获取属于ID而不提取记录 [英] Get belongsTo ID without fetching record

问题描述

我试图获取belongsTo ID而不读取实际记录。我的JSON API返回了belongsTo关系的ID。

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

我有以下型号

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()
)

这是我的路线：

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

这是我的控制器：

我正在尝试在此控制器中查找产品ID。

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
        )

我的JSON看起来像这样：

HTTP GET：/ api / v1 / recipes / 1

HTTP GET: /api/v1/recipes/1

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

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

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

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

推荐答案

使用添加到ember数据的ds参考功能，现在可以轻松实现。你现在可以做：

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();

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

这篇关于获取属于ID而不提取记录的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！