2 files changed, 14 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/mass_assignment_security/sanitizer.rb b/activemodel/lib/active_model/mass_assignment_security/sanitizer.rb
index bb0526adc3..bbdddfb50d 100644
--- a/activemodel/lib/active_model/mass_assignment_security/sanitizer.rb
+++ b/activemodel/lib/active_model/mass_assignment_security/sanitizer.rb
@@ -44,8 +44,13 @@ module ActiveModel
 
     class StrictSanitizer < Sanitizer
       def process_removed_attributes(attrs)
+        return if (attrs - insensitive_attributes).empty?
         raise ActiveModel::MassAssignmentSecurity::Error, "Can't mass-assign protected attributes: #{attrs.join(', ')}"
       end
+
+      def insensitive_attributes
+        ['id']
+      end
     end
 
     class Error < StandardError
diff --git a/activemodel/test/cases/mass_assignment_security/sanitizer_test.rb b/activemodel/test/cases/mass_assignment_security/sanitizer_test.rb
index 62a6ec9c9b..676937b5e1 100644
--- a/activemodel/test/cases/mass_assignment_security/sanitizer_test.rb
+++ b/activemodel/test/cases/mass_assignment_security/sanitizer_test.rb
@@ -7,7 +7,7 @@ class SanitizerTest < ActiveModel::TestCase
 
   class Authorizer < ActiveModel::MassAssignmentSecurity::PermissionSet
     def deny?(key)
-      key.in?(['admin'])
+      ['admin', 'id'].include?(key)
     end
   end
 
@@ -40,4 +40,12 @@ class SanitizerTest < ActiveModel::TestCase
     end
   end
 
+  test "mass assignment insensitive attributes" do
+    original_attributes = {'id' => 1, 'first_name' => 'allowed'}
+
+    assert_nothing_raised do
+      @strict_sanitizer.sanitize(original_attributes, @authorizer)
+    end
+  end
+
 end