＆QUOT;未捕获类型错误：未定义不是一个函数＆QUOT;初始化骨干集合 [英] "Uncaught TypeError: undefined is not a function" initializing Backbone collection

问题描述

我有一个骨干集合类似以下内容：

I have a Backbone collection something like the following:

var FooCollection = Backbone.Collection.extend({
    model:Foo,

    initialize: function (attributes, options) {
        this.barId = options.barId;
    }
});

var Foo = Backbone.Model.extend({});

当我尝试初始化，我得到未捕获类型错误：未定义不是一个函数中的 _ prepareModel（） <$ C $的功能C> Backbone.Collection 。

When I try to initialize this, I get "Uncaught TypeError: undefined is not a function" in the _prepareModel() function of Backbone.Collection.

坏的通话中模式=新this.model（ATTRS，期权）。

// Prepare a model or hash of attributes to be added to this collection.
_prepareModel: function(model, options) {
  options || (options = {});
  if (!(model instanceof Model)) {
    var attrs = model;
    options.collection = this;
    model = new this.model(attrs, options); // <-- BLOWS UP HERE
    if (!model._validate(model.attributes, options)) model = false;
  } else if (!model.collection) {
    model.collection = this;
  }
  return model;
},

当我通过步骤_ prepareModel（）在调试器，它看起来像类型这个在这一点上是孩子和 this.model ，事实上，不确定的。

When I step through _prepareModel() in the debugger, it looks like the type of this at that point is child, and this.model is, in fact, undefined.

谁能告诉我什么，我做错了吗？

Can anyone tell me what I'm doing wrong?

推荐答案

在我的实际code 富在 FooCollection 。并没有意识到，JavaScript不支持前置声明。 [headdesk]

In my actual code Foo was declared after FooCollection. Didn't realize that Javascript doesn't support forward declarations. [headdesk]

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