在骨干模型保存都没法'得到' [英] No method 'get' on backbone model save
问题描述
我使用的骨干一个相当复杂的形式。我有一些嵌套模型，并在像这样父模型已经计算其他变量：
// INSIDE父模型computedValue：功能（）{
。VAR值= this.get（'childModel'）得到（'childModelProperty'）;
返回值;
}
这似乎很好地工作保持我的用户界面同步，但只要我称之为
.save（）
这是父模型，我得到：
未捕获类型错误：对象＃＆LT;对象＆gt;没有方法'得到'
似乎子模型那种暂时停止响应。
我做得不对本质？
编辑：堆栈跟踪是：
未捕获类型错误：对象＃＆LT;对象＆gt;没有方法'得到'publish.js：90
Backbone.Model.extend.neutralDivisionComputer publish.js：90
Backbone.Model.extend.setNeutralComputed publish.js：39
Backbone.Events.trigger Backbone.js的：163
_.extend.change Backbone.js的：473
_.extend.set Backbone.js的：314
_.extend.save.options.success Backbone.js的：385
f.Callbacks.o jquery.min.js：2
f.Callbacks.p.fireWith jquery.min.js：2
W¯¯jquery.min.js：4
f.support.ajax.f.ajaxTransport.send.d
编辑＃2响应如下评论：
有一些基本的我还是没有得到。我换过几个引用this.get（'childModel'）['childModelProperty']现在我得到的东西像
不能读的未定义的属性childModelProperty。
我还没有从服务器上拉什么，父模型只是创建像
定义（['jQuery的'，'底线'，'骨干'，'模型/ childmodel']，功能（$，_，骨干，ChildModel）{
VAR ParentModel = Backbone.Model.extend（{
默认值：{
childModel：新ChildModel（）
}
默认在创建模型时使用。保存被称为后，它会调用设置这将覆盖childModel用一个简单的JavaScript对象。在我看来，你有两个选择：
1）使用 Backbone.Relational
2）重写中的每个父模型更新现有的子模型（或创建一个）像下面这样设置：
儿童：{
childModel：ChildModel
}
设置：功能（键，值，选项）{
VAR ATTRS;
如果（_.isObject（密钥）||键== NULL）{
ATTRS =键;
选项=价值;
}其他{
的attrs = {};
ATTRS [关键] =价值;
} _.each（this.children，功能（childType，名）{
如果（！attrs.hasOwnProperty（名））
返回; //假设孩子只是一个模型 - 不是一个集合
VAR为newValue = ATTRS [名]
删除ATTRS [名]
VAR isModel =本[名]放大器;＆安培;这个[名] .SET;
如果（isModel＆安培;＆安培;为newValue）{
这个[名] .SET（为newValue，期权）;
}
否则，如果（newValue）以{
这是[NAME] =新childType（为newValue）;
}
其他{
删除[名]
} this.trigger（'的变化：'+名）; }， 这个）; 返回Backbone.Model.prototype.set.call（这一点，ATTRS，期权）; }
I'm using backbone for a reasonably complicated form. I have a number of nested models, and have been computing other variables in the parent model like so:
// INSIDE PARENT MODEL
computedValue: function () {
var value = this.get('childModel').get('childModelProperty');
return value;
}
This seems to work fine for keeping my UI in sync, but as soon as I call
.save()
on the parent model, I get:
Uncaught TypeError: Object #<Object> has no method 'get'
It seems that the child model kind of temporarily stops responding.
Am I doing something inherently wrong?
EDIT: The stack trace is:
Uncaught TypeError: Object #<Object> has no method 'get' publish.js:90
Backbone.Model.extend.neutralDivisionComputer publish.js:90
Backbone.Model.extend.setNeutralComputed publish.js:39
Backbone.Events.trigger backbone.js:163
_.extend.change backbone.js:473
_.extend.set backbone.js:314
_.extend.save.options.success backbone.js:385
f.Callbacks.o jquery.min.js:2
f.Callbacks.p.fireWith jquery.min.js:2
w jquery.min.js:4
f.support.ajax.f.ajaxTransport.send.d
EDIT #2 in response to comment below:
There's something basic I'm still not getting. I replaced a few references to this.get('childModel')['childModelProperty'] and now I get things like 'cannot read property childModelProperty of undefined.
I'm not yet pulling anything from the server, the parent model is just created like
define(['jquery', 'underscore', 'backbone', 'models/childmodel'], function($, _, Backbone, ChildModel) {
var ParentModel = Backbone.Model.extend({
defaults: {
childModel : new ChildModel()
}
defaults are only used when you create the model. After save is called, it will call set which will overwrite childModel with a simple javascript object. As I see it you have a couple options:
1) use Backbone.Relational
2) override set in each parent model to update the existing child model (or create it) something like the following:
children:{
childModel: ChildModel
}
set: function (key, value, options) {
var attrs;
if (_.isObject(key) || key == null) {
attrs = key;
options = value;
} else {
attrs = {};
attrs[key] = value;
}
_.each(this.children, function (childType, name) {
if (!attrs.hasOwnProperty(name))
return;
//assume the child is just a model--not a collection
var newValue = attrs[name];
delete attrs[name];
var isModel = this[name] && this[name].set;
if (isModel && newValue) {
this[name].set(newValue, options);
}
else if (newValue) {
this[name] = new childType(newValue);
}
else {
delete this[name];
}
this.trigger('change:' + name);
}, this);
return Backbone.Model.prototype.set.call(this, attrs, options);
}
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