[英]Ember-data createRecord with hasMany relationship without saving
I want to create a new site record. 我想创建一个新的站点记录。 The model looks like: 该模型看起来像:
var SiteModel = DS.Model.extend({
name: attr(),
...
languages: DS.hasMany('language'),
});
The language
property describes in which languages the content of a site can be written. language
属性描述了可以用哪种语言编写站点的内容。 To create the form, I need to create a model in my route. 要创建表单,我需要在我的路线中创建一个模型。 So I want to create a new record, without saving this one to the db: 所以我想创建一个新记录,而不是将其保存到db:
var WebsitesNewRoute = Ember.Route.extend({
model: function() {
return this.store.createRecord('site', {
languages: Ember.A()
});
}
}
That does not work as intended, as I got the following error: cannot set read-only property "languages" on object: <app@model:site::ember1012:null>>
. 这没有按预期工作,因为我收到以下错误: cannot set read-only property "languages" on object: <app@model:site::ember1012:null>>
。 Why is the languages
property readOnly? 为什么languages
属性readOnly? As far as I know I did not configure that in my model... 据我所知,我没有在我的模型中配置...
I know the question Ember Data- createRecord in a hasMany relationship , but in my case I don't want to save anything yet (I only want to create the model, so I could use it in my template). 我在一个hasMany关系中知道问题Ember Data-createRecord ,但在我的情况下我还不想保存任何东西(我只想创建模型,所以我可以在我的模板中使用它)。
Ember-Data defines languages
as a read-only property because it doesn't want you to replace the array. Ember-Data将languages
定义为只读属性,因为它不希望您替换该数组。 No matter if you're saving or not, Ember-Data wants you to add relationships with addObject
and remove relationships with removeObject
. 无论您是否保存,Ember-Data都希望您添加与addObject
关系并删除与removeObject
关系。
So if you wanted to add a language, you would do this: 所以如果你想添加一种语言,你会这样做:
model: function() {
var model = this.store.createRecord('site');
var language = getLanguage();
model.get('languages').addObject(language);
return model;
}
What you're doing by giving languages
to createRecord
, is essentially calling model.set('languages', Ember.A())
, and Ember-Data doesn't like that. 你为createRecord
提供languages
所做的就是调用model.set('languages', Ember.A())
,而Ember-Data不喜欢这样。
It's dumb, I know, but that's just how Ember-Data works. 我知道,这是愚蠢的,但这就是Ember-Data的工作原理。
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