Ruby on rails Rails：如何暂时禁用对象的持久性？

与中一样，

freeze

禁用更新对象值的功能（在一定程度上）。如何构建一个方法

User.disable_persistence

，该方法将禁用对该对象和关联对象的创建/保存/更新功能，这两个对象都是直接调用（

User.save

）和间接调用（

User.children），您可以在_save

过滤器之前添加一个

，以检查布尔字段的值（比如说
editable
），如果设置为false，它将重定向到根url。在调用
create/save/update
方法之前，该块将结束。
您可以创建事务并抛出异常以回滚任何更改。
问题似乎很简单。但棘手的部分是
和（User.children非常感谢你！我很敬畏！）
class User < ...
  def disable_persistence
    # magic here (nullify save, and other methods, prevent callbacks etc.)
    class_eval :before_save do 
      errors.add(:base, "Persistence has been disabled for this object")
    end
  end
end

module DisablePersistence
  extend ActiveSupport::Concern

  def disable_persistence
    @persistence_disabled = true
  end

  def enable_persistence
    @persistence_disabled = false
  end

  module ClassMethods
    def disable_persistence
      @@class_persistence_disabled = true
    end

    def enable_persistence
      @@class_persistence_disabled = false
    end

    def persistence_disabled?
      @@class_persistence_disabled ||= false
    end

    def persistence_disabled
      persistence_disabled?
    end
  end

  included do
    attr_reader :persistence_disabled
    alias :persistence_disabled? :persistence_disabled

    before_save :can_persist?

    after_initialize do |base|
      base.instance_variable_set(:@persistence_disabled, false)
    end

    def can_persist?
      !persistence_disabled? && !self.class.persistence_disabled?
    end

    protected :can_persist?
  end
end

ActiveRecord::Base.send :include, DisablePersistence

author = Author.new
author.disable_persistence
author.save # will return false and nothing will be saved
author.enable_persistence
author.save # will return true and author will be saved

author = Author.new
author.disable_persistence
book = Book.new
author.books << book
author.save # false and nothing will be saved

author = Author.new
author.save
book = Book.new
book.disable_persistence
author.books << book # nothing will be saved

author = Author.new
author.save
book = Book.new
author.disable_persistence
author.books << book # will be saved indeed, because the book has enabled persistency

author = Author.new
Author.disable_persistence
author.save # will return false and will not save