2 files changed, 40 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/attribute_assignment.rb b/activerecord/lib/active_record/attribute_assignment.rb
index b36c90fc08..df4de8ac35 100644
--- a/activerecord/lib/active_record/attribute_assignment.rb
+++ b/activerecord/lib/active_record/attribute_assignment.rb
@@ -2,7 +2,7 @@ require 'active_support/concern'
 
 module ActiveRecord
   ActiveSupport.on_load(:active_record_config) do
-    mattr_accessor :whitelist_attributes, instance_accessor: false
+    mattr_accessor :whitelist_attributes,      instance_accessor: false
     mattr_accessor :mass_assignment_sanitizer, instance_accessor: false
   end
 
@@ -11,12 +11,12 @@ module ActiveRecord
     include ActiveModel::MassAssignmentSecurity
 
     included do
-      attr_accessible(nil) if Model.whitelist_attributes
+      initialize_mass_assignment_sanitizer
     end
 
     module ClassMethods
       def inherited(child) # :nodoc:
-        child.attr_accessible(nil) if Model.whitelist_attributes
+        child.send :initialize_mass_assignment_sanitizer if self == Base
         super
       end
 
@@ -28,6 +28,11 @@ module ActiveRecord
         default << 'id' unless primary_key.eql? 'id'
         default
       end
+
+      def initialize_mass_assignment_sanitizer
+        attr_accessible(nil) if Model.whitelist_attributes
+        self.mass_assignment_sanitizer = Model.mass_assignment_sanitizer if Model.mass_assignment_sanitizer
+      end
     end
 
     # Allows you to set all the attributes at once by passing in a hash with keys
diff --git a/activerecord/test/cases/mass_assignment_security_test.rb b/activerecord/test/cases/mass_assignment_security_test.rb
index c75a0be98e..73a01906b9 100644
--- a/activerecord/test/cases/mass_assignment_security_test.rb
+++ b/activerecord/test/cases/mass_assignment_security_test.rb
@@ -278,6 +278,38 @@ class MassAssignmentSecurityTest < ActiveRecord::TestCase
       ActiveRecord::Model.whitelist_attributes = prev
     end
   end
+
+  test "ActiveRecord::Model.mass_assignment_sanitizer works for models which include Model" do
+    begin
+      sanitizer = Object.new
+      prev, ActiveRecord::Model.mass_assignment_sanitizer = ActiveRecord::Model.mass_assignment_sanitizer, sanitizer
+
+      klass = Class.new { include ActiveRecord::Model }
+      assert_equal sanitizer, klass._mass_assignment_sanitizer
+
+      ActiveRecord::Model.mass_assignment_sanitizer = nil
+      klass = Class.new { include ActiveRecord::Model }
+      assert_not_nil klass._mass_assignment_sanitizer
+    ensure
+      ActiveRecord::Model.mass_assignment_sanitizer = prev
+    end
+  end
+
+  test "ActiveRecord::Model.mass_assignment_sanitizer works for models which inherit Base" do
+    begin
+      sanitizer = Object.new
+      prev, ActiveRecord::Model.mass_assignment_sanitizer = ActiveRecord::Model.mass_assignment_sanitizer, sanitizer
+
+      klass = Class.new(ActiveRecord::Base)
+      assert_equal sanitizer, klass._mass_assignment_sanitizer
+
+      sanitizer2 = Object.new
+      klass.mass_assignment_sanitizer = sanitizer2
+      assert_equal sanitizer2, Class.new(klass)._mass_assignment_sanitizer
+    ensure
+      ActiveRecord::Model.mass_assignment_sanitizer = prev
+    end
+  end
 end