Implement ArraySerializer

lib/active_model/array_serializer.rb

@@ -0,0 +1,19 @@
+module ActiveModel
+  class ArraySerializer
+    def initialize(object, options={})
+      @object  = object
+      @options = options
+    end
+
+    def serializable_array
+      @object.map do |item|
+        if serializer = Serializer.serializer_for(item)
+          serializer.new(item).serializable_object(@options.merge(root: nil))
+        else
+          item.as_json
+        end
+      end
+    end
+    alias serializable_object serializable_array
+  end
+end

lib/active_model/serializer.rb

@@ -9,8 +9,12 @@ module ActiveModel
       end
 
       def serializer_for(resource)
+        if resource.respond_to?(:to_ary)
+          ArraySerializer
+        else
           "#{resource.class.name}Serializer".safe_constantize
         end
+      end
 
       attr_accessor :_root, :_attributes, :_associations
 
@@ -114,6 +118,7 @@ module ActiveModel
       hash = attributes
       hash.merge! associations
     end
+    alias serializable_object serializable_hash
 
     def as_json(options={})
       if root = options[:root] || self.root

lib/active_model_serializers.rb

@@ -1,5 +1,6 @@
 require 'active_model'
 require 'active_model/serializer'
+require 'active_model/array_serializer'
 
 begin
   require 'action_controller'

test/unit/active_model/array_serializer_test.rb

@@ -0,0 +1,32 @@
+require 'test_helper'
+require 'active_model/serializer'
+
+module ActiveModel
+  class ArraySerializer
+    class Test < ActiveModel::TestCase
+      def setup
+        array = [1, 2, 3]
+        @serializer = ActiveModel::Serializer.serializer_for(array).new(array)
+      end
+
+      def test_serializer_for_array_returns_appropriate_type
+        assert_kind_of ArraySerializer, @serializer
+      end
+
+      def test_array_serializer_serializes_simple_objects
+        assert_equal [1, 2, 3], @serializer.serializable_array
+      end
+
+      def test_array_serializer_serializes_models
+        array = [Profile.new({ name: 'Name 1', description: 'Description 1', comments: 'Comments 1' }),
+                 Profile.new({ name: 'Name 2', description: 'Description 2', comments: 'Comments 2' })]
+        serializer = ArraySerializer.new(array)
+
+        expected = [{'name' => 'Name 1', 'description' => 'Description 1'},
+                    {'name' => 'Name 2', 'description' => 'Description 2'}]
+
+        assert_equal expected, serializer.serializable_array
+      end
+    end
+  end
+end