Ember.handlebars boundIf 没有调用计算属性

Question

我尝试将项目从 Ember cli 0.1.2 迁移到 0.1.15。当前问题是下一个：

我有帮手。它在较旧的 ember 上运行良好，但在较新的版本中，所有 can-blocks 都不存在。 Can-helper 在模型中使用计算的属性，所以我尝试将调试器设置为计算函数 - 它在 0.1.2 上工作，在 0.1.15

上不工作

原始 ember - 1.7.0-beta.1 尝试迁移到 ember - 1.9.1

我发现 boundIf 助手的实现已更改。有没有人对这种麻烦有一些想法/经验？

P.S。 can-helper 代码如下

var get = 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 is optional, if we've only got 2 arguments then the property contains our options
  if (!options) {
    options = property;
    property = null;
  }

  context = (options.contexts && options.contexts[0]) || this;

  attrs = {};

  // if we've got a property name, get its value and set it to the permission's content
  // this will set the passed in `post` to the content eg:
  // {{#can editPost post}} ... {{/can}}
  if (property) {
    attrs.content = getProp(context, property, options);
  }

  // if we've got any options, find their values eg:
  // {{#can createPost project=project user=App.currentUser}} ... {{/can}}
  for (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 the permission with the supplied attributes
  permission = this.get('container').lookup('permissions:main').get(permissionName, attrs);

  // ensure boundIf uses permission as context and not the view/controller
  // otherwise it looks for 'can' in the wrong place
  options.contexts = null;


  // bind it all together and kickoff the observers
  return Ember.Handlebars.helpers.boundIf.call(permission, "can", options);
}

在模板中用作

  {{#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}}

可以计算属性获得许可

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()

在旧版本中，我可以使用调试器语句在其中停止，但更新后 - 不能观察者更改模型可能会出错，但至少应调用一次（在初始渲染时）——据我所知

Answer 1

获取属性的上下文错误的原因请看这里https://github.com/emberjs/ember.js/issues/10692

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