Add ArraySerializer#object like Serializer

lib/active_model/serializer/adapter/json_api.rb

@@ -163,19 +163,21 @@ module ActiveModel
 
         def add_links(options)
           links = @hash.fetch(:links) { {} }
-          resources = serializer.instance_variable_get(:@resource)
-          @hash[:links] = add_pagination_links(links, resources, options) if is_paginated?(resources)
+          collection = serializer.object
+          if is_paginated?(collection)
+            @hash[:links] = add_pagination_links(links, collection, options)
+          end
         end
 
-        def add_pagination_links(links, resources, options)
-          pagination_links = JsonApi::PaginationLinks.new(resources, options[:context]).serializable_hash(options)
+        def add_pagination_links(links, collection, options)
+          pagination_links = JsonApi::PaginationLinks.new(collection, options[:context]).serializable_hash(options)
           links.update(pagination_links)
         end
 
-        def is_paginated?(resource)
-          resource.respond_to?(:current_page) &&
-            resource.respond_to?(:total_pages) &&
-            resource.respond_to?(:size)
+        def is_paginated?(collection)
+          collection.respond_to?(:current_page) &&
+            collection.respond_to?(:total_pages) &&
+            collection.respond_to?(:size)
         end
       end
     end

lib/active_model/serializer/array_serializer.rb

@@ -3,23 +3,22 @@ module ActiveModel
     class ArraySerializer
       NoSerializerError = Class.new(StandardError)
       include Enumerable
-      delegate :each, to: :@objects
+      delegate :each, to: :@serializers
 
-      attr_reader :root, :meta, :meta_key
+      attr_reader :object, :root, :meta, :meta_key
 
-      def initialize(objects, options = {})
+      def initialize(resources, options = {})
         @root = options[:root]
-        @resource = objects
-        @objects  = objects.map do |object|
-          serializer_class = options.fetch(
-            :serializer,
-            ActiveModel::Serializer.serializer_for(object)
-          )
+        @object = resources
+        @serializers = resources.map do |resource|
+          serializer_class = options.fetch(:serializer) {
+            ActiveModel::Serializer.serializer_for(resource)
+          }
 
           if serializer_class.nil?
-            fail NoSerializerError, "No serializer found for object: #{object.inspect}"
+            fail NoSerializerError, "No serializer found for resource: #{resource.inspect}"
           else
-            serializer_class.new(object, options.except(:serializer))
+            serializer_class.new(resource, options.except(:serializer))
           end
         end
         @meta     = options[:meta]
@@ -27,7 +26,7 @@ module ActiveModel
       end
 
       def json_key
-        key = root || @objects.first.try(:json_key) || @resource.try(:name).try(:underscore)
+        key = root || @serializers.first.try(:json_key) || object.try(:name).try(:underscore)
         key.try(:pluralize)
       end
     end

test/array_serializer_test.rb

@@ -15,6 +15,10 @@ module ActiveModel
         resource
       end
 
+      def test_has_object_reader_serializer_interface
+        assert_equal @serializer.object, @resource
+      end
+
       def test_respond_to_each
         assert_respond_to @serializer, :each
       end