I have two model classes:
public class AlertMatchesDTO implements Serializable
{
private static final long serialVersionUID = -3704734448105124277L;
@PrimaryKey
private String alertOid;
@Column("matches")
private List<HotelPriceDTO> matches;
...
}
public class HotelPriceDTO implements Serializable
{
private static final long serialVersionUID = -8751629882750913707L;
private Long hotelOid;
private double priceByNight;
private Date checkIn;
private Date checkOut;
...
}
and I want to persist instances of the first class in a Cassandra column family using Spring Data. In particular using Cassandra template like this:
...
cassandraTemplate.insert(dto, writeOptions);
...
and Spring Data have problems serializing List<HotelPriceDTO>. What I think I need is a way to tell cassandraTemplate how to convert the type. In the official documentation, there is a chapter telling that I have to use CassandraMappingConverter and MappingCassandraConverter, but they do not provide an example yet.
My question is: is there an example of how to register a converter like this (in the test code of the project, may be?) or any other example I can use while the official documentation is completed? Thanks in advance.
Hate to say this, but you should RTFM at http://docs.spring.io/spring-data/cassandra/docs/1.1.0.RELEASE/reference/html/.
Having said that, I noticed the DTO suffixes on your class names, which implies to me that you may not have a domain model, only a service layer with DTOs. If that's the case, you might consider defining the mappings yourself as RowMapper implementations and simply use CqlTemplate without the bells & whistles of Spring Data Cassandra. If you choose to fuse the architectural concepts of DTO and entity (entity being a persistent domain object), you're free to use Spring Data Cassandra along with the mapping metadata required (@Table, @PrimaryKeyColumn, etc). Your choice.