code: def listMigrationRequests(self, migration_request_id="", block_name="",
                                dataset="", user="", oldest=False):
          
  
          conn = self.dbi.connection()
          migratee = ""
          try:
              if block_name:
                  migratee = block_name
              elif dataset:
                  migratee = dataset
              result = self.mgrlist.execute(conn, migration_url="",
                      migration_input=migratee, create_by=user,
                      migration_request_id=migration_request_id, oldest=oldest)
              return result
  
          finally:
              if conn: conn.close()
docs: get the status of the migration
          migratee : can be dataset or block_name