Backbone/RequireJS 嵌套列表中的循环依赖 [英] Circular Dependency in Backbone / RequireJS Nested List

问题描述

我正在使用 RequireJS 在 Backbone 中设置嵌套类别结构.

I'm setting up a nested categories structure in Backbone with RequireJS.

在这种结构中，一个类别集合包含类别模型，单个类别模型可以包含一个类别集合.

In this structure, a categories collection contains category models, and a single category model can contain a categories collection.

不幸的是，这似乎导致了 RequireJS 中可怕的循环依赖问题.我已阅读 RequireJS 上的文档(http://requirejs.org/docs/api.html#circular)但是我发现'a'和'b'的解释令人困惑.

Unfortunately this seems to cause the dreaded circular dependencies problem in RequireJS. I have read the docs on RequireJS (http://requirejs.org/docs/api.html#circular) however I am finding the explanation with 'a' and 'b' confusing.

这是我的代码，它导致了问题:

Here is my code, which is causing the problem:

define([

    "jquery",
    "underscore",
    "backbone",
    "collections/categories"

    ], function( $, _, Backbone, CategoriesCollection ) {

    var Category = Backbone.Model.extend({

        defaults: {
            title: "Untitled"
        },

        parse: function(data) {
            this.children = new CategoriesCollection( data.children, {parse: true} );
            return _.omit( data, "children" );
        }

    });

    return Category;

});

...

define([

    "jquery",
    "underscore",
    "backbone",
    "models/category"

    ], function( $, _, Backbone, CategoryModel ) {

    var Categories = Backbone.Collection.extend({
        model: CategoryModel
    });

    return Categories;

});

我想知道是否有人以前经历过这种情况，可以帮助我朝着正确的方向前进.

I am wondering if anyone who has experienced this before can help steer me in the right direction.

(提前)感谢您的帮助，

Thanks (in advance) for your help,

推荐答案

您只需要在模型中需要集合时再次使用 require 集合，因为最初传递的集合可以是未定义的:

You just need to use require the collection again when you need it in the model, as the Collection passing initially can be undefined:

define([

    "jquery",
    "underscore",
    "backbone",
    "collections/categories"

    ], function( $, _, Backbone, CategoriesCollection ) {

    var Category = Backbone.Model.extend({

        defaults: {
            title: "Untitled"
        },

        parse: function(data) { 
            if(!CategoriesCollection){
              CategoriesCollection = require("collections/categories");
            }

            this.children = new CategoriesCollection( data.children, {parse: true} );
            return _.omit( data, "children" );
        }

    });

    return Category;

});

在示例中，它们也导入 require 但它也应该在没有导入的情况下工作.

In the example they import also require but it should also work without the import.

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