Backbone model.save() 导致 POST not PUT [英] Backbone model.save() is causing POST not PUT

问题描述

我有一个 Backbone 模型:

I have a Backbone model:

var User = Backbone.Model.extend({
  idAttribute: '_id',

  url: '/api/user',

  defaults:
    { username: ''
    }
});

我去拿了:

var user = new User();

user.fetch();

现在，作为我的一个视图中的 click 事件，我有这个:

Now, as an click event in one of my views, I have this:

toggleSubscription: function () {
  user.set('subscriptions', true);
  user.save();
}

这会导致 POST 请求.但是，该记录已经存在于服务器上，并且由于我获取了它(并且模型实例具有 id 属性)，我认为 Backbone 应该执行 PUT 而不是 POST.为什么它会改为执行 POST?

This causes a POST request. However, the record already exists on the server, and since I fetched it (and the model instance has an id property), I thought that Backbone should do a PUT instead of a POST. Why might it be doing a POST instead?

推荐答案

尝试检查 user.isNew().

看起来您创建了一个没有 ID 的新模型，这就是它尝试在 Backbone.sync 期间添加它的原因.

Looks like you created a new model which does not have an ID, that's why it's trying to add it during Backbone.sync.

更新:

以上是完全正确的.它执行 POST 因为它是一个新模型(这意味着它没有 id).在获取模型之前，您需要给它一个 id.在您的示例中:

Above is exactly true. It does POST because it's a new model (which means, it does not have an id). Before you fetch a model, you need to give it an id. In your example:

var user = new User();
user.fetch();
user.save(); // in XHR console you see POST

var user = new User({ id: 123 });
user.fetch();
user.save(); // in XHR console you see PUT

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