Merge pull request #833 from lsylvester/cache-serializers-for-class

Cache serializers for class

lib/active_model/serializer.rb

@@ -1,3 +1,5 @@
+require 'thread_safe'
+
 module ActiveModel
   class Serializer
     extend ActiveSupport::Autoload
@@ -201,11 +203,16 @@ module ActiveModel
       opts
     end
 
+    def self.serializers_cache
+      @serializers_cache ||= ThreadSafe::Cache.new
+    end
+
     private
 
     attr_reader :options
 
     def self.get_serializer_for(klass)
+      serializers_cache.fetch_or_store(klass) do
         serializer_class_name = "#{klass.name}Serializer"
         serializer_class = serializer_class_name.safe_constantize
 
@@ -215,6 +222,7 @@ module ActiveModel
           get_serializer_for(klass.superclass)
         end
       end
+    end
 
   end
 end

lib/active_model_serializers.rb

@@ -9,6 +9,9 @@ begin
 
   ActiveSupport.on_load(:action_controller) do
     include ::ActionController::Serialization
+    ActionDispatch::Reloader.to_prepare do
+      ActiveModel::Serializer.serializers_cache.clear
+    end
   end
 rescue LoadError
   # rails not installed, continuing