Do not re-save destroyed association on saving parent object

Closes #11450

2 files changed, 8 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/autosave_association.rb b/activerecord/lib/active_record/autosave_association.rb
index a8a1847554..c991c870ed 100644
--- a/activerecord/lib/active_record/autosave_association.rb
+++ b/activerecord/lib/active_record/autosave_association.rb
@@ -343,6 +343,7 @@ module ActiveRecord
           end
 
           records.each do |record|
+            next if record.destroyed?
 
             saved = true
 
diff --git a/activerecord/test/cases/autosave_association_test.rb b/activerecord/test/cases/autosave_association_test.rb
index 580aa96ecd..635278abc1 100644
--- a/activerecord/test/cases/autosave_association_test.rb
+++ b/activerecord/test/cases/autosave_association_test.rb
@@ -705,6 +705,13 @@ 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}") }