Rabl显示空的json块

Question

我正在尝试Rabl，但是，我似乎收到了一个几乎空的json块。

require_dependency "api/application_controller"

module Api
  class RentablePropertiesController < ApplicationController
    respond_to :json
    def index
      @r = Core::RentableProperty.all
      # render :text => @r.to_json  --> note: this renders the json correctly
      render "api/rentable_properties/index"  #note: rabl here does not
    end
  end
end

index.json.rabl collection @r

产量

[{"rentable_property":{}}]

注意：使用简单的@ r.to_json，它可以正确呈现：

[{"id":1,"description":"description","property_type_id":1,"created_at":"2013-08-22T19:04:35.000Z","updated_at":"2013-08-22T19:04:35.000Z","title":"Some Title","rooms":null,"amount":2000.0,"tenure":null}]

知道为什么rabl不起作用？

Answer 1

RABL（ https://github.com/nesquena/rabl#overview ）的文档说明您需要确定要在JSON中显示的属性。

他们的例子：

# app/views/posts/index.rabl
collection @posts
attributes :id, :title, :subject
child(:user) { attributes :full_name }
node(:read) { |post| post.read_by?(@user) }

访问/posts.json时会输出以下JSON或XML：

[{  "post" :
  {
    "id" : 5, title: "...", subject: "...",
    "user" : { full_name : "..." },
    "read" : true
  }
}]