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 

如果在create上找不到这些方法，如何覆盖first_or_create和base.class_eval do方法？

所以我可以这样说：

User.first_or_create additional_param, name: 'something'

Answer 1

您可以通过将类方法添加到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