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I am trying to search through several thousand records for a particular record. I have loaded a User model and it has several thousand Shipments that are async. In other words I have the serializer send down shipment_ids with the user model.

App.User = DS.Model.extend({
  shipments: DS.hasMany('shipment', { async: true })
});

I want to search through all those ids to see if a particular record's id is among them. However I don't want to go to the api and load each and every single record. I just want to be able to search through the shipment_ids.

I have a jsbin that showcases it loading all the records. How do I change this so it doesn't make any api calls for a shipment and still finds the specific record?

Instead of doing

this.get('shipments').any(function(shipment){
  return shipment.get('id') === "10124";

there has to be a way to go through only the ids, no?

Thanks!

bfcoder
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3 Answers3

2

This hack is very smelly but it's the only way I have found. And it is to search with _data

this.get('content._data.shipments').any(function(shipment){
  return shipment.get('id') === "10124";
});

It won't make any api calls. But there has to be a more acceptable method that won't be prone to breakage when updating Ember.

Here is an updated jsbin to show this. Does anyone have a better solution?

Thanks!

bfcoder
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2

The solution described in "Get belongsTo ID without fetching record" seems to work as of Ember Data 1.0.0-beta.10. Briefly, you can do the following to access the underlying 

modelInstance.get('data.belongsToRelation.id');

Presumably you can also do this (though I have not tested it):

modelInstance.get('data.hasManyRelation');

Original Answer (DO NOT USE):

I have accomplished this on a belongsTo by adding a second model field for the id. My example:

App.User = DS.Model.extend({ group: DS.belongsTo('group', { async: true }), groupId: DS.attr('number') });

So maybe you can do this?

App.User = DS.Model.extend({ shipments: DS.hasMany('shipment', { async: true }), shipmentIds: DS.attr('array') });

You will need to add an array transform in app/transforms/array.js (assuming you use ember-cli)

import DS from 'ember-data';

var ArrayTransform = DS.Transform.extend({ deserialize: function(serialized) { return serialized; }, serialize: function(deserialized) { return deserialized; } });

export default ArrayTransform;

Let me know if it works as I probably will need to something similar in my app soon.

Community
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gordonc
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  • This indeed does work. I never thought to capture the ids from the json like that. [http://jsbin.com/wofig/3/](http://jsbin.com/wofig/3/) You can also leave out the array transform and Ember will guess it is an array. [http://jsbin.com/wofig/4/](http://jsbin.com/wofig/4/) Thanks! – bfcoder Nov 01 '14 at 14:23
  • Hi, I just realized that my approach causes some serious bugs for belongsTo. Basically once you add the `groupId`: DS.attr('number') property it will mess up the normalization process and break the async lookup of the belongs to relationship. I'll see if I can think of a work around but in the meantime be warned. – gordonc Nov 07 '14 at 15:03
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    So your update is essentially doing what my original answer was. :] – bfcoder Nov 19 '14 at 23:16
  • mmmm @bfcoder there is a difference - your answer uses `_data` instead of `data`. – leejt489 Nov 23 '14 at 09:11
  • @leejt489 While you are correct, it is still the same data. It is just accessed in a different way. – bfcoder Nov 26 '14 at 14:17
  • @bfcoder yeah sorry to disappoint. Depending on the serializer you are using the original hack I wrote will work - but be careful because it caused me a ton of headaches – gordonc Nov 28 '14 at 17:21
2

Since Ember Data 2.3 you can use this code:

// get all ids without triggering a request
var commentIds = post.hasMany('comments').ids();

See http://emberjs.com/blog/2016/01/12/ember-data-2-3-released.html for details.

Envek
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