Question

First off, I’m following the practice found here for Rails concerns (great idea!): https://gist.github.com/1014971

I’m getting an error though:

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

I DO have my /app/models/concerns/ directory loaded in /config/application.rb. So the “concern” modules ARE being loaded. Just wanted to point that out.

Here is my code:

/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

Well, with a little more toying around I figured out what is wrong!

When you’re wanting to directly modify the Model from within the Module (concern), you need to wrap the functionality inside an included block.

I’ve changed my concern module to the following:

    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

That is it! Hopefully this will help someone else with the same quesion!