class OpenStruct

def to_json(*args)


{"json_class":"OpenStruct","t":{'name':'Rowdy',"age":null}}

Output:

puts OpenStruct.new('name' => 'Rowdy', :age => nil).to_json
require 'json/add/ostruct'

Returns a JSON string representing +self+: 
def to_json(*args)
  as_json.to_json(*args)
end