No Method Error while using modules in Rails Controllers

gistfile1.rb

#lib/time_filter.rb
module TimeFilter
  def today
    where("created_at >= ?", Date.today)
  end
end

# In Rails Console

>> include TimeFilter
>> Person.find(1).articles.today
>> [#article....]

# Successfully returns articles
---------------------------------------
#In my controller

class ArticlesController < ApplicationController
  include TimeFilter
  def filter_by_today
    @articles = Person.find(1).articles.today
  end  
end

#RETURNS ERROR
#NoMethodError in ArticlesController#filter_by_today
#undefined method `today' for #<Class:0xb65b2b54>