Inconsistent JSON/XML output, missing RABL config option to collapse nodes to array consistently

[chinshr]

The problem appears to be an inconsistency between XML and JSON output and that there is currently no config option that allows app developers to collapse nodes like {"bundles"=>[{:bundle => {...}}]} (this happens for :json response format) or {"bundles"=>"bundle"=>[{...}]} (this happens for :xml response format) to {"bundles"=>[{...}, {...}]}

The particular context is to create a generic application.rabl layout that requires this structure, e.g. {"bundles"=>[{...}, {...}], "code": "1", "message": "OK"}

# application.rabl
# Constructs a response like:
# {"bundles"=>[{...}, {...}], "code": "1", "message": "OK"}
#
object @response
node do
  case response.content_type
  when Mime::JSON
    # Since RABL converts collections to {"bundles"=>[{:bundle => {...}}]}
    # we need to apply this ugly hack to make it look such as
    # {"bundles"=>[{...}, {...}]}
    res = Yajl::Parser.parse(content_for(:layout))
    if res.try(:[], controller_name).is_a?(Array)
      res[controller_name] = res[controller_name].map {|b| b["bundle"]}
    end
    res
  when Mime::XML
    # Again RABL gives us elements like <bundles><bundle></bundle></bundles>
    # that is parsed to hash as {"bundles"=>"bundle"=>[{...}]} which
    # makes us this this hack, which transforms it to 
    # {"bundles"=>[{...}, {...}]}
    res = Nori.new(:parser => :nokogiri, :advanced_typecasting => false).parse(content_for(:layout))
    if res.try(:[], controller_name).try(:[], controller_name.singularize)
      res[controller_name] = res[controller_name][controller_name.singularize]
    end
    res
  end
end
node :code do |response|
  response.code
end
node :message do 
  response.message || [Api::Code.get_message(self.code)]
end

My index.rabl looks like this:

collection @bundles, :root => :bundles
extends "api/v2/bundles/show"

And the show.rabl like this:

object @bundle
attributes :id, :name, :status, :bundle_type, :begin_at, :end_at, :updated_at, :created_at

My config looks like this:

Rabl.configure do |config|
  config.include_json_root = true
  config.include_xml_root = false
  config.include_child_root = false
  config.xml_options = {:skip_types => true, :skip_instruct => true, :indent => 0, :dasherize => false}
end

This is related to Stack Overflow question Parsing XML to hash with RABL and Does RABL's JSON output not conform to standard? Can it?