dynamic_attr_accessor.rb

class DynamicAttrAccessor
  def initialize(hash)
    hash.each do |k,v|
      if v.is_a?(Hash)
        set_attr_accessor(k.to_s, self.class.new(v))
      else
        set_attr_accessor(k.to_s, v)
      end
    end
  end
 
  private
 
  def set_attr_accessor(k,v)
    singleton_class.class_eval do; attr_accessor k.to_s ; end
    send("#{k}=", v)
  end
end
 
# Here is an example
 
hash = {:p => 1, :q => 2, :r => {:s => 3, :t => 4}}
dynamic_attr_accessor = DynamicAttrAccessor.new(hash)
# => #<DynamicAttrAccessor:0x9392548 @p=1, @q=2, @r=#<DynamicAttrAccessor:0x939232c @s=3, @t=4>>
dynamic_attr_accessor.p
# => 1
dynamic_attr_accessor.r
# => #<DynamicAttrAccessor:0x939232c @s=3, @t=4>
dynamic_attr_accessor.r.t
# => 4