ember.js - How can I send a message / call a method on all itemController children instances in Ember? -

i'm trying use "buffered proxy" pattern on collection of items in form hasmany model. when complete, i'm trying have "save" button, triggers save action, allow me save as-yet unsaved changes i've made. more info on bp in ember:

http://coryforsyth.com/2013/06/27/ember-buffered-proxy-and-method-missing/

i can work fine top level model attribute, i'm confused how tell non-singleton itemcontrollers want them save buffers, able call grandparent save whole enchilada. hoping i'd able parent array controller:

actions: {      savestuff: function() {          // possible?         this.get('allthenonsingletonitemcontrollerchildren').send('savethosebuffers');       }  } 

child controller:

savethosebuffers: function() {      var grandparent = this.get('parentcontroller').get('parentcontroller');      this.applybufferedchanges();     grandparent.saveentirerecord(); // not sure how work yet - can't use 'needs' because none of these controllers singletons.  } 

grandparent:

saveentirerecord: function() {      this.get('model').save().then(function() {          //other stuff;     }  } 

view like:

{{#each stuff in childitems itemcontroller="childcontroller"}}      {{input type="text" value=stuff.name}}  {{/each}}  <button {{action 'savestuff'}}>save</button> 

nothing in docs or has revealed incantations this.

update:

based on suggestion, tried:

children = this.get('content');  children.foreach(function(child) {      child.send('savethosebuffers');  }); 

but received:

"uncaught error: attempted handle event savethosebuffers on while in state root.loaded.saved."

update 2:

versions:

debug: ember      : 1.5.0-beta.2 ember.js:3496 debug: ember data : 1.0.0-beta.7+canary.b45e23ba ember.js:3496 debug: handlebars : 1.3.0 ember.js:3496 debug: jquery     : 1.9.1 ember.js:3496 

update 3:

tried getting access subcontrollers using:

var children = this.get('_subcontrollers'); 

that returns empty array, regardless of itemcontroller set (in arraycontroller or in each loops using itemcontroller=)

update 4:

i've created jsfiddle shows i'm attempting possible using _subcontrollers:

http://jsfiddle.net/spa9q/5/

however, works doing setup in route using setupcontroller, don't see how can use in application (the controller in question cannot named same model, it's 1 'mode' of viewing/editing model using {{render}} , uses async hasmany relationship.)

none of above methods worked (hopefully buffered proxy fleshed out , officially support/integrated ember someday soon, not saving nested models until buttons pushed common use case) wound following in parent controller, job:

childmodels = this.get('child.content.content');  childmodels.foreach(function(child) {      child.rollback(); // or .save()  });