Merge pull request #11451 from jetthoughts/11450_do_not_resave_destroyed_association

Do not re-save destroyed association on saving parent object
Conflicts:
	activerecord/lib/active_record/autosave_association.rb

Conflicts:
	activerecord/CHANGELOG.md

activerecord/lib/active_record/autosave_association.rb

@@ -339,6 +339,8 @@ module ActiveRecord
             end
 
             records.each do |record|
+              next if record.destroyed?
+
               saved = true
 
               if autosave != false && (@new_record_before_save || record.new_record?)

activerecord/test/cases/autosave_association_test.rb

@@ -734,6 +734,13 @@ class TestDestroyAsPartOfAutosaveAssociation < ActiveRecord::TestCase
     ids.each { |id| assert_nil klass.find_by_id(id) }
   end
 
+  def test_should_not_resave_destroyed_association
+    @pirate.birds.create!(name: :parrot)
+    @pirate.birds.first.destroy
+    @pirate.save!
+    assert @pirate.reload.birds.empty?
+  end
+
   def test_should_skip_validation_on_has_many_if_marked_for_destruction
     2.times { |i| @pirate.birds.create!(:name => "birds_#{i}") }