DTO joins support issues

data-tck/src/main/groovy/io/micronaut/data/tck/tests/AbstractRepositorySpec.groovy

@@ -48,9 +48,7 @@ import io.micronaut.data.tck.entities.Person
 import io.micronaut.data.tck.entities.Student
 import io.micronaut.data.tck.entities.TimezoneBasicTypes
 import io.micronaut.data.tck.jdbc.entities.Role
-import io.micronaut.data.tck.jdbc.entities.User
 import io.micronaut.data.tck.jdbc.entities.UserRole
-import io.micronaut.data.tck.jdbc.entities.UserRoleId
 import io.micronaut.data.tck.repositories.*
 import io.micronaut.transaction.SynchronousTransactionManager
 import io.micronaut.transaction.TransactionCallback
@@ -1332,6 +1330,18 @@ abstract class AbstractRepositorySpec extends Specification {
             authors.forEach { assert it.books.size() == 0 }
     }
 
+    void "test DTO with nested DTO"() {
+        given:
+        saveSampleBooks()
+
+        when:
+        def optBook = bookRepository.queryByTitleContains("Stand")
+
+        then:
+        optBook.present
+        optBook.get().author
+    }
+
     void "stream joined"() {
         if (!transactionManager.isPresent()) {
             return

data-tck/src/main/java/io/micronaut/data/tck/entities/BookDtoWithAuthorDto.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2017-2020 original authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.micronaut.data.tck.entities;
+
+import io.micronaut.core.annotation.Introspected;
+
+import java.time.LocalDateTime;
+
+@Introspected
+public class BookDtoWithAuthorDto {
+
+    private String title;
+    private int totalPages;
+    private LocalDateTime lastUpdated;
+
+    private AuthorDTO author;
+
+    public BookDtoWithAuthorDto() {
+    }
+
+    public BookDtoWithAuthorDto(String title, int totalPages) {
+        this.title = title;
+        this.totalPages = totalPages;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public int getTotalPages() {
+        return totalPages;
+    }
+
+    public void setTotalPages(int totalPages) {
+        this.totalPages = totalPages;
+    }
+
+    public LocalDateTime getLastUpdated() {
+        return lastUpdated;
+    }
+
+    public void setLastUpdated(LocalDateTime lastUpdated) {
+        this.lastUpdated = lastUpdated;
+    }
+
+    public AuthorDTO getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(AuthorDTO author) {
+        this.author = author;
+    }
+}

data-tck/src/main/java/io/micronaut/data/tck/repositories/BookRepository.java

@@ -33,6 +33,7 @@
 import io.micronaut.data.tck.entities.AuthorBooksDto;
 import io.micronaut.data.tck.entities.Book;
 import io.micronaut.data.tck.entities.BookDto;
+import io.micronaut.data.tck.entities.BookDtoWithAuthorDto;
 import io.micronaut.data.tck.entities.Genre;
 
 import java.util.ArrayList;
@@ -172,4 +173,6 @@ protected Book newBook(Author author, String title, int pages) {
     abstract List<Book> findByTitleInAndTotalPagesGreaterThan(List<String> titles, int totalPages);
 
     abstract Long countByTitleInAndTotalPagesGreaterThan(List<String> titles, int totalPages);
+
+    abstract Optional<BookDtoWithAuthorDto> queryByTitleContains(String title);
 }