DTO Projections do not work with @Query annotations

Task List

• Steps to reproduce provided
• Stacktrace (if present) provided
• Example that reproduces the problem uploaded to Github
• Full description of the issue provided (see below)

Steps to Reproduce

@Introspected
@MappedEntity
data class Thing(
    @field:GeneratedValue
    @field:Id
    var id: Int? = null,
    var name: String
    var score: Int,
    var site: String
)

@Introspected
data class ThingDTO(
    val thingId: Int,
    val thingName: String
)

@Repository
@JdbcRepository(dialect = Dialect.MYSQL)
interface CasbinRuleRepository : CrudRepository<Thing, Int> {

    fun findByName(name: String): List<Thing>  // works - of course

    @Query("""
      SELECT thing.id AS thingId, thing.name AS thingName
      FROM things thing
      WHERE thing.id = :id
    """)
    fun findThingDTOsByThingId(id: Int): List<ThingDTO>  // fails!
}

Expected Behaviour

It should project the two fields onto the DTO

Actual Behaviour

Compilation Error:

error: Unable to implement Repository method: ThingRepository.findThingDTOsByThingId(Integer id). Property thingId is not present in entity: com.example.entities.Thing
    public abstract java.lang.Object findThingDTOsByThingId(@org.jetbrains.annotations.NotNull()

Environment Information

• Operating System: Mac/Linux
• Micronaut Version: 2.4.2
• Micronaut Data Version: 2.3.1
• JDK Version: 11

Should this work?

I’m not actually sure if this is something that is supported. So this could be a bug or a feature!

[dstepanov]

Superpowers…

[dstepanov]

It should use the strategy defined on the repositorie’s entity Thing