我在哪里计算烬.js我的风格字符串

我有一个ember.js应用

var App = Ember.Application.create({
  LOG_TRANSITIONS: true
});
App.ApplicationAdapter = DS.FixtureAdapter;
//==============================ROUTER==============================
App.Router.map(function() {
  this.resource('organisation', {path: '/:org_slug/:org_id'}, function () {
    this.resource('building', {path: '/:hall_slug/:hall_id'});
    this.resource('group', {path: '/:grp_slug/:grp_id'});
  });
});

我不知道如何从我复杂的夹具数据中整齐地计算东西。我的模型包括一个有建筑物和建筑组的组织。

//==============================MODELS==============================
App.Organisation = DS.Model.extend({
  name: DS.attr('string'),
  buildings: DS.hasMany('building', {async: true}),
  groups: DS.hasMany('group', {async: true})
});
App.Building = DS.Model.extend({
  organisation: DS.belongsTo('organisation'),
  name: DS.attr('string'),
  value: DS.attr('number'),
  groups: DS.hasMany('group', {async: true})
});
App.Group = DS.Model.extend({
  organisation: DS.belongsTo('organisation'),
  buildings: DS.hasMany('building', {async: true}),
  name: DS.attr('string'),
  start: DS.attr('date'),
  end: DS.attr('date'),
  main: DS.attr('boolean'),
  value_range: function() {
    var maximum = 0.0;
    var minimum = 0.0;
    this.get('buildings').forEach(function(building) {
      var v = building.get('value');
      maximum = Math.max(maximum, v);
      minimum = Math.min(minimum, v);
    });
    return {'maximum': maximum, 'minimum': minimum};
  }.property('buildings.@each.value')
});

我需要计算的东西基于整个建筑组在value_range函数。

我有这些固定装置

//==============================FIXTURES==============================
App.Organisation.FIXTURES = [
  { id: 1, name: 'Organisation 1', buildings: [1,2,3,4,5,6,7,8,9,10], groups: [1, 2, 4]},
  { id: 2, name: 'Organisation 2', buildings: [11,12,13,14,15,16], groups: [3]}
];

App.Building.FIXTURES = [
  { id: 1, name: 'Building 1', value: -3.2, groups: [1], organisation_id: 1},
  { id: 2, name: 'Building 2', value: 23.2, groups: [1,2], organisation_id: 1},
  { id: 3, name: 'Building 3', value: 34.2, groups: [1,2], organisation_id: 1},
  { id: 4, name: 'Building 4', value: -3.12, groups: [2], organisation_id: 1},
  { id: 5, name: 'Building 5', value: 0.12, groups: [3], organisation_id: 2},
  { id: 6, name: 'Building 6', value: 0.2, groups: [3], organisation_id: 2}
];

App.Group.FIXTURES = [
  {id: 1, organisation_id: 1, name: 'Group 1', buildings: [1,2,3], main: true},
  {id: 2, organisation_id: 1, name: 'Group 2', buildings: [2,3,4], main: false},
  {id: 3, organisation_id: 2, name: 'Group 3', buildings: [5,6], main: true},
];

我已经成功地为一个组织创建了一个路由和一个索引路由，它应该显示默认('main')组。

//==============================ROUTES==============================
App.OrganisationRoute = Ember.Route.extend({
  model: function(params) {
    return this.store.find('organisation', params.org_id);
  },
  serialize: function(model) {//add prefix to slug and id
    return {
      org_slug: model.get('slug'),
      org_id: model.get('id')
    };
  }
});
App.OrganisationIndexRoute = Ember.Route.extend({
  model: function(params) {
    //get buildings from the main group
    return this.modelFor('organisation').get('groups').then(function(grps) {
      return grps.findBy('main', true).get('buildings');
    });
  },
  setupController: function(controller, model) {
    this._super(controller, model);
    controller.set('organisation', this.modelFor('organisation'));
    var mygroup = this.modelFor('organisation').get('groups').then(function(grps) {
      controller.set('group', grps.findBy('main', true));    
    });
  }
});

我想呈现一个简单的栏样式与计算值在组中的每个建筑(左/右和宽度值)。计算中使用group.value_range数据和building.value数据。我的问题是我不知道把这个函数放在哪里。控制器似乎无法进入单个建筑。

我是否使用车把帮助器?我把它拼凑在一起，但它有味道。

Ember.Handlebars.helper('thing', function(building, group) {
  var range = group.get('value_range');
  var value = building.get('value');
  var width = Math.abs(value)/(range.maximum - range.minimum) * 100;
  var zero_position = Math.abs(range.minimum)/(range.maximum - range.minimum) * 100;
  if (value >= 0) {
    left_or_right = 'left';
    myclass = 'pos';
  } else {
    left_or_right = 'right';
    myclass = 'neg';
    zero_position = 100 - zero_position;
  }
  return new Handlebars.SafeString(
    '<div class="my-bar ' + myclass + '" style="width: ' + width + '%; ' + left_or_right + ': ' + zero_position + '%;">-</div>'
  );
});

还是我需要一个视图?文档说视图主要用于事件处理。

我不太明白这是怎么回事。有人能帮忙吗?