gistfile1.rb

# controllers/api/venues_controller.rb
module API
  class VenuesController < ApplicationController
    respond_to :json
    
    def show
      @venue = Venue.find(params[:id])
      render json: @venue
      #respond_to do |format|
      #  format.json { render :json => venue }
      #end
    end
  
  end
end

#routes.rb
...
  #API Routes
  
  namespace :api, path: '/', constraints: { subdomain: 'api' } do
    resources :venues, only: [ :index, :show ]
  end