quick graphql implementation for grape gem Raw

	module Grape
	module Formatter
	module Json
	class << self
	def call(object, _env)
	only = _env[Grape::Env::RACK_REQUEST_QUERY_HASH]["__only__"]
	if object.respond_to?(:to_json)
	return only.present? ? object.to_json(only: only) : object.to_json
	end
	MultiJson.dump(object)
	end
	end
	end
	end
	end
	# a = [:id, jobs: [:id, country: :id]].to_query('__only__')
	# => "__only__%5B%5D=id&__only__%5B%5D%5Bjobs%5D%5B%5D=id&__only__%5B%5D%5Bjobs%5D%5B%5D%5Bcountry%5D=id"
	# http://localhost:9292/bundles/68?__only__%5B%5D=id&__only__%5B%5D%5Bjobs%5D%5B%5D=id&__only__%5B%5D%5Bjobs%5D%5B%5D%5Bcountry%5D=id

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