How to display server errors in templates using RESTAdapter?

@hashbug wrote:

While trying to handle server side errors in Ember application, I am unable to show the errors in templates. On record.save action the API returns errors as:

{    
   "errors":[  
      {  
         "detail":"can't be blank",
         "source":{  
            "pointer": "/data/attributes/username"
         } }
      ]
}

In template file, the code for showing errors for username attribute is:

 {{input type="text" value=username }}  
    {{#each model.errors.username as |error|}}  
         {{error.message}}  
    {{/each}}  
    {{input type="text" value=email }}  
  `  <button {{action 'register'}}>Register</button>`

the action "register" tries saving the user as:

register: function(){  
    var username = this.controller.get('username');  
    var email = this.controller.get('email');  
    var user = this.store.createRecord('user',{  
            email: email,  
            username: username  
        });  
    user.save().then(function(){  
        //handle success  
     },function(error){  
       console.log(user.get('errors.username')); 
     });  
 });

In console I got the array[object] for errors.username where object contains the desired attribute and message, But in template I am not able to access these messages.
I have posted this question on stackoverflow as well. http://stackoverflow.com/questions/40081844/server-side-errors-not-populated-in-ember-model-with-restadapter

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