ember.js - Ember.handlebars boundIf didn't call calculated property -

i try migrate project form ember cli 0.1.2 0.1.15. current problem next:

i have can-helper. works fine @ older ember @ newer version can-blocks absent. can-helper use calculated property in model, try set debugger calculation function - work on 0.1.2 , didn't work @ 0.1.15

original ember - 1.7.0-beta.1 try migrate ember - 1.9.1

as found implementation of boundif helper changed. have ideas / experience such trouble?

p.s. code of can-helper below

var = ember.get, isglobalpath = ember.isglobalpath, normalizepath = ember.handlebars.normalizepath,   is_binding = ember.is_binding;  var getprop = function(context, property, options) {   if (isglobalpath(property)) {     return get(property);   } else {     var path = normalizepath(context, property, options.data);     return get(path.root, path.path);   } };  export default function(permissionname, property, options) {   var attrs, context, key, path, permission;    // property optional, if we've got 2 arguments property contains our options   if (!options) {     options = property;     property = null;   }    context = (options.contexts && options.contexts[0]) || this;    attrs = {};    // if we've got property name, value , set permission's content   // set passed in `post` content eg:   // {{#can editpost post}} ... {{/can}}   if (property) {     attrs.content = getprop(context, property, options);   }    // if we've got options, find values eg:   // {{#can createpost project=project user=app.currentuser}} ... {{/can}}   (key in options.hash) {     if (!options.hash.hasownproperty(key)) {       continue;     }     path = options.hash[key];     if (options.hashtypes[key] === 'string') {       if (is_binding.test(key)) {         attrs[key.slice(0, -7)] = getprop(context, path, options);       }       else {         attrs[key] = path;       }     }     else {       attrs[key] = getprop(context, path, options);     }   }    // find & create permission supplied attributes   permission = this.get('container').lookup('permissions:main').get(permissionname, attrs);    // ensure boundif uses permission context , not view/controller   // otherwise looks 'can' in wrong place   options.contexts = null;     // bind , kickoff observers   return ember.handlebars.helpers.boundif.call(permission, "can", options); } 

in template used as

  {{#can read model="contact"}}     <div class="panel">       {{#link-to 'contacts' id="nav-to-contacts" class="main-menu-root-item" title="contacts"}}         contacts       {{/link-to}}     </div>   {{/can}} 

can computed property @ permission

can: function() {   var model = get(this, 'model'),     field = get(this, 'field'),     permission = rules.findby('name', model);     return permission && permission.read &&          (field ? permission.read.contains(field) : permission.read.length); }.property() 

at older version can stop inside debugger statement, after updating - can't it's possible errors on observers changes of model, should called @ least once ( on initial rendering ) - understand

the reason in wrong context getting property please here https://github.com/emberjs/ember.js/issues/10692