Limpiar TextArea en Rails 3

clean_description.rake

require File.expand_path(File.dirname(__FILE__) + "/../sanitize_tinymce_text")
include SanitizeTinymceText 

namespace :html do
  desc "Limpiar descripciones guarrillas con css inline y spans"  
  task :clean => :environment do 
    
    Publication.all.each do |pub|
      pub.abstract = sanitize_text(pub.abstract)
      pub.save
    end
    
    Project.all.each do |project|
      project.description = sanitize_text(project.description)
      project.save
    end
                                                         
    Course.all.each do |course|
      course.description = sanitize_text(course.description)
      course.save
    end

    Profile.all.each do |profile|
      profile.research_interest = sanitize_text(profile.research_interest)
      profile.save
    end    
    
  end            
end  

list.html

<%= content_tag(
    :p,
    truncate(
        strip_tags(@publication.abstract),
        :length => 200, 
        :omission => "&nbsp;&hellip;").html_safe) unless publication.abstract.blank? 
%>   

<!-- 
Asi corto las descripciones y les quito el HTML
-->

publication.rb

# En los modelos
class Publication < ActiveRecord::Base       
  include SanitizeTinymceText      

  before_save :clean_abstract   

  def clean_abstract    
    self.abstract = sanitize_text(self.abstract)  
  end     
end

sanitize_tinymce_text.rb

# lib/sanitize_tinymce_text.rb
module SanitizeTinymceText  
  def sanitize_text(input_text)    
    unless input_text.blank?
      begin  
        output_text = ActionController::Base.helpers.sanitize input_text, :tags => %w(b i em a br strong p), :attributes => %w(href)            
      rescue  
        output_text = input_text
      end    
    else
      output_text = input_text       
    end      
  end   
end