Closed as not planned
Description
Implement Automatic DTO Mapping Feature
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Issue
Implement Automatic DTO Mapping Feature
Description:
We need a feature to automatically convert entity lists obtained from @query into DTOs. The goal is to add logic that uses reflection to automatically map values from entity fields to DTO fields with the same names.
Objectives:
Implement a method for automatic mapping from entities to DTOs
Use reflection for field mapping Handle exceptions for mapping failures
Sample Code:
import ...
public class AutoMapper {
@Nullable
public static <D, E> D mapEntityToDto(Class<D> dtoClass, @Nullable E entity,
MappingContext<? extends PersistentEntity<?, ?>, ? extends PersistentProperty<?>> mappingContext) throws Exception {
Assert.notNull(dtoClass, "DTO class must not be null");
Assert.notNull(mappingContext, "MappingContext must not be null");
if (entity == null) {
return null;
}
Constructor<D> constructor = dtoClass.getConstructor();
D dtoInstance = constructor.newInstance();
PersistentEntity<?, ?> persistentEntity = mappingContext.getPersistentEntity(entity.getClass());
if (persistentEntity instanceof JpaPersistentEntity) {
JpaPersistentEntity<?> jpaPersistentEntity = (JpaPersistentEntity<?>) persistentEntity;
for (JpaPersistentProperty property : jpaPersistentEntity) {
String propertyName = property.getName();
Field dtoField = ReflectionUtils.findField(dtoClass, propertyName);
if (dtoField != null) {
ReflectionUtils.makeAccessible(dtoField);
Object value = property.getGetter().invoke(entity);
ReflectionUtils.setField(dtoField, dtoInstance, value);
}
}
}
return dtoInstance;
}
}
Benefits
Simplifies mapping process
Can be used with @query annotations, e.g.
@Query("SELECT new com.server.dto.gitHubIssue.GithubIssueListResponse$GithubIssue")
Note for Reviewers
I'm new to this and would greatly appreciate any guidance or suggestions for improvement. Thank you for your time and expertise! 🙏🏻