Backbone.js的为model.save / EX press.js参数（） [英] Backbone.js/express.js parameters for model.save()

问题描述

我使用Backbone.js的客户端和node.js的在后端上，和我有一点做一个'有限'的模式省事，如下解释：的http://backbonejs.org/#Model-save

I'm using Backbone.js on the client and node.js on the backend, and I'm having a bit of trouble doing a 'limited' model save, as explained here : http://backbonejs.org/#Model-save

如在例如，如果我

book.save({author: "Teddy"});

我怎么访问的参数保存使用前press.js，即事实，我只是想保存到作者字段？我试过以下

how do I access the parameters of the save using express.js, i.e. the fact that I only want to save to the 'author' field? I've tried the following

req.body -> gives ALL parameters of the model being saved, I want only the 'author' field
req.query -> empty

任何帮助非常AP preciated！

Any help much appreciated!

推荐答案

Model.save文档中所述：

保存 model.save（[属性]，[选项]）的结果
  [...]属性的散列（如设置）应包含你想改变属性 -
  未提及键不会改变 - 但是，一个完成
  再资源的presentation 将被发送到服务器。

save model.save([attributes], [options])
[...] The attributes hash (as in set) should contain the attributes you'd like to change — keys that aren't mentioned won't be altered — but, a complete representation of the resource will be sent to the server.

但是，您可以覆盖保存方式，通过将被发送到服务器，而不是完整的模型重新presentation的选项提供了一个数据属性。例如，这将只保存传递给该方法的属性：

You can however override the save method and provide a data attribute via the options which will be sent to the server instead of the full model representation. For example, this will only save the attributes passed to the method :

var M = Backbone.Model.extend({   
    save: function (attrs, options) {
        options || (options = {});

        options.contentType = 'application/json';
        options.data = JSON.stringify(attrs);

        Backbone.Model.prototype.save.call(this, attrs, options);
    }
});

和小提琴 http://jsfiddle.net/dLFgD/

由于@mikebridge在评论中指出，这种行为现在可以通过传递一个 ATTRS 选项获得。因此，无论使用

As @mikebridge noted in the comments, this behavior can now be obtained by passing an attrs option. So either use

book.save(null, {
    attrs: {author: "Teddy"}
});

或保持覆盖

var M = Backbone.Model.extend({
    url: '/echo/json/',

    save: function(attrs, options) {
        options || (options = {});      
        options.attrs = attrs;
        Backbone.Model.prototype.save.call(this, attrs, options);
    }
});

http://jsfiddle.net/nikoshr/dLFgD/7/

您还可以，如果您使用的是支持它的主干版本（> = 0.9.9）发送PATCH请求和服务器理解动词，为的在@ pkyeck的回答解释

You could also send a PATCH request if you're using a Backbone version that supports it (>=0.9.9) and your server understands that verb, as explained in @pkyeck's answer

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