ruby - 如何覆盖 Ruby DataMapper 的 create 和 first_or_create 方法？

Question

我可以覆盖 DataMapper 的保存、删除、销毁！使用模块的方法，例如：

require 'data_mapper'

module Record
  def self.included(base)
    base.class_eval do
      include DataMapper::Resource
      property :id, DataMapper::Property::Serial
      alias :parent_save :save
      def save bar 
        # do additional thing with bar
      end
    end
  end
end

class User
  include Record
  property :name,String
end

DataMapper.finalize

# so i could call something like this:
x = User.new
x.name = 'something'
x.save 123 

如何覆盖create和first_or_create方法，当这些方法找不到时base.class_eval do？

所以我可以这样称呼：

User.first_or_create additional_param, name: 'something'

Answer 1

您可以通过将其添加到您的class_eval块来覆盖类方法：

class << self
  alias :parent_first_or_create, :first_or_create
  def first_or_create
    # ...
  end

  # do other things with class methods
end