I have implemented method AttributeConverter.convertToEntityAttribute to load json data from the db. I am not trying to persist data, but for some reason convertToDatabaseColumn is being called.
This is what happens:
1. I call a repository method
2. then a call to AttributeConverter.convertToEntityAttribute follows -> returns a list of entity Cx. Till this point everything is normal.
3. But for some reason AttributeConverter.convertToDatabaseColumn is called right after, with that same list of entity Cx as argument -> returns stringV
4.Now convertToEntityAttribute is called again with stringV as argument, which is also strange.
Could it be that a @OneToOne relation is causing this? Why is this executing convertToDatabaseColumn if I'm not persisting an entity, at least explicitly?
All of this happens just by calling a single method in one of my repository classes:
Here is the code
public interface RSTRepository extends CrudRepository<RST, Long> {
List<RST> findByDuctNameIgnoreCase(String ductName);
}
@Entity
@Table(name="r_s_t")
public class RST {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
@OneToOne
@JoinColumn(name = "r_s_id")
private Rs rs;
@Column(name = "channel")
private String channelName;
...
}
@Entity
@Table(name="r_s")
public class RS {
@Id
@Column(name = "rs_id", columnDefinition = "json")
@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
@Column(name = "c_x", columnDefinition = "json")
@Convert(converter = JsonToCxConverter.class)
private List<Cx> cxs;
...
}
public class Cx {
private Long someId;
private List<Long> values;
...
}
@Converter
public class JsonToCxConverterimplements AttributeConverter<List<Cx>, String>{
//this gets executed
@Override
public String convertToDatabaseColumn(List<Cx> entityAttribute) {
ObjectMapper objectMapper = new ObjectMapper();
log.info("--------------------");
return "";
}
@Override
public List<Cs> convertToEntityAttribute(String dbData) {
if (dbData == null || dbData.isEmpty()) return Collections.emptyList();
//... uses the object mapper to parse the json and return a simple object.
...
}
Like I said, this happens when calling RSTRepository.findByDuctNameIgnoreCase
