code: def get(self):
          
          parser = reqparse.RequestParser()
          parser.add_argument('transaction_id', type=str, required=True)
  
          args = parser.parse_args(strict=True)
          tx_id = args['transaction_id']
  
          pool = current_app.config['bigchain_pool']
  
          with pool() as bigchain:
              blocks = bigchain.get_block_containing_tx(tx_id)
  
          return blocks
docs: API endpoint to get the related blocks for a transaction.
  
          Return:
              A ``list`` of ``block_id``s that contain the given transaction. The
              list may be filtered when provided a status query parameter:
              "valid", "invalid", "undecided".