I was working with Refinery cms  some times back.I want blogging facility to my CMS. Refinery has various engine which can easily plug and play including blogging.

Blog Engine doesn’t facilitate with searching facility default,but it’s easy to add searching facility.

Following Snippet will help you to do this.

# app/models/refinery/blog/post.rb
module Refinery
  module Blog
    class Post < ActiveRecord::Base
      ........
      .......
      class << self
         ......
       # Considering   "refinery" is a prefix so table name is refinery_blog_posts

        def search(search_string="")
          Post.includes(:categories,:tags).live.where(
              "refinery_blog_posts.title like (?) or refinery_blog_posts.body like (?) 
              or refinery_blog_categories.title like (?) or tags.name like (?)",
              "%#{search_string}%","%#{search_string}%","%#{search_string}%","%#{search_string}%")
        end
      end
    end
  end
end

Now if you want you can add search method in controller or you can use index method for this.
Following Snippet will help us to search a blog posts.

# app/controllers/refinery/blog/posts_controller.rb
module Refinery
  module Blog
    class PostsController < BlogController
     .....
      def search
        @posts = Post.search(params[:search]).page(params[:page])
        render "refinery/blog/posts/index"
      end
     ....
    end
  end
end

Now you are ready with Refinery CMS with  Blog engine with Searching facility.

Any tips and tricks and feedback is welcome