connected_to_stack

# File activerecord/lib/active_record/core.rb, line 247
      def self.connected_to_stack # :nodoc:
        if connected_to_stack = Thread.current.thread_variable_get(:ar_connected_to_stack)
          connected_to_stack
        else
          connected_to_stack = Concurrent::Array.new
          Thread.current.thread_variable_set(:ar_connected_to_stack, connected_to_stack)
          connected_to_stack
        end
      end