with_connection

# File actioncable/lib/action_cable/subscription_adapter/postgresql.rb, line 34
      def with_connection(&block) # :nodoc:
        ActiveRecord::Base.connection_pool.with_connection do |ar_conn|
          pg_conn = ar_conn.raw_connection

          unless pg_conn.is_a?(PG::Connection)
            raise "The Active Record database must be PostgreSQL in order to use the PostgreSQL Action Cable storage adapter"
          end

          yield pg_conn
        end
      end