diff --git a/README.md b/README.md
index e9d049e..9d64276 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,13 @@ class Car < ActiveRecord::Base
   letsrate_rateable "speed", "engine", "price"
 end
 ```
+Set :can_change option if you want to allow users to change their ratings
+
+```ruby
+class Car < ActiveRecord::Base
+  letsrate_rateable "speed", "engine", "price", :can_change => true
+end
+```
 
 Then you need to add a call letsrate_rater in the user model.
 
@@ -93,6 +100,12 @@ You can use the rating_for_user helper method to show the star rating for the us
 Speed : <%= rating_for_user @car, current_user, "speed", :star => 10 %>
 ```
 
+Use :readonly option if you need only show rating, without ability to set rating
+
+```erb
+Speed : <%= rating_for @car, "speed", :readonly => true %>
+Speed : <%= rating_for_user @car, current_user, "speed", :readonly => true %>
+```
 
 ## Feedback
 If you find bugs please open a ticket at [https://github.com/muratguzel/letsrate/issues](https://github.com/muratguzel/letsrate/issues)
diff --git a/lib/letsrate/helpers.rb b/lib/letsrate/helpers.rb
index c2130a0..5dd8a21 100644
--- a/lib/letsrate/helpers.rb
+++ b/lib/letsrate/helpers.rb
@@ -1,4 +1,8 @@
 module Helpers
+
+  # show rate widget
+  # @options[:readonly] show widget in read only mode
+  # @options[:disable_after_rate] disable widget after rate
   def rating_for(rateable_obj, dimension=nil, options={})
 
     cached_average = rateable_obj.average dimension
@@ -10,6 +14,8 @@ def rating_for(rateable_obj, dimension=nil, options={})
     disable_after_rate = options[:disable_after_rate] || true
 
     readonly = !(current_user && rateable_obj.can_rate?(current_user, dimension))
+    # now we can force readonly attribute
+    readonly = options[:readonly] || readonly unless readonly
 
     content_tag :div, '', "data-dimension" => dimension, :class => "star", "data-rating" => avg,
                 "data-id" => rateable_obj.id, "data-classname" => rateable_obj.class.name,
@@ -18,24 +24,27 @@ def rating_for(rateable_obj, dimension=nil, options={})
                 "data-star-count" => star
   end
 
+  # show rate widget for user
+  # @options[:readonly] show widget in read only mode
+  # @options[:disable_after_rate] disable widget after rate
   def rating_for_user(rateable_obj, rating_user, dimension = nil, options = {})
     @object = rateable_obj
     @user = rating_user
-	  @rating = Rate.find_by_rater_id_and_rateable_id_and_dimension(@user.id, @object.id, dimension)
-	  stars = @rating ? @rating.stars : 0
-
+    @rating = Rate.find_by_rater_id_and_rateable_id_and_dimension(@user.id, @object.id, dimension)
+    stars = @rating ? @rating.stars : 0
+    stars_count = options[:stars_count] || stars
     disable_after_rate = options[:disable_after_rate] || false
 
-    readonly=false
+    readonly= options[:readonly] || false
     if disable_after_rate
-      readonly = current_user.present? ? !rateable_obj.can_rate?(current_user.id, dimension) : true
+      readonly = current_user.present? ? !rateable_obj.can_rate?(current_user, dimension) : true
     end
 
     content_tag :div, '', "data-dimension" => dimension, :class => "star", "data-rating" => stars,
                 "data-id" => rateable_obj.id, "data-classname" => rateable_obj.class.name,
                 "data-disable-after-rate" => disable_after_rate,
                 "data-readonly" => readonly,
-                "data-star-count" => stars
+                "data-star-count" => stars_count
   end
 
 end
diff --git a/lib/letsrate/model.rb b/lib/letsrate/model.rb
index 4ae1e5b..e8f9da0 100644
--- a/lib/letsrate/model.rb
+++ b/lib/letsrate/model.rb
@@ -69,6 +69,10 @@ def can_rate?(user, dimension=nil)
     user.ratings_given.where(dimension: dimension, rateable_id: id, rateable_type: self.class.name).size.zero?
   end
 
+  def has_rate?(user, dimension=nil)
+    user.ratings_given.where(dimension: dimension, rateable_id: id, rateable_type: self.class.name).size.nonzero?
+  end
+
   def rates(dimension=nil)
     dimension ? self.send("#{dimension}_rates") : rates_without_dimension
   end
@@ -84,24 +88,50 @@ def letsrate_rater
     end
 
     def letsrate_rateable(*dimensions)
-      has_many :rates_without_dimension, -> { where dimension: nil}, :as => :rateable, :class_name => "Rate", :dependent => :destroy
+      opts = dimensions.extract_options!
+      has_many :rates_without_dimension, :as => :rateable, :class_name => "Rate", :dependent => :destroy, :conditions => {:dimension => nil}
       has_many :raters_without_dimension, :through => :rates_without_dimension, :source => :rater
 
-      has_one :rate_average_without_dimension, -> { where dimension: nil}, :as => :cacheable,
-              :class_name => "RatingCache", :dependent => :destroy
+      has_one :rate_average_without_dimension, :as => :cacheable, :class_name => "RatingCache",
+              :dependent => :destroy, :conditions => {:dimension => nil}
 
 
       dimensions.each do |dimension|
-        has_many "#{dimension}_rates".to_sym, -> {where dimension: dimension.to_s},
-                                              :dependent => :destroy,
-                                              :class_name => "Rate",
-                                              :as => :rateable
+        has_many "#{dimension}_rates".to_sym, :dependent => :destroy,
+                  :conditions => {:dimension => dimension.to_s},
+                  :class_name => "Rate",
+                  :as => :rateable
 
         has_many "#{dimension}_raters".to_sym, :through => "#{dimension}_rates", :source => :rater
 
-        has_one "#{dimension}_average".to_sym, -> { where dimension: dimension.to_s },
-                                              :as => :cacheable, :class_name => "RatingCache",
-                                              :dependent => :destroy
+        has_one "#{dimension}_average", :as => :cacheable, :class_name => "RatingCache",
+                    :dependent => :destroy, :conditions => {:dimension => dimension.to_s}
+      end
+
+      if opts[:can_change]
+        class_eval <<-RUBY, __FILE__, __LINE__+1
+            def rate(stars, user, dimension=nil, dirichlet_method=false)
+              dimension = nil if dimension.blank?
+
+              if has_rate? user, dimension
+                user.ratings_given.where(dimension: dimension, rateable_id: id, rateable_type: self.class.name).first.update_attribute(:stars,stars)
+              else
+                rates(dimension).create! do |r|
+                  r.stars = stars
+                  r.rater = user
+                end
+              end
+              if dirichlet_method
+                update_rate_average_dirichlet(stars, dimension)
+              else
+                update_rate_average(stars, dimension)
+              end
+            end
+
+            def can_rate?(user, dimension=nil)
+              true
+            end
+        RUBY
       end
     end
   end