rails serialize column in json

json_column.rb

class JsonColumn
  def self.default_with(&block)
    new(block)
  end

  def initialize(default)
    @default = default
  end

  def dump(obj)
    MultiJson.dump(obj)
  end

  def load(json)
    return @default.call if json.nil?
    MultiJson.load(json)
  end
end

user.rb

class User < ActiveRecord::Base
  serialize :detail, JsonColumn.default_with { Hash.new }
  store_accessor :detail, :info, :birthday, :sex
end