code: def find(self, id, columns=None):
          
          if not columns:
              columns = ['*']
  
          return self.where('id', '=', id).first(1, columns)
docs: Execute a query for a single record by id
  
          :param id: The id of the record to retrieve
          :type id: mixed
  
          :param columns: The columns of the record to retrive
          :type columns: list
  
          :return: mixed
          :rtype: mixed