ActiveResource: Access to data and meta objects in JSON response.

collection.json

{
  "data": [
    {"id": 7, "name": "Boston"},
    {"id": 3, "name": "Chicago"},
    {"id": 1, "name": "San Francisco"}
  ],
  "meta": {
    "errors": [],
    "message": "",
    "next": null,
    "prev": null,
    "status": 200
  }
}

single.json

{
  "data": {
    "id": 1, 
    "name": "San Francisco"
  }, 
  "meta": {
    "errors": [],
    "message": "",
    "status": 200
  }
}

your_base_resource.rb

class YourBaseResource < ActiveResource::Base
  attr_accessor :errors, :meta

  self.site     = 'localhost:3000'
  self.format   = :json

  self.collection_parser = YourCollectionParser

  def initialize(attributes = {}, persisted = false)
    # YourCollectionParser assigns these values to the collection
    # Here we add access to meta and errors on single resource
    if attributes.has_key?('meta')
      @meta      = attributes['meta']
      @errors    = attributes['meta']['errors']
      attributes = attributes['data']
    end
    @attributes     = {}.with_indifferent_access
    @prefix_options = {}
    @persisted = persisted
    load(attributes, false, persisted)
  end
end

your_collection_parser.rb

class YourCollectionParser << ActiveResource::Collection
  attr_accessor :errors, :meta
  
  def initialize(parsed = {})
    @elements = parsed['data']
    @meta = parsed['meta']
    @errors = parsed['meta']['errors']
  end
end