Rails 4 渲染 json 嵌套对象

Question

我需要将复杂的结构呈现为 Json。我有下一个结构工作：

render :json => @booking, :include => [:paypal, 
                                       :boat_people,
                                       :boat => {:only => :boat_model, :include => {:boat_model => {:only => :name, :include => { :boat_type => {:only => :name}}}}}] 

但我无法将带有其他一些嵌套属性的端口属性添加到 :boat，例如 :boat_model （在同一级别）。

更新：

虽然它不起作用，但我包含了我的端口属性。

render :json => @booking, :include => [:paypal, 
                                       :boat_people,
                                       :boat => {:only => [:boat_model => {:include => {:boat_model => {:only => :name, :include => { :boat_type => {:only => :name}}}}},
                                                           :port => {:include => :city => {:only => name}}]}]

我的意思是，boat_model 和 port 都是船属性。

这是模型对象：

class Boat < ActiveRecord::Base

  attr_accessor :price
  @price

  attr_accessor :extrasPrice
  @extrasPrice

  def as_json(options = { })
    h = super(options)
    h[:price] = @price    
    h[:extrasPrice] = @extrasPrice
    h
  end


  belongs_to :boat_model
  belongs_to :port
  belongs_to :state
  has_many :photos
end

Answer 1

我明白了。

render :json => @booking, :include => [:paypal, 
                                       :boat_people,
                                       :boat => {:only => :name, :include => {:port => {:only => :name, :include => {:city => {:only => :name, :include => {:country => {:only => :name}}}}}, 
                                                :boat_model => {:only => :name, :include => {:boat_type => {:only => :name}}}}}]

Answer 2

您可能需要一个更强大的系统来显示 JSON。内置的 Rails 帮助器实际上主要是为简单的添加而设计的，使用户能够完成他们想要完成的大部分工作。但是，在您的情况下，您正试图让它做的比设计的要多。

我强烈建议创建 view object 或使用像 RABL 这样的 gem。

我的偏好是将 Rabl 用于复杂的 JSON。它基本上通过构建特定领域的语言为您创建“视图对象”，这使得在 Rails 中构建复杂的 JSON 对象变得相对容易。

RABL 基本上允许您构建格式为 JSON 而不是 HTML 的视图。 DSL 非常丰富，可以让您做任何您想做的事情。在你的情况下，我认为代码看起来像这样：

app/views/bookings/show.rabl

object @booking
#these are attributes that exist on your booking model: 
attributes :booking_attribute, :other_booking_attribute

child :paypal do
  #these are attributes that exist on your paypal model:
  attributes :paypay_attribute1, :other_paypal_attribute
end

child :boat_people do
  #boat_people attributes that you want to include
  attributes :blah_blah
end

child :boat do
  #boat attributes that you want to include
  attributes :boat_attribute1, :boat_attribute2

  child :boat_model do
    attributes :name

    child :boat_type do
      attributes :name
    end
  end

end