Merge pull request #3329 from armstrjare/autosave_collection_new_record_bug

Autosave association doesn't save all records on a new record for a collection association if there are records marked for destruction

activerecord/lib/active_record/autosave_association.rb

@@ -328,13 +328,14 @@ module ActiveRecord
         autosave = reflection.options[:autosave]
 
         if records = associated_records_to_validate_or_save(association, @new_record_before_save, autosave)
+          records_to_destroy = []
           records.each do |record|
             next if record.destroyed?
 
             saved = true
 
             if autosave && record.marked_for_destruction?
-              association.proxy.destroy(record)
+              records_to_destroy << record
             elsif autosave != false && (@new_record_before_save || record.new_record?)
               if autosave
                 saved = association.insert_record(record, false)
@@ -347,6 +348,10 @@ module ActiveRecord
 
             raise ActiveRecord::Rollback unless saved
           end
+
+          records_to_destroy.each do |record|
+            association.proxy.destroy(record)
+          end
         end
 
         # reconstruct the scope now that we know the owner's id

activerecord/test/cases/autosave_association_test.rb

@@ -767,6 +767,16 @@ class TestDestroyAsPartOfAutosaveAssociation < ActiveRecord::TestCase
     assert_equal before, @pirate.reload.birds
   end
 
+  def test_when_new_record_a_child_marked_for_destruction_should_not_affect_other_records_from_saving
+    @pirate = @ship.build_pirate(:catchphrase => "Arr' now I shall keep me eye on you matey!") # new record
+
+    3.times { |i| @pirate.birds.build(:name => "birds_#{i}") }
+    @pirate.birds[1].mark_for_destruction
+    @pirate.save!
+
+    assert_equal 2, @pirate.birds.reload.length
+  end
+
   # Add and remove callbacks tests for association collections.
   %w{ method proc }.each do |callback_type|
     define_method("test_should_run_add_callback_#{callback_type}s_for_has_many") do