如何使用字符串作为主键与Ember Data？ [英] How to use a string as a primary key with Ember Data?

问题描述

我有以下代码：

Pult.Zone = DS.Model.extend({
  name: DS.attr('string'),
  authoritative: DS.attr('boolean'),
  user_id: DS.attr('number'),
  rulesets: DS.hasMany('Pult.Ruleset')
});

Pult.RESTAdapter.map('Pult.Zone', {
  primaryKey: 'name',
  rulesets: { key: 'rulesetIds' }
});

但是，看起来似乎没有正确的选择主键。我已经提交了所有区域的列表。

However, it doesn't seem like is picking up on the primary key correctly. I have rendered a list of all zones.

这是一个测试用例：

zones = Pult.store.findAll(Pult.Zone);
zones.get('length'); // Returns 10
zones = Pult.store.findAll(Pult.Zone);
zones.get('length'); // Returns 20

所以每次从服务器加载区域时，都会将它们添加到本地列表中，因为它不认为它们已经存在。任何方法来解决这个问题，还是要尝试模拟一些代理键？

So every time I load zones from the server, it adds them to the local list, since it does not recognize them as already existing. Any way to fix this, or will I have to try to mock up some surrogate keys?

推荐答案

升级到 Ember Data 1.0.0 Beta 2 ，我发现一个解决方案：

After upgrading to Ember Data 1.0.0 Beta 2, I found a solution that works:

App.Zone = DS.Model.extend({
  name: DS.attr('string'),
  user_id: DS.attr('number'),
});

App.ZoneSerializer = DS.RESTSerializer.extend({
  normalize: function(type, hash, property) {
    // Ember Data use the zone name as the ID.
    hash.id = hash.name;

    // Delegate to any type-specific normalizations.
    return this._super(type, hash, property);
  }
});

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