Rails 4 render json nested objects - ruby-on-rails

Question

I need to render as Json a complex structure. I have next structure working:
render :json => #booking, :include => [:paypal,
:boat_people,
:boat => {:only => :boat_model, :include => {:boat_model => {:only => :name, :include => { :boat_type => {:only => :name}}}}}]
but I´m not able to add a port attribute with some other nested attributes to :boat, such as :boat_model (at same level).
UPDATE:
Although it´s not working, I include my port attribute.
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}}]}]
I mean, boat_model and port are both boat attributes.
This is the model object:
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

I got it.
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

You are probably going to want a much more robust system for displaying JSON. The built-in Rails helpers are really designed primarily for simple additions that enable users to do most of what they would want to accomplish. However, in your case, you are trying to make it do more than it was designed for.
I would highly recommend either creating a view object or using a gem like RABL.
My preference is to use Rabl for complex JSON. It basically creates the 'view object' for you by building a domain specific language that makes it relatively easy to build complex JSON objects in rails.
RABL basically allows you to build views that format JSON instead of HTML. The DSL is extremely rich and enables you to do just about anything you would want. In your case, I think the code would look something like this:
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