Revert "Merge pull request rails#8313 from alan/only_save_changed_has_one_objects"

This reverts commit 6e3ab3e, reversing
changes made to 39e07b6.

Conflicts:
	activerecord/CHANGELOG.md
	activerecord/test/cases/autosave_association_test.rb

Author: rafaelfranca

activerecord/CHANGELOG.md

@@ -1,3 +1,9 @@
+*   Save `has_one` association even if the record doesn't changed.
+
+    Fixes #14407.
+
+    *Rafael Mendonça França*
+
 *   Use singular table name in generated migrations when
     `ActiveRecord::Base.pluralize_table_names` is `false`.
 
@@ -76,12 +82,6 @@
 
     *Troy Kruthoff*, *Lachlan Sylvester*
 
-*   Only save has_one associations if record has changes.
-    Previously after save related callbacks, such as `#after_commit`, were triggered when the has_one
-    object did not get saved to the db.
-
-    *Alan Kennedy*
-
 *   Allow strings to specify the `#order` value.
 
     Example:

activerecord/lib/active_record/autosave_association.rb

@@ -377,16 +377,15 @@ def save_collection_association(reflection)
       def save_has_one_association(reflection)
         association = association_instance_get(reflection.name)
         record      = association && association.load_target
-
         if record && !record.destroyed?
           autosave = reflection.options[:autosave]
 
           if autosave && record.marked_for_destruction?
             record.destroy
-          elsif autosave != false
+          else
             key = reflection.options[:primary_key] ? send(reflection.options[:primary_key]) : id
+            if autosave != false && (autosave || new_record? || record_changed?(reflection, record, key))
 
-            if (autosave && record.changed_for_autosave?) || new_record? || record_changed?(reflection, record, key)
               unless reflection.through_reflection
                 record[reflection.foreign_key] = key
               end

activerecord/test/cases/autosave_association_test.rb

@@ -683,23 +683,10 @@ def save(*args)
       end
     end
 
-    @ship.pirate.catchphrase = "Changed Catchphrase"
-
     assert_raise(RuntimeError) { assert !@pirate.save }
     assert_not_nil @pirate.reload.ship
   end
 
-  def test_should_save_changed_has_one_changed_object_if_child_is_saved
-    @pirate.ship.name = "NewName"
-    assert @pirate.save
-    assert_equal "NewName", @pirate.ship.reload.name
-  end
-
-  def test_should_not_save_changed_has_one_unchanged_object_if_child_is_saved
-    @pirate.ship.expects(:save).never
-    assert @pirate.save
-  end
-
   # belongs_to
   def test_should_destroy_a_parent_association_as_part_of_the_save_transaction_if_it_was_marked_for_destroyal
     assert !@ship.pirate.marked_for_destruction?