现有模型上的 .save() 导致 POST 而不是 PUT [英] .save() on existing model causes POST instead of PUT

问题描述

我在保存对集合中单个模型的更改时遇到了一些问题.已加载(通过集合 .reset())的模型正在发出 POST(就像它们是新的)而不是预期的 PUT.

I'm having some trouble saving changes to individual models in a collection. Models that have been loaded (via a collection .reset()) are issuing a POST (as if they were new) instead of the expected PUT.

这是我正在采取的方法:

Here's the approach I'm taking:

AppView

• 通过 this.model.childcollection.reset(JSON DATA FROM SERVER) 加载子集合；

• Loads the child collection via this.model.childcollection.reset(JSON DATA FROM SERVER);

在它的渲染函数中，为集合中的每个项目创建一个新的子视图并渲染它:

In it's render function, creates a new childview for each item in the collection and renders it:

render: function() {
        var el = this.el;
        this.model.childcollection.forEach(function(s) {
        var view = new ChildView({ model: s });
        el.append(view.render().el);
    });
    return this;
},

子视图

• 在它的一个事件中，它改变了底层模型的一些值并调用了保存:

• In one of its events it is changing some values of the underlying model and calling save:

this.model.set(
        {
            ValueA: somevalue,
            ValueB: somevalue
        },
        {
            error: function() {
                console.log("Error saving model");
            },
            success: function() {
                console.log("Model change saved");
            }
        });
    this.model.save();

观察:

• 调用POST(没有子ID)而不是PUT(有子ID)
• 子元素设置了 Id

谁能告诉我为什么会发生这种情况?

Can anyone tell me why this may be happening?

推荐答案

backbone 使用模型的 .id 属性(不是属性)来确定它应该放置还是发布，如下所示源代码:https://github.com/documentcloud/backbone/blob/master/骨干.js#L344-346

backbone used the .id property (not attribute) of the model to determine whether it should put or post, as shown here in the source code: https://github.com/documentcloud/backbone/blob/master/backbone.js#L344-346

如果它在保存现有模型时进行发布，则意味着 .id 属性未正确加载.即使对 model.get("id") 的调用返回正确的结果，对 model.id 的调用也必须返回正确的结果才能知道这是不是新型号.

if it's doing a post when saving an existing model, this means the .id property wasn't loaded correctly. even if a call to model.get("id") returns the right result, a call to model.id must return the right result for it to know that this is not a new model.

确保您模型的 id 属性称为 id，如果不是，请确保在您的模型上设置 idAttribute:

be sure you're model's id attribute is called id, or if it's not, be sure to set the idAttribute on your model:

MyModel = Backbone.Model.extend({
  idAttribute: "myCustomId"
});

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