Dynamodb List Type

I have problems understanding how to create a List for dynamoDB from my Android app. I can store and load the { 'deviceId': '920e185a-63ed-46ca-bfca-f7a484ccb708' } from my app.

Solution 1:

The list of map object can be created as follows. The good thing in the above structure is that all the attributes in data is a Number. You can change it to String if needed as well. Based on your expected output, I have defined it as Long.

Attribute Definition:-

private List<Map<String, Long>> data;

@DynamoDBAttribute(attributeName = "data")public List<Map<String, Long>> getData() {
    returndata;
}

public void setData(List<Map<String, Long>> data) {
    this.data = data;
}

Populate the data:-

MoviesWithData movies = newMoviesWithData();
    movies.setYearKey(1917);
    movies.setTitle("Tilte with list of map");

    Map<String, Long> dataMap1 = newHashMap<>();
    dataMap1.put("heartBeatId", 1L);
    dataMap1.put("status", 1L);
    dataMap1.put("timeStamp", 1502183502812L);

    Map<String, Long> dataMap2 = newHashMap<>();
    dataMap2.put("heartBeatId", 2L);
    dataMap2.put("status", 2L);
    dataMap2.put("timeStamp", 1503183502812L);

    movies.setData(Arrays.asList(dataMap1, dataMap2));
    dynamoDBMapper.save(movies, consistentDynamoDBMapperConfig);

Sample output:-