Rails控制器来自两个模型的response_with json

Question

I want to respond_to :json in my locations_controller from both my location and beer models.

My locations controller looks like this

class LocationsController < ApplicationController
respond_to :html, :json
  # GET /locations
  # GET /locations.json
  def index
    @locations = Location.all
     respond_with(@locations,:only => [:id,:lat,:long,:name,:street_address,:place,:route],:methods => [:main_url, :beer_name])
  end 

@beer belongs_to :location and I would like :name from the beer model to be added to the above location response. This is my beers_controller .

class BeersController < ApplicationController
  respond_to :html, :json
  # GET /beers
  # GET /beers.json

  def index
    @beers = Beer.where(:location_id => params[:location_id])
    respond_with(@beers,:only => [:id,:name,:description,:price,:style,:location_id, :brewery, :available],:methods => [:label_url])      
  end

How can I do that? Thanks.

Answer 1

Take a look at: https://github.com/nesquena/rabl

Rabl provides a simple way for you to retrieve all relationships on objects, and you can build your json in a clean and easy way.

As your beer model belongs_to a location, you have two options:

• If location has_one beer, you can access direcly location.beer.name , this meaning, the name from the beer from this location.

• If you location has_many beer(s), you can make a loop to iterate on
  every beer for a location:

Code:

location.beers.each do |beer| 
   puts beer.name
end

Answer 2

the rabl gem looks like a good way to go but I decided to add this to my location model

def as_json(options={})
    super(:only => [:id,:lat,:long,:name,:street_address,:place,:route], :methods => [:main_url],
          :include => {
            :beers => {:only => [:name]}
          }
    )
  end

This does the trick for me.