code: def exists(self, record_key):
          
          ''' 
              a method to determine if a record exists in collection
  
          :param record_key: string with key of record
          :return: boolean reporting status
          '''
          
          title = '%s.exists' % self.__class__.__name__
      
      # validate inputs
          input_fields = {
              'record_key': record_key
          }
          for key, value in input_fields.items():
              object_title = '%s(%s=%s)' % (title, key, str(value))
              self.fields.validate(value, '.%s' % key, object_title)
      
      # send get metadata request
          file_path = '/%s' % record_key
          try:
              self.dropbox.files_get_metadata(file_path)
          except Exception as err:
              if str(err).find("LookupError('not_found'") > -1:
                  return False
              else:
                  raise DropboxConnectionError(title)
  
          return Truf exists(self, record_key):
          
          ''' 
              a method to determine if a record exists in collection
  
          :param record_key: string with key of record
          :return: boolean reporting status
          '''
          
          title = '%s.exists' % self.__class__.__name__
      
      # validate inputs
          input_fields = {
              'record_key': record_key
          }
          for key, value in input_fields.items():
              object_title = '%s(%s=%s)' % (title, key, str(value))
              self.fields.validate(value, '.%s' % key, object_title)
      
      # send get metadata request
          file_path = '/%s' % record_key
          try:
              self.dropbox.files_get_metadata(file_path)
          except Exception as err:
              if str(err).find("LookupError('not_found'") > -1:
                  return False
              else:
                  raise DropboxConnectionError(title)
  
          return True
docs: a method to determine if a record exists in collection
  
          :param record_key: string with key of record
          :return: boolean reporting status