activity.json

{
      "Id"=>13730,
      "ActivityId"=>12008,
      "ActivityTypeId"=>4,
      "ActivityTypeName"=>"Lab",
      "ParentId"=>nil,
      "Activities"=>[],
      "Subtitle"=>"Virtual Server Connectivity Check, Module 01 Lab1",
      "Description"=>
       "In this lab you will discover the various components of the Lab On Demand (LOD) interface and learn how to interact with the controls to sucessfully complete your hands-on online labs.",
      "Name"=>"Virtual Server Connectivity Check",
      "AllowRetake"=>true,
      "AllowReview"=>false,
      "Url"=>nil,
      "SortOrder"=>0,
      "Required"=>false,
      "AvailabilityTypeId"=>0,
      "ExpectedDurationSeconds"=>0,
      "IsExam"=>false
}

activity.rb

module LodService
  class Activity
    include ActiveModel::Serializers::JSON

    attr_accessor :id
    attr_accessor :activity_id
    attr_accessor :activity_type_id
    attr_accessor :activity_type_name
    attr_accessor :parent_id
    attr_accessor :activities
    attr_accessor :subtitle
    attr_accessor :description
    attr_accessor :name
    attr_accessor :allow_retake
    attr_accessor :allow_review
    attr_accessor :url
    attr_accessor :sort_order
    attr_accessor :required
    attr_accessor :availability_type_id
    attr_accessor :expected_duration_seconds
    attr_accessor :is_exam

    def attributes=(hash)
      hash.each { |k,v| send("#{k.underscore}=", v) }
    end

    def attributes
      instance_values
    end
  end
end