Fix build_association on rails 4.2

CHANGELOG.md

@@ -1,3 +1,9 @@
+## 1.0.9
+
+* Fixes build_association method on rails 4.2.0+
+
+  Fixes https://github.com/rails/rails/issues/18121
+
 ## 1.0.8 (June 16, 2014)
 
 * Support Rails 4.0.6+ and 4.1.2+.

lib/active_record/mass_assignment_security/reflection.rb

@@ -1,8 +1,16 @@
 module ActiveRecord
   module Reflection
-    class AssociationReflection
-      def build_association(*options, &block)
-        klass.new(*options, &block)
+    if defined?(AbstractReflection)
+      class AbstractReflection
+        def build_association(*options, &block)
+          klass.new(*options, &block)
+        end
+      end
+    else
+      class AssociationReflection
+        def build_association(*options, &block)
+          klass.new(*options, &block)
+        end
       end
     end
   end

test/ar_helper.rb

@@ -50,6 +50,7 @@
   end
 
   create_table :pirates, :force => true do |t|
+    t.string :name
   end
 
   create_table :groups, :force => true do |t|

test/attribute_sanitization_test.rb

@@ -682,6 +682,12 @@ def test_has_many_build_with_strict_sanitizer
     end
   end
 
+  def test_has_many_through_build_with_attr_accessible_attributes
+    group = Group.create!
+    pirate = group.members.build(name: "Murphy")
+    assert_equal "Murphy", pirate.name
+  end
+
   # new
 
   def test_has_many_new_with_attr_protected_attributes

test/models/pirate.rb

@@ -1,5 +1,5 @@
 class Pirate < ActiveRecord::Base
   self.mass_assignment_sanitizer = :strict
-
+  attr_accessible :name
   has_many :memberships
 end