ruby-on-rails - Rails 3 模型关注模块

Question

首先，我遵循此处针对 Rails 问题找到的做法(好主意!):https://gist.github.com/1014971

但是我收到错误:

undefined method `search' for #<Class:0x5c25ea0>
app/controllers/accessories_controller.rb:6:in `index'

我确实将我的/app/models/concerns/目录加载到/config/application.rb中。所以“关注”模块正在加载。只是想指出这一点。

这是我的代码:

/app/models/concerns/searchable.rb

module Searchable
  extend ActiveSupport::Concern

  # Add a "search" scope to the models
  def self.search (search)
    if search
      where('name LIKE ?', "%#{search}%")
    else
      scoped
    end
  end
end

/app/models/accessory.rb

class Accessory < ActiveRecord::Base
  include Searchable

  ...
end

/app/controllers/accessories_controller.rb

class AccessoriesController < ApplicationController

  def index
    @accessories  = Accessory.search(params[:search])

    ...
  end

end

Answer 1

好吧，经过一番尝试，我发现了问题所在!

当您想要直接从模块(关注点)内修改模型时，您需要将功能包装在 included block 中。

我已将我的关注模块更改为以下内容:

    module Searchable
        extend ActiveSupport::Concern

        included do
            # Add a "search" scope to the models
            def self.search (search)
                if search
                    where('name LIKE ?', "%#{search}%")
                else
                    scoped
                end
            end
        end

    end

就是这样!希望这能帮助其他有同样问题的人!