ruby-on-rails - rails : TypeError: wrong argument type Class (expected Module)

Question

在 app/models/abc/xyz.rb 里面

module Abc::Xyz
  extend ActiveSupport::Concern
end

在 app/models/abc.rb 里面

class Abc < ActiveRecord::Base
  include Abc::Xyz 
end

当我尝试从 Abc.where(id: id) 获取数据时，有时它会起作用，有时它会返回此错误(TypeError:错误的参数类型类(预期的模块))。

TypeError: wrong argument type Class (expected Module)
      app/models/abc.rb:2:in `include'
      app/models/abc.rb:2:in `<class:Abc>'
      app/models/abc.rb:1:in `<top (required)>'
      activesupport (3.2.17) lib/active_support/dependencies.rb:469:in `load'
      activesupport (3.2.17) lib/active_support/dependencies.rb:469:in `block in load_file'
      activesupport (3.2.17) lib/active_support/dependencies.rb:639:in `new_constants_in'
      activesupport (3.2.17) lib/active_support/dependencies.rb:468:in `load_file'
      activesupport (3.2.17) lib/active_support/dependencies.rb:353:in `require_or_load'
      activesupport (3.2.17) lib/active_support/dependencies.rb:502:in `load_missing_constant'
      activesupport (3.2.17) lib/active_support/dependencies.rb:192:in `block in const_missing'
      activesupport (3.2.17) lib/active_support/dependencies.rb:190:in `each'
      activesupport (3.2.17) lib/active_support/dependencies.rb:190:in `const_missing'
      activesupport (3.2.17) lib/active_support/inflector/methods.rb:230:in `block in constantize'
      activesupport (3.2.17) lib/active_support/inflector/methods.rb:229:in `each'
      activesupport (3.2.17) lib/active_support/inflector/methods.rb:229:in `constantize'
      activesupport (3.2.17) lib/active_support/core_ext/string/inflections.rb:54:in `constantize'

Answer 1

这不是 OPs 问题的正确答案，但我认为它可以帮助人们在搜索错误消息时找到这个问题。
对我来说，问题是我有一个这样定义的助手:

module Api
  class MyControllerHelper
  end
end

但是 Rails 期望 helper 是一个模块而不是一个类，所以它应该是这样的:

module Api
  module MyControllerHelper
  end
end