将模型保存在本地存储中

发布于 2024-12-06 22:09:26 字数 792 浏览 0 评论 0原文

我正在使用 Jerome 的 localStorage 适配器与 Backbone，它非常适合集合。

但是，现在我需要保存一个模型。所以在我的模型中我设置：

localStorage: new Store("msg")

然后我进行保存并获取。我的问题是，每次刷新并初始化我的应用程序时，我的模型的新表示都会添加到 localStorage 中，请参见下文。

我做错了什么？

window.localStorage.msg = {
  // Created after first run
  "1de5770c-1431-3b15-539b-695cedf3a415":{
    "title":"First run",
    "id":"1de5770c-1431-3b15-539b-695cedf3a415"
  },
  // Created after second run
  "26c1fdb7-5803-a61f-ca12-2701dba9a09e":{
    "0":{
      "title":"First run",
      "id":"1de5770c-1431-3b15-539b-695cedf3a415"
    },
      "title":"Second run",
      "id":"26c1fdb7-5803-a61f-ca12-2701dba9a09e"
    }
  }

原文

I'm using Jerome's localStorage adapter with Backbone and it works great for collections.

But, now I have a single model that I need to save. So in my model I set:

localStorage: new Store("msg")

I then do my saves and fetch. My problem is that everytime I do a refresh and initialize my app a new representation of my model is added to localStorage, see below.

What am I doing wrong?

window.localStorage.msg = {
  // Created after first run
  "1de5770c-1431-3b15-539b-695cedf3a415":{
    "title":"First run",
    "id":"1de5770c-1431-3b15-539b-695cedf3a415"
  },
  // Created after second run
  "26c1fdb7-5803-a61f-ca12-2701dba9a09e":{
    "0":{
      "title":"First run",
      "id":"1de5770c-1431-3b15-539b-695cedf3a415"
    },
      "title":"Second run",
      "id":"26c1fdb7-5803-a61f-ca12-2701dba9a09e"
    }
  }

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双马尾 2024-12-13 22:09:26

我遇到了同样的问题。也许您有类似的东西，

var Settings = Backbone.Model.extend({
  localStorage: new Store("Settings"),
  defaults: { a: 1 }
});

var s = new Settings;
s.fetch();

我更改为

var s = new Settings({ id: 1 });

localStorage 适配器检查 id，例如

 case "read":    resp = model.id ? store.find(model) : store.findAll(); break;

0 或 "" for id 不起作用，它将返回一个中的所有模型

I ran into same issue. Maybe you have something similar to this

var Settings = Backbone.Model.extend({
  localStorage: new Store("Settings"),
  defaults: { a: 1 }
});

var s = new Settings;
s.fetch();

I changed to

var s = new Settings({ id: 1 });

localStorage adapter check for id like

 case "read":    resp = model.id ? store.find(model) : store.findAll(); break;

so 0 or "" for id wont work and it will return all models in one

回复收藏 0 原文

迟月 2024-12-13 22:09:26

我对backbone.js 也是新手，但看起来持久性模型类似于数据库表。也就是说，它旨在从表中创建/删除/读取记录。 localStorage 适配器执行相同的操作，因此您要做的是创建一个 Msg“表”
在 localStorage 中，每次创建一个新的 Msg“记录”，并且适配器为每个新的 Msg 提供一个唯一的 id。

如果您只有一个对象，那么直接使用 localStorage 可能会更容易。 API 非常简单：

localStorage.setItem("key","value");

请记住，localStorage 仅将键/值对作为字符串处理，因此您需要在字符串格式之间进行转换。

看看这个问题，了解更多相关信息：

在 HTML5 localStorage 中存储对象

I'm new to backbone.js too, but it looks like the persistence model is analogous to database tables. That is to say, it's designed to create/delete/read records from a table. The localStorage adapter does the same, so what you are doing there is creating a Msg "table"
in localStorage, and creating a new Msg "record" each time, and the adapter gives each new Msg a unique id.

If you just have one object, it's probably easier to just use localStorage directly. The API is really straight forward: