Backbone.js的 - 自定义的制定者 [英] Backbone.js - custom setters

问题描述

想象一下，一个简单的模型骨干像

Imagine a simple backbone model like

window.model= Backbone.Model.extend({
   defaults:{
      name: "",
      date: new Date().valueOf()
   }
})

我试图找到一种方法，始终使模型店提供了小写的名字，不论输入。即，

I'm trying to find a way to always make the model store the name in lower-case irrespective of input provided. i.e.,

model.set({name: "AbCd"})
model.get("name") // prints "AbCd" = current behavior
model.get("name") // print "abcd" = required behavior

什么是这样做的最佳方式？这里是所有我能想到的：

What's the best way of doing this? Here's all I could think of:

1. 覆盖set的方法


2. 使用一个SantizedModel，它监听在此基础上模式的​​变化和存储消毒的投入。然后，所有视图code将通过这种消毒模式来代替。

具体小写我提到可能在技术上被认为能更好地处理，例如在获取它，但是想象一下，在这里，比方说，用户在磅输入值不同的情况下，我只想要存储在$ S值我的数据库。也有可能是同一型号不同的看法，我不希望有的确无处不在其使用了与toLowerCase。

The specific "to lower case" example I mentioned may technically be better handled by the view while retrieving it, but imagine a different case where, say, user enters values in Pounds and I only want to store values in $s in my database. There may also be different views for the same model and I don't want to have to do a "toLowerCase" everywhere its being used.

思考？

推荐答案

更新：您可以使用插件：<一href=\"https://github.com/berzniz/backbone.getters.setters\">https://github.com/berzniz/backbone.getters.setters

您可以覆盖set方法如下（将它添加到您的模型）：

You can override the set method like this (add it to your models):

set: function(key, value, options) {
    // Normalize the key-value into an object
    if (_.isObject(key) || key == null) {
        attrs = key;
        options = value;
    } else {
        attrs = {};
        attrs[key] = value;
    }

    // Go over all the set attributes and make your changes
    for (attr in attrs) {
        if (attr == 'name') {
            attrs['name'] = attrs['name'].toLowerCase();
        }
    }

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

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