move ArraySerializer to separate file

lib/active_model/array_serializer.rb

@@ -0,0 +1,58 @@
+require "active_support/core_ext/class/attribute"
+
+module ActiveModel
+  # Active Model Array Serializer
+  #
+  # It serializes an Array, checking if each element that implements
+  # the +active_model_serializer+ method.
+  #
+  # To disable serialization of root elements:
+  #
+  #     ActiveModel::ArraySerializer.root = false
+  #
+  class ArraySerializer
+    attr_reader :object, :options
+
+    class_attribute :root
+
+    def initialize(object, options={})
+      @object, @options = object, options
+    end
+
+    def serializable_array
+      @object.map do |item|
+        if @options.has_key? :each_serializer
+          serializer = @options[:each_serializer]
+        elsif item.respond_to?(:active_model_serializer)
+          serializer = item.active_model_serializer
+        end
+
+        if serializer
+          serializer.new(item, @options)
+        else
+          item
+        end
+      end
+    end
+
+    def as_json(*args)
+      @options[:hash] = hash = {}
+      @options[:unique_values] = {}
+
+      array = serializable_array.map do |item|
+        if item.respond_to?(:serializable_hash)
+          item.serializable_hash
+        else
+          item.as_json
+        end
+      end
+
+      if root = @options[:root]
+        hash.merge!(root => array)
+      else
+        array
+      end
+    end
+  end
+
+end

lib/active_model/serializer.rb

@@ -27,60 +27,6 @@ module ActiveModel
     end
   end
 
-  # Active Model Array Serializer
-  #
-  # It serializes an Array, checking if each element that implements
-  # the +active_model_serializer+ method.
-  #
-  # To disable serialization of root elements:
-  #
-  #     ActiveModel::ArraySerializer.root = false
-  #
-  class ArraySerializer
-    attr_reader :object, :options
-
-    class_attribute :root
-
-    def initialize(object, options={})
-      @object, @options = object, options
-    end
-
-    def serializable_array
-      @object.map do |item|
-        if @options.has_key? :each_serializer
-          serializer = @options[:each_serializer]
-        elsif item.respond_to?(:active_model_serializer)
-          serializer = item.active_model_serializer
-        end
-
-        if serializer
-          serializer.new(item, @options)
-        else
-          item
-        end
-      end
-    end
-
-    def as_json(*args)
-      @options[:hash] = hash = {}
-      @options[:unique_values] = {}
-
-      array = serializable_array.map do |item|
-        if item.respond_to?(:serializable_hash)
-          item.serializable_hash
-        else
-          item.as_json
-        end
-      end
-
-      if root = @options[:root]
-        hash.merge!(root => array)
-      else
-        array
-      end
-    end
-  end
-
   # Active Model Serializer
   #
   # Provides a basic serializer implementation that allows you to easily

lib/active_model_serializers.rb

@@ -2,6 +2,7 @@ require "active_support"
 require "active_support/core_ext/string/inflections"
 require "active_support/notifications"
 require "active_model"
+require "active_model/array_serializer"
 require "active_model/serializer"
 require "set"