Backbone 中的计算属性 [英] Computed properties in Backbone

问题描述

我有一个场景，在客户端上处理的数据以不同于在服务器上表示的方式呈现和交互.

I have a scenario where the data being manipulated on the client is presented and interacted with in a different way than it is represented on the server.

考虑从服务器返回的以下 event 资源.

Consider the following event resource returned from the server.

{
  "id": 123,
  "start_at": 1331336004906,
  "end_at": 1331337704906
}

以及以下用于编辑的模板:

And the following template for editing:

<form>
  <!-- Notice how date and time are separated in the interface -->
  <input type="text" name="start_date" value="{{start_date}}" />
  <input type="text" name="start_time" value="{{start_time}}" />

  <!-- Instead of asking for an end date/time, we ask for the duration -->
  <input type="text" name="duration" value="{{duration}}" />

  <input type="submit" />
</form>

如何将 start_date、start_time 和 duration 作为我的 Backbone 模型中的属性而不将它们发送到服务器?我应该修改 .toJSON() 吗?

How would I go about treating start_date, start_time, and duration as attributes in my Backbone model without sending them to the server? Am I supposed to modify .toJSON()?

推荐答案

你的模型应该尽可能地与服务器端的模型一致.所以坚持使用 start_at 和 end_at.这将大大简化您的 sync() 操作.

Your model should correspond as closely as possible to what you have server side. So stick with start_at and end_at. That will greatly simplify your sync() operations.

在编辑表单的查看中，您可以:

On your edit form's View, you can:

1. 通过简单的函数计算start_date、start_time、duration并在模板中调用它们.
2. 提交时转换为 start_at 和 end_at.

1. Compute start_date, start_time, duration through simple functions and call them in the template.
2. Convert to start_at and end_at on submitting.

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