Add an unrate method to remove all ratings

Fixes #81

Signed-off-by: David Celis <me@davidcel.is>

Author: davidcelis

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    recommendable (2.1.0.2)
+    recommendable (2.1.1)
       activesupport (>= 3.0.0)
       hooks (>= 0.2.1)
       redis (>= 2.2.0)

lib/recommendable/rater.rb

@@ -113,6 +113,11 @@ def rated?(obj)
           def rated_anything?
             likes_count > 0 || dislikes_count > 0
           end
+
+          def unrate(obj)
+            unlike(obj) || undislike(obj) || unhide(obj)
+            unbookmark(obj)
+          end
         end
       end
     end

test/recommendable/rater_test.rb

@@ -23,6 +23,17 @@ def test_that_rated_anything_is_false_by_default
     refute @user.rated_anything?
   end
 
+  def test_that_unrate_removes_any_rating
+    @movie = Factory(:movie)
+    %w[like dislike hide bookmark].each do |action|
+      @user.send(action, @movie)
+      assert @user.send("#{action.pluralize}?", @movie)
+
+      @user.unrate(@movie)
+      refute @user.send("#{action.pluralize}?", @movie)
+    end
+  end
+
   def teardown
     Recommendable.redis.flushdb
   end