Add TODO pointers to where bugs may live

lib/ancestry/instance_methods.rb

@@ -75,28 +75,41 @@ def touch_ancestors_callback
 
     # Counter Cache
     def increase_parent_counter_cache
+      # TODO: return if ancestry_callbacks_disabled?
+      # TODO: return unless parent_id
       self.class.ancestry_base_class.increment_counter counter_cache_column, parent_id
     end
 
     def decrease_parent_counter_cache
+      # TODO: ?
       # @_trigger_destroy_callback comes from activerecord, which makes sure only once decrement when concurrent deletion.
       # but @_trigger_destroy_callback began after [email protected].
       # https://github.com/rails/rails/blob/v5.2.0/activerecord/lib/active_record/persistence.rb#L340
       # https://github.com/rails/rails/pull/14735
       # https://github.com/rails/rails/pull/27248
       return if defined?(@_trigger_destroy_callback) && !@_trigger_destroy_callback
       return if ancestry_callbacks_disabled?
+      # TODO: return unless parent_id
 
       self.class.ancestry_base_class.decrement_counter counter_cache_column, parent_id
     end
 
     def update_parent_counter_cache
+      # TODO:
+      # # @_trigger_update_callback comes from activerecord, which makes sure only once decrement when concurrent deletion.
+      # # but @_trigger_update_callback began after [email protected].
+      # # https://github.com/rails/rails/blob/v5.2.0/activerecord/lib/active_record/persistence.rb#L340
+      # # https://github.com/rails/rails/pull/27248
+      # return if defined?(@_trigger_update_callback) && !@_trigger_update_callback
       return unless saved_change_to_attribute?(self.class.ancestry_column)
+      # TODO: return if ancestry_callbacks_disabled?
 
       if parent_id_was = parent_id_before_last_save
         self.class.ancestry_base_class.decrement_counter counter_cache_column, parent_id_was
       end
 
+      # NOTE: will probably be callingincrease_parent_counter_cache instead
+      # make sure this will not break this PR
       parent_id && increase_parent_counter_cache
     end
 

test/concerns/counter_cache_test.rb

@@ -19,6 +19,9 @@ def test_counter_cache_when_destroying
     end
   end
 
+  # is this a real use case?
+  # test with disable callbacks?
+  # would like to get those rails internal variables out of this code base
   def test_counter_cache_when_reduplicate_destroying
     AncestryTestDatabase.with_model :depth => 2, :width => 2, :counter_cache => true do |_model, roots|
       parent = roots.first.first

test/concerns/sti_support_test.rb

@@ -63,6 +63,8 @@ def test_sti_support_with_from_subclass
     end
   end
 
+  # TODO: add some and remove some. make sure the updates work correctly
+  # thinking will find an issue here
   def test_sti_support_for_counter_cache
     AncestryTestDatabase.with_model :counter_cache => true, :extra_columns => {:type => :string} do |model|
       # NOTE had to use subclasses other than Subclass1/Subclass2 from above