4 files changed, 20 insertions, 7 deletions
diff --git a/activemodel/lib/active_model.rb b/activemodel/lib/active_model.rb
index 2586147a20..ded1b752df 100644
--- a/activemodel/lib/active_model.rb
+++ b/activemodel/lib/active_model.rb
@@ -21,8 +21,6 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #++
 
-activesupport_path = File.expand_path('../../../activesupport/lib', __FILE__)
-$:.unshift(activesupport_path) if File.directory?(activesupport_path) && !$:.include?(activesupport_path)
 require 'active_support'
 require 'active_model/version'
 
@@ -59,5 +57,6 @@ module ActiveModel
   end
 end
 
-require 'active_support/i18n'
-I18n.load_path << File.dirname(__FILE__) + '/active_model/locale/en.yml'
+ActiveSupport.on_load(:i18n) do
+  I18n.load_path << File.dirname(__FILE__) + '/active_model/locale/en.yml'
+end
diff --git a/activemodel/lib/active_model/attribute_methods.rb b/activemodel/lib/active_model/attribute_methods.rb
index 97a83e58af..25d5d84ce6 100644
--- a/activemodel/lib/active_model/attribute_methods.rb
+++ b/activemodel/lib/active_model/attribute_methods.rb
@@ -180,6 +180,18 @@ module ActiveModel
         undefine_attribute_methods
       end
 
+
+      # Allows you to make aliases for attributes.
+      #
+      #   class Person
+      #     attr_accessor :name
+      #     alias_attribute :nickname, :name
+      #   end
+      #
+      #   person = Person.new
+      #   person.nickname = "Bob"
+      #   person.nickname # => "Bob"
+      #   person.name     # => "Bob"
       def alias_attribute(new_name, old_name)
         attribute_method_matchers.each do |matcher|
           matcher_new = matcher.method_name(new_name).to_s
diff --git a/activemodel/lib/active_model/serialization.rb b/activemodel/lib/active_model/serialization.rb
index 4403ef060b..00cd05b7ef 100644
--- a/activemodel/lib/active_model/serialization.rb
+++ b/activemodel/lib/active_model/serialization.rb
@@ -87,8 +87,8 @@ module ActiveModel
       Array(options[:methods]).each { |m| hash[m.to_s] = send(m) if respond_to?(m) }
 
       serializable_add_includes(options) do |association, records, opts|
-        hash[association.to_s] = if records.is_a?(Enumerable)
-          records.map { |a| a.serializable_hash(opts) }
+        hash[association.to_s] = if records.respond_to?(:to_ary)
+          records.to_ary.map { |a| a.serializable_hash(opts) }
         else
           records.serializable_hash(opts)
         end
diff --git a/activemodel/lib/active_model/serializers/xml.rb b/activemodel/lib/active_model/serializers/xml.rb
index 5084298210..b78f1ff3f3 100644
--- a/activemodel/lib/active_model/serializers/xml.rb
+++ b/activemodel/lib/active_model/serializers/xml.rb
@@ -115,7 +115,9 @@ module ActiveModel
           merged_options = opts.merge(options.slice(:builder, :indent))
           merged_options[:skip_instruct] = true
 
-          if records.is_a?(Enumerable)
+          if records.respond_to?(:to_ary)
+            records = records.to_ary
+
             tag  = ActiveSupport::XmlMini.rename_key(association.to_s, options)
             type = options[:skip_types] ? { } : {:type => "array"}
             association_name = association.to_s.singularize