1 files changed, 46 insertions, 0 deletions
diff --git a/activerecord/test/cases/dirty_test.rb b/activerecord/test/cases/dirty_test.rb
index c011ffaf57..e5e022050d 100644
--- a/activerecord/test/cases/dirty_test.rb
+++ b/activerecord/test/cases/dirty_test.rb
@@ -2,6 +2,7 @@ require 'cases/helper'
 require 'models/topic'    # For booleans
 require 'models/pirate'   # For timestamps
 require 'models/parrot'
+require 'models/person'   # For optimistic locking
 
 class Pirate # Just reopening it, not defining it
   attr_accessor :detected_changes_in_after_update # Boolean for if changes are detected
@@ -54,6 +55,33 @@ class DirtyTest < ActiveRecord::TestCase
     end
   end
 
+  def test_zero_to_blank_marked_as_changed
+    pirate = Pirate.new
+    pirate.catchphrase = "Yarrrr, me hearties"
+    pirate.parrot_id = 1
+    pirate.save
+
+    # check the change from 1 to ''
+    pirate = Pirate.find_by_catchphrase("Yarrrr, me hearties")
+    pirate.parrot_id = ''
+    assert pirate.parrot_id_changed?
+    assert_equal([1, nil], pirate.parrot_id_change)
+    pirate.save
+
+    # check the change from nil to 0
+    pirate = Pirate.find_by_catchphrase("Yarrrr, me hearties")
+    pirate.parrot_id = 0
+    assert pirate.parrot_id_changed?
+    assert_equal([nil, 0], pirate.parrot_id_change)
+    pirate.save
+
+    # check the change from 0 to ''
+    pirate = Pirate.find_by_catchphrase("Yarrrr, me hearties")
+    pirate.parrot_id = ''
+    assert pirate.parrot_id_changed?
+    assert_equal([0, nil], pirate.parrot_id_change)
+  end
+
   def test_object_should_be_changed_if_any_attribute_is_changed
     pirate = Pirate.new
     assert !pirate.changed?
@@ -125,6 +153,24 @@ class DirtyTest < ActiveRecord::TestCase
     end
   end
 
+  def test_partial_update_with_optimistic_locking
+    person = Person.new(:first_name => 'foo')
+    old_lock_version = 1
+
+    with_partial_updates Person, false do
+      assert_queries(2) { 2.times { person.save! } }
+      Person.update_all({ :first_name => 'baz' }, :id => person.id)
+    end
+
+    with_partial_updates Person, true do
+      assert_queries(0) { 2.times { person.save! } }
+      assert_equal old_lock_version, person.reload.lock_version
+
+      assert_queries(1) { person.first_name = 'bar'; person.save! }
+      assert_not_equal old_lock_version, person.reload.lock_version
+    end
+  end
+
   def test_changed_attributes_should_be_preserved_if_save_failure
     pirate = Pirate.new
     pirate.parrot_id = 1