Duplicate column_defaults properly

Backport c517602 to fix #6115

Deleted:
    activerecord/lib/active_record/core.rb

Conflicts:
    activerecord/test/cases/base_test.rb

2 files changed, 8 insertions, 1 deletions

diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index b849eead26..97d6c0cf88 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -325,6 +325,12 @@ class BasicsTest < ActiveRecord::TestCase
     assert parrot.valid?
   end
 
+  def test_default_values_are_deeply_dupped
+    company = Company.new
+    company.description << "foo"
+    assert_equal "", Company.new.description
+  end
+
   def test_load
     topics = Topic.find(:all, :order => 'id')
     assert_equal(4, topics.size)
@@ -2148,7 +2154,7 @@ class BasicsTest < ActiveRecord::TestCase
   end
 
   def test_attribute_names
-    assert_equal ["id", "type", "ruby_type", "firm_id", "firm_name", "name", "client_of", "rating", "account_id"],
+    assert_equal ["id", "type", "ruby_type", "firm_id", "firm_name", "name", "client_of", "rating", "account_id", "description"],
                  Company.attribute_names
   end
 
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index 32982e4f82..1ad4d971f4 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -176,6 +176,7 @@ ActiveRecord::Schema.define do
     t.integer :client_of
     t.integer :rating, :default => 1
     t.integer :account_id
+    t.string :description, :null => false, :default => ""
   end
 
   add_index :companies, [:firm_id, :type, :rating, :ruby_type], :name => "company_index"