Implement ArraySerializer and move old serialization API to a new namespace.

The following constants were renamed:

  ActiveModel::Serialization     => ActiveModel::Serializable
  ActiveModel::Serializers::JSON => ActiveModel::Serializable::JSON
  ActiveModel::Serializers::Xml  => ActiveModel::Serializable::XML

The main motivation for such a change is that `ActiveModel::Serializers::JSON`
was not actually a serializer, but a module that when included allows the target to be serializable to JSON.

With such changes, we were able to clean up the namespace to add true serializers as the ArraySerializer.

1 files changed, 3 insertions, 1 deletions

diff --git a/activemodel/lib/active_model.rb b/activemodel/lib/active_model.rb
index 28765b00bb..6c4fb44b0f 100644
--- a/activemodel/lib/active_model.rb
+++ b/activemodel/lib/active_model.rb
@@ -29,6 +29,7 @@ require 'active_model/version'
 module ActiveModel
   extend ActiveSupport::Autoload
 
+  autoload :ArraySerializer, 'active_model/serializer'
   autoload :AttributeMethods
   autoload :BlockValidator, 'active_model/validator'
   autoload :Callbacks
@@ -43,8 +44,9 @@ module ActiveModel
   autoload :Observer, 'active_model/observing'
   autoload :Observing
   autoload :SecurePassword
-  autoload :Serializer
+  autoload :Serializable
   autoload :Serialization
+  autoload :Serializer
   autoload :TestCase
   autoload :Translation
   autoload :Validations