A simple mention able model

gistfile1.txt

class Post < ActiveRecord::Base
..

def content_for_view
  content.html_safe
end

before_save :create_mentionable_links_in_post

def create_mentionable_links_in_post
  reg = %r[@\S+]i
  tmp_content = content
  tmp_content.scan( reg ).each do |mention|
    user = User.find_by_user_name( mention.gsub("@","") )
    if user
      tmp_content.gsub( mention, mention_tag( user ) )
    end
  end
  self.content = tmp_content
end

private
def mention_tag( user )
  "<a href='/users/#{user.id}'>@#{user.user_name}</a>"
end

..
end