控制器中的计算属性基于EmberJS中的路径模型

I want to implement computed property in controller that changes when data in route's model changed.

我想在控制器中实现计算属性，该属性在路由模型中的数据发生更改时发生更改。

Route:

路线：

import Ember from 'ember';

export default Ember.Route.extend({
    model() {
        return new Ember.RSVP.hash({
            ingredients: this.store.findAll('ingredient'),
            recipes: this.store.peekAll('recipe')
        });
    },

    setupController: function(controller, modelHash) {
        controller.setProperties(modelHash);
    }
});

Controller:

控制器：

import Ember from 'ember';

export default Ember.Controller.extend({
    pageNumber: 0,
    pageSize: 16,

    pages: function() {
        var pages = [];
        if (this.model != null) {
            var content = this.model.recipes;
            while (content.length > 0) {
                pages.push(content.splice(0, this.get("pageSize")));
            }
        }
        return pages;
    }.property('model.recipes.@each', 'pageSize'), 

    recipesOnPage: function() {
        return this.get('pages')[this.get('pageNumber')];
    }.property('pages', 'pageNumber')
});

This code produce no error, but doesn't work - "pages" always empty. And "pages" property doesn't recomputed on model changing. What am I doing wrong? And how to achieve desired result?

此代码不会产生错误，但不起作用 - “pages”始终为空。并且“页面”属性不会在模型更改时重新计算。我究竟做错了什么？以及如何达到预期的效果？

P.S. Ember version - 1.13.

附：灰烬版 - 1.13。

2 个解决方案

#1

Since you have modified setupController hook, your controller has properties ingredients and recipes, but has no model property.

由于您已修改了setupController挂钩，因此您的控制器具有属性成分和配方，但没有模型属性。

So your computed property should be:

所以你的计算属性应该是：

pages: function() {
 // avoid using model here
 // use this.get('recipes') instead of this.model.recipes
}.property('recipes.[]', 'pageSize')

SetupController hook guides link.

SetupController钩子引导链接。

#2

Please try:

请尝试：

import Ember from 'ember';

export default Ember.Controller.extend({
    pageNumber: 0,
    pageSize: 16,

    pages: function() {
        var pages = [];
        var model = this.get('model');
        if (model != null) {
            var content = model.get('recipes');
            while (content.length > 0) {
                pages.push(content.splice(0, this.get("pageSize")));
            }
        }
        return pages;
    }.property('model.recipes.@each', 'pageSize'), 

    recipesOnPage: function() {
        return this.get('pages')[this.get('pageNumber')];
    }.property('pages', 'pageNumber')
});

#1