Fix dynamic query method projection.

Query methods returning dynamic projections based on a Class argument now properly apply projection conversion. Previously, classes not seen by the mapping context were skipped and that caused projecting query methods to return the actual entity type.

Closes #607

Author: mp911de

src/main/java/org/springframework/data/r2dbc/repository/query/R2dbcQueryExecution.java

@@ -94,10 +94,6 @@ public Object convert(Object source) {
 				return source;
 			}
 
-			if (!mappingContext.hasPersistentEntityFor(returnedType.getReturnedType())) {
-				return source;
-			}
-
 			if (ReflectionUtils.isVoid(returnedType.getReturnedType())) {
 
 				if (source instanceof Mono) {

src/test/java/org/springframework/data/r2dbc/repository/AbstractR2dbcRepositoryIntegrationTests.java

@@ -142,7 +142,7 @@ void shouldFindItemsByNameLike() {
 				}).verifyComplete();
 	}
 
-	@Test // gh-475
+	@Test // gh-475, gh-607
 	void shouldFindApplyingInterfaceProjection() {
 
 		shouldInsertNewItems();
@@ -154,6 +154,14 @@ void shouldFindApplyingInterfaceProjection() {
 				.consumeNextWith(actual -> {
 					assertThat(actual).contains("SCHAUFELRADBAGGER", "FORSCHUNGSSCHIFF");
 				}).verifyComplete();
+
+		repository.findBy(WithName.class) //
+				.map(WithName::getName) //
+				.collectList() //
+				.as(StepVerifier::create) //
+				.consumeNextWith(actual -> {
+					assertThat(actual).contains("SCHAUFELRADBAGGER", "FORSCHUNGSSCHIFF");
+				}).verifyComplete();
 	}
 
 	@Test // gh-475
@@ -375,6 +383,8 @@ interface LegoSetRepository extends ReactiveCrudRepository<LegoSet, Integer> {
 
 		Flux<Named> findAsProjection();
 
+		<T> Flux<T> findBy(Class<T> theClass);
+
 		@Query("SELECT name from legoset")
 		Flux<LegoDto> findAsDtoProjection();
 
@@ -442,4 +452,8 @@ public LegoDto(String name, String unknown) {
 	interface Named {
 		String getName();
 	}
+
+	interface WithName {
+		String getName();
+	}
 }