将其他属性添加到ActiveRecord序列化？

class User< ActiveRecord::Base
  attr_accessor :custom_attribute
end

class User< ActiveRecord::Base
  serialize :custom_attribute, Hash
end

class User< ActiveRecord::Base
  serialize :custom_attribute, Hash

  def custom_attribute
    self[:custom_attribute] ||= {}
  end

  def custom_attribute=(value)
    self[:custom_attribute] = value
  end
end

user = User.new
user.custom_attribute[:name] = "John"
user.custom_attribute[:age] = 30
user.save

user = User.find(1)
puts user.custom_attribute[:name] # 输出 "John"
puts user.custom_attribute[:age] # 输出 30