howto parse nested json attributes with activeresource - ruby

Question

i am trying to parse the following jsons response via activeresource in the padrino framework from a rest-api:
{"result":"Ok","resource":"ProjectRazor::Slice::Model","errcode":0,"command":"models_query_all","response":[{"#uri":"http://192.168.0.50:8026/razor/api/model/5nBqgTngqvxPIxVJJpdeQm","#callback":{},"#version":2,"#uuid":"5nBqgTngqvxPIxVJJpdeQm","#description":"Ubuntu Precise Model","#domainname":"andreasheumaier.de","#counter":0,"#broker_plugin":"agent","#root_password":"/7bbNwa6","#log":[],"#policy_bound":null,"#hostname_prefix":"firebird","#classname":"ProjectRazor::ModelTemplate::UbuntuPrecise","#osversion":"precise","#is_template":false,"#final_state":"os_complete","#node":null,"#req_metadata_hash":{"#domainname":{"validation":"^[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9](\\.[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9])*$","example":"example.com","required":true,"description":"local domain name (will be used in /etc/hosts file)","default":"localdomain"},"#root_password":{"validation":"^[\\S]{8,}","example":"P#ssword!","required":true,"description":"root password (> 8 characters)","default":"test1234"},"#hostname_prefix":{"validation":"^[a-zA-Z0-9][a-zA-Z0-9\\-]*$","example":"node","required":true,"description":"node hostname prefix (will append node number)","default":"node"}},"#hidden":false,"#name":"ubuntu_precise","#label":"install_precise","#current_state":"init","#result":null,"#template":"linux_deploy","#noun":"model","#image_prefix":"os","#image_uuid":"4VuDj4mJDHP6bvWeztfXOO"}],"http_err_code":200}
I defined this models
class RazorJsonFormatter
include ActiveResource::Formats::JsonFormat
def decode(json)
ActiveResource::Formats::JsonFormat.decode(json)['response']
end
end
class Razor < ActiveResource::Base
include ActiveResource::Formats::JsonFormat
include ActiveResource::Extend::WithoutExtension
self.format = RazorJsonFormatter.new
self.site = "http://yellowbird:8026/razor/api/"
end
class RazorModel < Razor
set_collection_name 'model'
end
This gives following error:
RazorModel.all
NameError: wrong constant name #callback
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:1428:in `const_defined?'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:1428:in `find_or_create_resource_for'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:1278:in `block in load'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:1264:in `each'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:1264:in `load'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:1006:in `initialize'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:933:in `new'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:933:in `instantiate_record'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:929:in `block in instantiate_collection'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:929:in `collect!'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:929:in `instantiate_collection'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:901:in `find_every'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:814:in `find'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/activeresource-3.2.8/lib/active_resource/base.rb:826:in `first'
from (irb):27
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/padrino-core-0.10.7/lib/padrino-core/cli/base.rb:68:in `console'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/thor-0.15.4/lib/thor/task.rb:27:in `run'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/thor-0.15.4/lib/thor/invocation.rb:120:in `invoke_task'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/thor-0.15.4/lib/thor.rb:275:in `dispatch'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/thor-0.15.4/lib/thor/invocation.rb:109:in `invoke'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/padrino-core-0.10.7/lib/padrino-core/cli/base.rb:73:in `c'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/thor-0.15.4/lib/thor/task.rb:27:in `run'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/thor-0.15.4/lib/thor/invocation.rb:120:in `invoke_task'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/thor-0.15.4/lib/thor.rb:275:in `dispatch'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/thor-0.15.4/lib/thor/base.rb:425:in `start'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/gems/padrino-core-0.10.7/bin/padrino:9:in `<top (required)>'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/bin/padrino:19:in `load'
from /home/aheumaier/.rvm/gems/ruby-1.9.3-p194/bin/padrino:19:in `<main>'1.9.3p194
(...)
This either works with predifined ActiveResource schema. My current workaround is write all classes from scratch using rest-client
How can parse -or igore- the nested json attributes with activeresource?