ActiveRecord :: Base不属于从ActiveRecord降序的层次结构

Question

我正在尝试创建一个Rails插件.在大多数情况下,我所写的作品.然而,关联存在问题.当我尝试调用关联时,我收到此错误:

ActiveRecord::Base doesn't belong in a hierarchy descending from ActiveRecord

目前,插件看起来像这样:

module ControlledVersioning
  module ActsAsVersionable
    extend ActiveSupport::Concern

    included do
      has_many :versions, as: :versionable

      after_create :create_initial_version
    end

    module ClassMethods
      def acts_as_versionable(options = {})

        cattr_accessor :versionable_attributes
        self.versionable_attributes = options[:versionable_attributes]
      end
    end

    private
    def create_initial_version
      version = versions.create
    end
  end
end

ActiveRecord::Base.send :include, ControlledVersioning::ActsAsVersionable

同样,每当我尝试调用关联时,都会触发错误消息.我在after_create回调中使用了调试器并尝试运行:

> versions.create
*** ActiveRecord::Base doesn't belong in a hierarchy descending from ActiveRecord

> versions
*** ActiveRecord::Base doesn't belong in a hierarchy descending from ActiveRecord

> Version.new
#<Version id: nil, versionable_id: nil, versionable_type: nil>

Answer 1

我会尝试在初始化程序中扩展活动记录而不是包含它。

初始化器/acts_as_versionable.rb ActiveRecord::Base.extend(ControlledVersioning::ActsAsVersionable)

也在开发中；或任何重新加载文件的环境，您可能会看到类似的错误has been removed from the module tree but is still active。确保您的插件文件位于 config.eager_load_paths 中，而不是实际位于关注路径中。