ruby-on-rails – Rails 4渲染json嵌套对象

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

但是我无法将一些其他嵌套属性的port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port属性.

render :json => @booking,: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都是船的属性.

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