Ember Data嵌套资源URL

Question

假设我有一个带有以下布局的Rails应用程序(从我的实际项目中简化了一下):

User
    has many Notes

Category
    has many Notes

Note
    belongs to User
    belongs to Category

注释可以在以下位置获得:

/users/:user_id/notes.json
/categories/:category_id/notes.json

但不是:

/notes.json

在整个系统中有太多的Notes要在一个请求中向下发送 - 唯一可行的方法是仅发送必要的Notes(即,属于用户试图查看的用户或类别的Notes).

用Ember Data实现这个的最佳方法是什么？

Answer 1

我会说简单:

灰烬模特

App.User = DS.Model.extend({
  name: DS.attr('string'),
  notes: DS.hasMany('App.Note')
});

App.Category = DS.Model.extend({
  name: DS.attr('string'),
  notes: DS.hasMany('App.Note')
});

App.Note = DS.Model.extend({
  text: DS.attr('string'),
  user: DS.belongsTo('App.User'),
  category: DS.belongsTo('App.Category'),
});

Rails控制器

class UsersController < ApplicationController
  def index
    render json: current_user.users.all, status: :ok
  end

  def show
    render json: current_user.users.find(params[:id]), status: :ok
  end
end

class CategoriesController < ApplicationController
  def index
    render json: current_user.categories.all, status: :ok
  end

  def show
    render json: current_user.categories.find(params[:id]), status: :ok
  end
end

class NotesController < ApplicationController
  def index
    render json: current_user.categories.notes.all, status: :ok
    # or
    #render json: current_user.users.notes.all, status: :ok
  end

  def show
    render json: current_user.categories.notes.find(params[:id]), status: :ok
    # or
    #render json: current_user.users.notes.find(params[:id]), status: :ok
  end
end

注意:这些控制器是简化版本(索引可以根据请求的ID进行过滤,......).您可以查看如何使用ember数据获取parentRecord id以供进一步讨论.

主动模型序列化器

class ApplicationSerializer < ActiveModel::Serializer
  embed :ids, include: true
end

class UserSerializer < ApplicationSerializer
  attributes :id, :name
  has_many :notes
end

class CategorySerializer < ApplicationSerializer
  attributes :id, :name
  has_many :notes
end

class NoteSerializer < ApplicationSerializer
  attributes :id, :text, :user_id, :category_id
end

我们包括侧向载荷数据在这里,但你可以避开它,设定include参数false在ApplicationSerializer.

用户,类别和备注将在ember-data接收和缓存时显示,并且将根据需要请求缺少的项目.