currencies_controller.rb

# This could be improved i'm sure..

class Api::V1::CurrenciesController < ApplicationController
  respond_to :json

  def index
    render(default_serializer Currency.all)
  end

  def show
    render( default_serializer Currency.find(params[:id]) )
  end

  private

  def default_serializer records
    { json: records, each_serializer: Api::V1::CurrencySerializer }
  end
end

currency_serializer.rb

class Api::V1::CurrencySerializer < ActiveModel::Serializer
  attributes :id, :country, :rate
end

MODEL-currency.js.coffee

App.Currency = DS.Model.extend
  country: DS.attr()
  rate: DS.attr()

store.js.coffee

App.Store = DS.Store.extend
  adapter: DS.ActiveModelAdapter.extend
    namespace: 'api/v1'