Implement Serializer's scope

lib/active_model/serializer.rb

@@ -31,8 +31,9 @@ module ActiveModel
       @object = object
       @root   = options[:root] || self.class._root
       @root   = self.class.root_name if @root == true
+      @scope  = options[:scope]
     end
-    attr_accessor :object, :root
+    attr_accessor :object, :root, :scope
 
     alias read_attribute_for_serialization send
 

test/serializer/scope_test.rb

@@ -0,0 +1,35 @@
+require 'newbase/test_helper'
+require 'newbase/active_model/serializer'
+
+module SerializerTest
+  module Scope
+    class Model
+      def initialize(hash={})
+        @attributes = hash
+      end
+
+      def read_attribute_for_serialization(name)
+        @attributes[name]
+      end
+    end
+
+    class ModelSerializer < ActiveModel::Serializer
+    end
+
+    class Test < ActiveModel::TestCase
+      def setup
+        @serializer = ModelSerializer.new(nil, scope: current_user)
+      end
+
+      def test_scope
+        assert_equal('user', @serializer.scope)
+      end
+
+      private
+
+      def current_user
+        'user'
+      end
+    end
+  end
+end