replace_on_target

# File activerecord/lib/active_record/associations/collection_association.rb, line 449
        def replace_on_target(record, skip_callbacks, replace,, inversing: false)
          if replace && (!record.new_record? || @replaced_or_added_targets.include?(record))
            index = @target.index(record)
          end

          catch(:abort) do
            callback(:before_add, record)
          end || return unless skip_callbacks

          set_inverse_instance(record)

          @_was_loaded = true

          yield(record) if block_given?

          if !index && @replaced_or_added_targets.include?(record)
            index = @target.index(record)
          end

          @replaced_or_added_targets << record if inversing || index || record.new_record?

          if index
            target[index] = record
          elsif @_was_loaded || !loaded?
            @association_ids = nil
            target << record
          end

          callback(:after_add, record) unless skip_callbacks

          record
        ensure
          @_was_loaded = nil
        end