ember.js - difference between emberjs model's _data and _attribute? -

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i using model app.license has property called expires_at.

while editing license, in edit method of licensecontroller, setting it's expiry :

this.get('model').set('expires_at', '2014-12-31');

then doing this.get('model').save(); make put request server. in request, expires_at parameter send old value of model.

when printed model in console, showed me expires_at in both _attributes , _data. strange thing expires_at in _attributes updated one, , 1 in _data old 1 (which sent put request). other properties of license getting set , sent put parameters except expires_at. missing out on small important thing? on appreciated.


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