diff --git a/activemodel/lib/active_model/naming.rb b/activemodel/lib/active_model/naming.rb
index a860388baeb35affa3f8c24ab081d724d2ade348..8cdd3d2fe823575a1374bf61e1d9c24112c563cf 100644
--- a/activemodel/lib/active_model/naming.rb
+++ b/activemodel/lib/active_model/naming.rb
@@ -3,36 +3,18 @@
 module ActiveModel
 
   class Name < String
-    attr_reader :singular, :plural, :element
+    attr_reader :singular, :plural, :element, :collection, :partial_path
+    alias_method :cache_key, :collection
 
     def initialize(klass)
       super(klass.name)
       @klass = klass
       @singular = ActiveSupport::Inflector.underscore(self).tr('/', '_').freeze
       @plural = ActiveSupport::Inflector.pluralize(@singular).freeze
-      @collection = nil
-      self.element = ActiveSupport::Inflector.underscore(ActiveSupport::Inflector.demodulize(self)).freeze
-    end
-
-    def element=(element)
-      @element = element
+      @element = ActiveSupport::Inflector.underscore(ActiveSupport::Inflector.demodulize(self)).freeze
       @human = ActiveSupport::Inflector.humanize(@element).freeze
-      @default_collection = nil
-      @partial_path = nil
-    end
-
-    def collection
-      @collection || default_collection
-    end
-    alias_method :cache_key, :collection
-
-    def collection=(collection)
-      @collection = collection
-      @partial_path = nil
-    end
-
-    def partial_path
-      @partial_path ||= "#{collection}/#{@element}"
+      @collection = ActiveSupport::Inflector.tableize(self).freeze
+      @partial_path = "#{@collection}/#{@element}".freeze
     end
 
     # Transform the model name into a more humane format, using I18n. By default,
@@ -52,12 +34,6 @@ def human(options={})
       options.reverse_merge! :scope => [@klass.i18n_scope, :models], :count => 1, :default => defaults
       I18n.translate(defaults.shift, options)
     end
-
-    private
-
-      def default_collection
-        @default_collection ||= ActiveSupport::Inflector.tableize(self.sub(/[^:]*$/, @element)).freeze
-      end
   end
 
   # ActiveModel::Naming is a module that creates a +model_name+ method on your
diff --git a/activemodel/test/cases/naming_test.rb b/activemodel/test/cases/naming_test.rb
index 39180023608a24eb7d9d589d8ef656cfdc2b297b..dc39b84ed8cb2822370f57e38430fc795168cc2e 100644
--- a/activemodel/test/cases/naming_test.rb
+++ b/activemodel/test/cases/naming_test.rb
@@ -18,26 +18,6 @@ def test_element
     assert_equal 'track_back', @model_name.element
   end
 
-  def test_set_element
-    @model_name.element = 'foo'
-
-    assert_equal 'foo', @model_name.element
-    assert_equal 'Foo', @model_name.human
-    assert_equal 'post/foos', @model_name.collection
-    assert_equal 'post/foos/foo', @model_name.partial_path
-  end
-
-  def test_human
-    assert_equal 'Track back', @model_name.human
-  end
-
-  def test_set_collection
-    @model_name.collection = 'foo'
-
-    assert_equal 'foo', @model_name.collection
-    assert_equal 'foo/track_back', @model_name.partial_path
-  end
-
   def test_collection
     assert_equal 'post/track_backs', @model_name.collection
   end
@@ -45,14 +25,4 @@ def test_collection
   def test_partial_path
     assert_equal 'post/track_backs/track_back', @model_name.partial_path
   end
-
-  def test_should_preserve_custom_collection
-    @model_name.collection = 'bar'
-    @model_name.element = 'foo'
-
-    assert_equal 'foo', @model_name.element
-    assert_equal 'Foo', @model_name.human
-    assert_equal 'bar', @model_name.collection
-    assert_equal 'bar/foo', @model_name.partial_path
-  end
 end