Merge pull request rails#6682 from acapilleri/dup_validation_fix_back…

…port_for_1_9_3

Dup validation fix backport for 1 9 3

activemodel/lib/active_model/validations.rb

@@ -168,8 +168,9 @@ def inherited(base)
     # Clean the +Errors+ object if instance is duped
     def initialize_dup(other) # :nodoc:
       @errors = nil
+      super if defined?(super)
     end
-    
+
     # Backport dup from 1.9 so that #initialize_dup gets called
     unless Object.respond_to?(:initialize_dup)
       def dup # :nodoc:

activemodel/test/cases/validations_test.rb

@@ -5,6 +5,7 @@
 require 'models/reply'
 require 'models/custom_reader'
 require 'models/automobile'
+require 'models/book'
 
 require 'active_support/json'
 require 'active_support/xml_mini'
@@ -354,4 +355,14 @@ def test_dup_validity_is_independent
     assert topic.invalid?
     assert duped.valid?
   end
+
+  def test_dup_call_parent_dup_when_include_validations
+    book = Book.new
+    book['title'] = "Litterature"
+    book['author'] = "Foo"
+    duped = book.dup
+
+    assert_equal book.keys, duped.keys
+    assert_equal book.values, duped.values
+  end
 end

activemodel/test/models/book.rb

@@ -0,0 +1,3 @@
+class Book < Hash
+  include ActiveModel::Validations
+end