code: def build_request_include(include, params):
      
      params = params or OrderedDict()
      if include is not None:
          params['include'] = ','.join([cls._resource_type() for cls in include])
      return params
docs: Augment request parameters with includes.
  
      When one or all resources are requested an additional set of
      resources can be requested as part of the request. This function
      extends the given parameters for a request with a list of resource
      types passed in as a list of :class:`Resource` subclasses.
  
      Args:
  
          include([Resource class]): A list of resource classes to include
  
          params(dict): The (optional) dictionary of request parameters to extend
  
      Returns:
  
          An updated or new dictionary of parameters extended with an
          include query parameter.