ruby-on-rails – 重新分配ActiveRecord实例和相应的外键

概述在Rails / ActiveReocrd中有一种方法可以将一个实例替换为另一个实例,以便解决所有关系/外键. 我可以想象这样的事情： //setupcustomer1 = Customer.find(1)customer2 = Customer.find(2)//this would be coolcustomer1.replace_with(customer2) 假设customer 在Rails / ActiveReocrd中有一种方法可以将一个实例替换为另一个实例,以便解决所有关系/外键.

我可以想象这样的事情：

//setupcustomer1 = Customer.find(1)customer2 = Customer.find(2)//this would be coolcustomer1.replace_with(customer2)

假设customer1配置错误并且有人已经离开并创建了customer2,而不知道customer1那么能够快速将所有内容设置为客户2会很好

所以,这也需要更新任何外键

用户belongs_to：客户
   网站belongs_to：客户

然后任何具有外键customer_ID = 1的用户/网站将通过此’replace_with’方法自动设置为2

这样的事情存在吗？

[我可以想象一个涉及Customer.reflect_on_all_associations(：has_many)等的黑客攻击]

干杯,
Ĵ

解决方法 像这样的东西可以工作,虽然可能有更合适的方式：

更新：更正了关联示例中的一些错误.

class MyModel < ActiveRecord::Base  ...  # if needed,force logout / expire session in controller beforehand.  def replace_with (another_record)    # handles attributes and belongs_to associations    attribute_hash = another_record.attributes    attribute_hash.delete('ID')    self.update_attributes!(attribute_hash)    ### Begin association example,not complete.    # generic way of finding model constants    find_model_proc = Proc.new{ |x| x.to_s.singularize.camelize.constantize }    model_constant = find_model_proc.call(self.class.name)    # handle :has_one,:has_many associations    have_ones = model_constant.reflect_on_all_associations(:has_one).find_all{|i| !i.options.include?(:through)}    have_manys = model_constant.reflect_on_all_associations(:has_many).find_all{|i| !i.options.include?(:through)}    update_assoc_proc = Proc.new do |assoc,associated_record,ID|      primary_key = assoc.primary_key_name.to_sym      attribs = associated_record.attributes      attribs[primary_key] = self.ID      associated_record.update_attributes!(attribs)    end    have_ones.each do |assoc|      associated_record = self.send(assoc.name)      unless associated_record.nil?        update_assoc_proc.call(assoc,self.ID)      end    end    have_manys.each do |assoc|      associated_records = self.send(assoc.name)      associated_records.each do |associated_record|        update_assoc_proc.call(assoc,self.ID)      end    end    ### End association example,not complete.    # and if desired..    # do not call :destroy if you have any associations set with :dependents => :destroy    another_record.destroy  end  ...end

我已经列举了一个如何处理一些关联的例子,但总的来说这可能变得棘手.

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