[英]cascade save in spring data and mongodb
I'm implementing an application based on spring data and mongodb. 我正在实现一个基于spring数据和mongodb的应用程序。
@Document
public class User {
@Id
private ObjectId id;
private String name;
private Integer age;
@DBRef
private Address address;
@DBRef
@CascadeSave
private Set<Action> actions = new HashSet<Action>();
i need to save actions list as embedded document into the user, for that i implement custom cascade save 我需要将操作列表作为嵌入式文档保存到用户中,为此我实现了自定义级联保存
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface CascadeSave {
}
CascadingMongoEventListener.java CascadingMongoEventListener.java
public class CascadingMongoEventListener extends AbstractMongoEventListener<Object> {
@Autowired
private MongoOperations mongoOperations;
@Override
public void onBeforeConvert(final BeforeConvertEvent<Object> event) {
final Object source = event.getSource();
ReflectionUtils.doWithFields(source.getClass(), new ReflectionUtils.FieldCallback() {
@Override
public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException {
ReflectionUtils.makeAccessible(field);
if (field.isAnnotationPresent(DBRef.class) && field.isAnnotationPresent(CascadeSave.class)) {
final Object fieldValue = field.get(source);
if (fieldValue instanceof List<?>) {
for (Object item : (List<?>) fieldValue) {
checkNSave(item);
}
} else {
checkNSave(fieldValue);
}
}
}
});
}
private void checkNSave(Object fieldValue) {
DbRefFieldCallback callback = new DbRefFieldCallback();
ReflectionUtils.doWithFields(fieldValue.getClass(), callback);
if (!callback.isIdFound()) {
throw new MappingException("Oops, something went wrong. Child doesn't have @Id?");
}
mongoOperations.save(fieldValue);
}
private static class DbRefFieldCallback implements ReflectionUtils.FieldCallback {
private boolean idFound;
@Override
public void doWith(final Field field) throws IllegalArgumentException, IllegalAccessException {
ReflectionUtils.makeAccessible(field);
if (field.isAnnotationPresent(Id.class)) {
idFound = true;
}
}
public boolean isIdFound() {
return idFound;
}
}
}
i try to save a user with a list of actions 我尝试用操作列表保存用户
Action action = new Action();
action.setDescription("des");
action.setTime(ZonedDateTime.now());
User personHektor = new User();
personHektor.setName("Hektor");
personHektor.setActions(Stream.of(action).collect(Collectors.toSet()));
personRepo.save(personHektor);
but i have this error 但是我有这个错误
org.springframework.data.mapping.MappingException: Oops, something went wrong. org.springframework.data.mapping.MappingException:糟糕,出了点问题。 Child doesn't have @Id? 孩子没有@Id?
i pushed the project in github for more visibility 我在github中推送了该项目以提高知名度
CascadingMongoEventListener
checks the fieldValue against List
though it's actually a Set
. 尽管CascadingMongoEventListener
实际上是Set
但它会根据List
检查fieldValue 。
Change that (to maybe Collection
) and the MappingException
will go away. 将其更改(可能是Collection
),然后MappingException
将消失。
To additionally solve the issue with ZonedDateTime
please register a Converter
for the conversion. 为了进一步解决ZonedDateTime
的问题,请注册一个Converter
以进行转换。
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