validation_call_count.patch

diff --git a/activerecord/test/cases/associations/has_many_through_associations_test.rb b/activerecord/test/cases/associations/has_many_through_associations_test.rb
index af91fb2..f3e4d10 100644
--- a/activerecord/test/cases/associations/has_many_through_associations_test.rb
+++ b/activerecord/test/cases/associations/has_many_through_associations_test.rb
@@ -894,4 +894,11 @@ class HasManyThroughAssociationsTest < ActiveRecord::TestCase
     end
   end
 
+  def test_validation_call_counter_on_join_records
+    author = Author.create(:name => "tenderlove")
+    Categorization.any_instance.expects(:check_validation_call_count).times(1)
+    category = Category.new(:name => "rails 4.0")
+    category.authors << author
+    category.save
+  end
 end
diff --git a/activerecord/test/models/author.rb b/activerecord/test/models/author.rb
index 6935cfb..bd7fd86 100644
--- a/activerecord/test/models/author.rb
+++ b/activerecord/test/models/author.rb
@@ -181,6 +181,8 @@ class Author < ActiveRecord::Base
     def raise_exception(object)
       raise Exception.new("You can't add a post")
     end
+
+
 end
 
 class AuthorAddress < ActiveRecord::Base
diff --git a/activerecord/test/models/categorization.rb b/activerecord/test/models/categorization.rb
index 6588531..cad9e15 100644
--- a/activerecord/test/models/categorization.rb
+++ b/activerecord/test/models/categorization.rb
@@ -8,6 +8,13 @@ class Categorization < ActiveRecord::Base
 
   belongs_to :author_using_custom_pk,  :class_name => 'Author', :foreign_key => :author_id, :primary_key => :author_address_extra_id
   has_many   :authors_using_custom_pk, :class_name => 'Author', :foreign_key => :id,        :primary_key => :category_id
+  validate :check_validation_call_count
+
+  private
+  def check_validation_call_count
+    @count ||= 0
+    @count = @count + 1
+  end
 end
 
 class SpecialCategorization < ActiveRecord::Base