isSaving stays true after 422 response

[mxrguspxrt]

For me it not expected behaviour - I would like to use isError or isDirty, because save action had return from server.

[igorT]

Could you write a failing test please?

[wecc]

I did a bit of research on this and it seems like this line causes Uncaught TypeError: Cannot assign to read only property '__reason_with_error_thrown__' of OK in Chrome and TypeError: Attempted to assign to readonly property. in Safari.

It's easily reproduceable on Chrome 39.0.2171.95 even without Ember Data (just mimicking RESTAdapter.ajaxError()), see this JSBin.

Might be caused by https://bugs.webkit.org/show_bug.cgi?id=49739

ping @stefanpenner

[wecc]

@mxrguspxrt would you be able to test using Ember canary? emberjs/ember.js#10215 from @bmac should most likely solve this.

[wecc]

Sorry, the PR above won't fix this but #2697 most likely will, my bad :)

[wecc]

@mxrguspxrt #2697 has been merged, could this be closed?