JSON script in Jbuilder declaration for getting object fields.

index.json.jbuilder

###
 # JSON script in Jbuilder declaration for getting object fields.
 #
 # @namespace Belanton.Codes.Rails.Jbuilder
 # @see       https://gist.github.com/leonardomarques/d40ecd7a63a30b314444
 # @author    Leonardo Marques <leonardo.marques@belanton.com>
 # @license   Licensed under the MIT license [http://www.opensource.org/licenses/mit-license.php]
 # @copyright Copyright (c) 2013 Belanton, Inc. [http://www.belanton.com]
###

case params[:fields]
when 'name' # Get a array of name.
  json.array! @objects.map(&:name).uniq.compact
when 'names' # Get a hash with named array.
  json.names @objects.map(&:name).uniq.compact
else # Default response of Rails scaffolds.
  json.array!(@objects) do |object|
    json.extract! object, :name
    json.url object_url(object, format: :json)
  end
end