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

问题描述

我在客户机上使用Backbone.js，在后端使用node.js，并且在限制模式保存时遇到麻烦，如下所述： 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

如例如，如果我执行

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

如何使用express.js访问保存的参数，即我只想要保存到作者字段？我尝试了以下

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

任何帮助非常感谢！

推荐答案

如 Model.save文档：

保存属性]，[选项]）

[...]属性哈希（如集合中）应包含要更改的属性 -
键，提到的提示不会被更改 - 但是，完整的
表示资源将被发送到服务器。

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，您可以覆盖保存方法，并通过将发送到服务器的选项提供数据属性，而不是完整的模型表示。例如，这将只保存传递给方法的属性：

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/

正如@mikebridge所说注释，现在可以通过传递 attrs 选项来获取此行为。所以要么使用

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"}
});

或保留覆盖

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/

如果您使用支持它的Backbone版本（> = 0.9.9），并且您的服务器了解该动词，您也可以发送PATCH请求，如

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

这篇关于model.save（）的Backbone.js / express.js参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！