active?

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 63
      def active?
        if @connection.respond_to?(:status)
          @connection.status == PGconn::CONNECTION_OK
        else
          @connection.query 'SELECT 1'
          true
        end
      # postgres-pr raises a NoMethodError when querying if no conn is available
      rescue PGError, NoMethodError
        false
      end