用于 model.save() 的 Backbone.js/express.js 参数 [英] Backbone.js/express.js parameters for model.save()

问题描述

我在客户端使用 Backbone.js，在后端使用 node.js，但在进行有限"模型保存时遇到了一些麻烦，如下所述:http://backbonejs.org/#Model-save

如示例所示，如果我这样做

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

如何使用 express.js 访问保存的参数，即我只想保存到作者"字段的事实?我已经尝试了以下

req.body ->给出正在保存的模型的所有参数，我只想要作者"字段req.query ->空的

非常感谢任何帮助！

解决方案

如Model.save 文档中所述:

<块引用>

保存 model.save([attributes], [options])
[...] 属性散列(如集合)应该包含你想要改变的属性——未提及的键不会被更改 — 但是，完整的资源的表示将被发送到服务器.

然而，您可以覆盖 save 方法并通过选项提供 data 属性，该选项将发送到服务器而不是完整的模型表示.例如，这只会保存传递给方法的属性:

var M = Backbone.Model.extend({保存:功能(属性，选项){选项 ||(选项 = {});options.contentType = '应用程序/json';options.data = JSON.stringify(attrs);Backbone.Model.prototype.save.call(this, attrs, options);}});

还有一个小提琴 http://jsfiddle.net/dLFgD/

<小时>

正如@mikebridge 在评论中指出的那样，现在可以通过传递 attrs 选项来获得此行为.所以要么使用

book.save(null, {属性:{作者:泰迪"}});

或保留覆盖

var M = Backbone.Model.extend({url: '/echo/json/',保存:功能(属性，选项){选项 ||(选项 = {});options.attrs = attrs;Backbone.Model.prototype.save.call(this, attrs, options);}});

http://jsfiddle.net/nikoshr/dLFgD/7/<小时>

如果您使用支持它的 Backbone 版本 (>=0.9.9) 并且您的服务器理解该动词，您也可以发送 PATCH 请求，如 在@pkyeck 的回答中解释

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

As in the example, if I do

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

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

Any help much appreciated!

解决方案

As stated in Model.save documentation:

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.

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);
    }
});

And a Fiddle http://jsfiddle.net/dLFgD/

---

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"}
});

or keep the override

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/

---

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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