Get belongsTo ID without fetching record

Question

I'm trying to fetch the belongsTo ID without fetching the actual record. My JSON API returns the ID for the belongsTo relation.

I have the following models

App.Recipe = DS.Model.extend(
  title: DS.attr()
  ingredients: DS.hasMany('ingredient', async: true)
)

App.Ingredient = DS.Model.extend(
  recipe: DS.belongsTo('recipe')
  product: DS.belongsTo('product', async: true)
)

App.Product = DS.Model.extend(
  title: DS.attr()
)

This is my route:

App.RecipeIndexRoute = Ember.Route.extend(
  model: (args) ->
    @store.find('recipe', args.recipe_id)
)

This is my controller:

I'm trying to find the product id within this controller.

App.RecipeIndexController = Ember.ObjectController.extend(
  hasRecipeInCart: null

  actions:
    toggleCart: ->
      @content.get('ingredients').then((ingredients) =>
        # how do I get product id here, without lookup up the product relation?
        # this 'get' makes Ember call: /api/v1/products/1
        # I simply want the product ID (in this case 1), without having to call the server again.
        ingredient.get('product').then((product) =>
          product.id # => 1
        )

My JSON looks like this:

HTTP GET: /api/v1/recipes/1

{
  "recipe": {
    "id":1,
    "title":"Recipe 1",
    "ingredients":[2,1]
  }
}

HTTP GET: /api/v1/ingredients?ids[]=2&ids[]=1

{
  "ingredients": [
    {
      "id":2,
      "recipe":1,
      "product":1
    },
    {
      "id":1,
      "recipe":1,
      "product":2
    }
  ]
}

score 13 · Accepted Answer · answered Jul 19 '16 at 16:36

13

This is now much easier with the ds-reference feature that was added to ember data. You can now do:

var authorId = post.belongsTo("author").id();

See http://emberjs.com/blog/2016/05/03/ember-data-2-5-released.html#toc_code-ds-references-code

answered Jul 19 '16 at 16:36

ianpetzer

1,808
1
16
20

If you want to get the id in a template, you need to write your own helper: [Ember Data issue #4407](https://github.com/emberjs/data/issues/4407) – Jacob van Lingen Oct 18 '18 at 13:27

Kingpin2k · Answer 2 · 2014-09-19T21:30:09.167

6

A ton of work is going into redoing the relationships, you can pull it out of the underlying properties from the data attribute model.get('data.product.id')

Example: http://emberjs.jsbin.com/OxIDiVU/16/edit

edited Sep 19 '14 at 21:30

answered Dec 10 '13 at 05:23

Kingpin2k

47,007
10
75
96

That also triggers a call to the server: /api/v1/products/1, for some reason. I used this code: @content.get('ingredients').then((ingredients) => ingredients.forEach((ingredient, index, enumerable) => productId = ingredient.toJSON().product # this line triggers the call to the server. – Martin Dec 10 '13 at 08:15
1

That's a ugly implementation in ED, i might need to do a PR or find out why it's fetching the models for json. – Kingpin2k Dec 10 '13 at 18:00
It's possible to get the product id like this: ingredient.get('data').product.id or ingredient._data.product.id – Martin Dec 11 '13 at 00:24
1

This nolonger works in Ember 2. How do I get belongsTo id without fetching record in newer versions of Ember (and Ember data)? – Martin Dec 01 '15 at 08:29
@Kingpin2k did you ever open anything against Ed about this? – Adam Knights Feb 15 '16 at 10:04
1

There is an easier solution nowadays: http://emberjs.com/blog/2016/05/03/ember-data-2-5-released.html#toc_code-ds-references-code You can do something like: var authorId = post.belongsTo("author").id(); – ianpetzer Jul 19 '16 at 16:38

score 5 · Answer 3 · answered Apr 04 '16 at 13:30

5

For ED 2.x, relationships have been reworked and were broken for getting underlying data until the ds-references feature landed.

To do this in ED 2.4+, you need to use the new belongsTo method to work with underlying data.

To get an id for a belongsTo ref:

var id = this.get('model').belongsTo('myBelongsToKey').value();

answered Apr 04 '16 at 13:30

James_1x0

892
10
20

1

ds-references has landed :) http://emberjs.com/blog/2016/05/03/ember-data-2-5-released.html#toc_code-ds-references-code – ianpetzer Jul 19 '16 at 16:37

Get belongsTo ID without fetching record

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