gistfile1.hrl

fun({Doc}) ->
  DocumentID = proplists:get_value(<<"_id">>, Doc, null),
  case DocumentID == <<"campaigns">> of
    true ->
      AdwordsCampaigns = proplists:get_value(<<"adwords">>, Doc, null),
      [Emit(DocumentID, Campaign) || Campaign <- AdwordsCampaigns];
    false -> ignore
  end
  
end.