really don't want to be stuck on ember 1.9.1

[rwjblue]

Fixed by #10813.

Working JSBins:

http://jsbin.com/sigoqa/1/edit
http://jsbin.com/cewaha/1/edit

[rwjblue]

I wish someone had raised an issue in the 1.10 timeframe. At this point, I can likely get these fixes into 1.11.1 (which hopefully will release in a day or so), but I don't see an easy path to getting these fixes into 1.10.x because we have already branched 1.11 into stable.

[realityendshere]

@rwjblue Thanks for the fix. That was super fast!

[rwjblue]

@realityendshere - Thanks for reporting. This compat stuff is pretty important to us, I am sorry this fell through the cracks so long. 😞

[pixelhandler]

@rwjblue FYI our apps are back to the 'white screen of doom' again. Today we updated to 1.13; not sure yet if this will be a similar regression but with all the changes we can't run beta anymore at least not in the timeframe of the ember release cycles.

[rwjblue]

@pixelhandler - Sounds bad, please open issues when you track down the cause. We'll happily fix anything we can for bugs on the Ember side.