feat : 커리큘럼 ID로 키워드들 조회 API 구현

backend/src/main/java/wooteco/prolog/roadmap/application/RoadMapService.java

@@ -0,0 +1,43 @@
+package wooteco.prolog.roadmap.application;
+
+import static wooteco.prolog.common.exception.BadRequestCode.CURRICULUM_NOT_FOUND_EXCEPTION;
+
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import wooteco.prolog.common.exception.BadRequestException;
+import wooteco.prolog.roadmap.application.dto.KeywordsResponse;
+import wooteco.prolog.roadmap.domain.Curriculum;
+import wooteco.prolog.roadmap.domain.Keyword;
+import wooteco.prolog.roadmap.domain.repository.CurriculumRepository;
+import wooteco.prolog.roadmap.domain.repository.KeywordRepository;
+import wooteco.prolog.session.domain.Session;
+import wooteco.prolog.session.domain.repository.SessionRepository;
+
+@RequiredArgsConstructor
+@Transactional
+@Service
+public class RoadMapService {
+
+    private final CurriculumRepository curriculumRepository;
+    private final SessionRepository sessionRepository;
+    private final KeywordRepository keywordRepository;
+
+    @Transactional(readOnly = true)
+    public KeywordsResponse findAllKeywords(final Long curriculumId) {
+        final Curriculum curriculum = curriculumRepository.findById(curriculumId)
+            .orElseThrow(() -> new BadRequestException(CURRICULUM_NOT_FOUND_EXCEPTION));
+
+        final Set<Long> sessionIds = sessionRepository.findAllByCurriculumId(curriculum.getId())
+            .stream()
+            .map(Session::getId)
+            .collect(Collectors.toSet());
+
+        final List<Keyword> keywords = keywordRepository.findBySessionIdIn(sessionIds);
+
+        return KeywordsResponse.createResponseWithChildren(keywords);
+    }
+}

backend/src/main/java/wooteco/prolog/roadmap/application/dto/KeywordsResponse.java

@@ -23,4 +23,12 @@ public static KeywordsResponse createResponse(final List<Keyword> keywords) {
             .collect(Collectors.toList());
         return new KeywordsResponse(keywordsResponse);
     }
+
+    public static KeywordsResponse createResponseWithChildren(final List<Keyword> keywords) {
+        List<KeywordResponse> keywordsResponse = keywords.stream()
+            .filter(Keyword::isRoot)
+            .map(KeywordResponse::createWithAllChildResponse)
+            .collect(Collectors.toList());
+        return new KeywordsResponse(keywordsResponse);
+    }
 }

backend/src/main/java/wooteco/prolog/roadmap/domain/Keyword.java

@@ -124,6 +124,10 @@ private void validateKeywordParent(final Keyword parentKeyword) {
         }
     }
 
+    public boolean isRoot() {
+        return parent == null;
+    }
+
     public Long getParentIdOrNull() {
         if (parent == null) {
             return null;

backend/src/main/java/wooteco/prolog/roadmap/domain/repository/KeywordRepository.java

@@ -1,6 +1,7 @@
 package wooteco.prolog.roadmap.domain.repository;
 
 import java.util.List;
+import java.util.Set;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
@@ -17,4 +18,6 @@ public interface KeywordRepository extends JpaRepository<Keyword, Long> {
     @Query("SELECT k FROM Keyword k "
         + "WHERE k.sessionId = :sessionId AND k.parent IS NULL")
     List<Keyword> findBySessionIdAndParentIsNull(@Param("sessionId") Long sessionId);
+
+    List<Keyword> findBySessionIdIn(final Set<Long> sessionIds);
 }

backend/src/main/java/wooteco/prolog/roadmap/ui/RoadmapController.java

@@ -0,0 +1,20 @@
+package wooteco.prolog.roadmap.ui;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import wooteco.prolog.roadmap.application.RoadMapService;
+import wooteco.prolog.roadmap.application.dto.KeywordsResponse;
+
+@RequiredArgsConstructor
+@RestController
+public class RoadmapController {
+
+    private final RoadMapService roadMapService;
+
+    @GetMapping("/roadmaps")
+    public KeywordsResponse findRoadMapKeyword(@RequestParam final Long curriculumId) {
+        return roadMapService.findAllKeywords(curriculumId);
+    }
+}

backend/src/test/java/wooteco/prolog/roadmap/application/RoadMapServiceTest.java

@@ -0,0 +1,68 @@
+package wooteco.prolog.roadmap.application;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyLong;
+import static org.mockito.Mockito.when;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import wooteco.prolog.roadmap.application.dto.KeywordsResponse;
+import wooteco.prolog.roadmap.domain.Curriculum;
+import wooteco.prolog.roadmap.domain.Keyword;
+import wooteco.prolog.roadmap.domain.repository.CurriculumRepository;
+import wooteco.prolog.roadmap.domain.repository.KeywordRepository;
+import wooteco.prolog.session.domain.Session;
+import wooteco.prolog.session.domain.repository.SessionRepository;
+
+@ExtendWith(MockitoExtension.class)
+class RoadMapServiceTest {
+
+    @Mock
+    private CurriculumRepository curriculumRepository;
+    @Mock
+    private SessionRepository sessionRepository;
+    @Mock
+    private KeywordRepository keywordRepository;
+    @InjectMocks
+    private RoadMapService roadMapService;
+
+    @Test
+    @DisplayName("curriculumId가 주어지면 해당 커리큘럼의 키워드들을 전부 조회할 수 있다.")
+    void findAllKeywords() {
+        //given
+        final Curriculum curriculum = new Curriculum(1L, "커리큘럼1");
+        final Session session = new Session(1L, curriculum.getId(), "세션1");
+        final List<Session> sessions = Arrays.asList(session);
+        final Keyword keyword = new Keyword(1L, "자바1", "자바 설명1", 1, 5, session.getId(),
+            null, Collections.emptySet());
+
+        when(curriculumRepository.findById(anyLong()))
+            .thenReturn(Optional.of(curriculum));
+
+        when(sessionRepository.findAllByCurriculumId(anyLong()))
+            .thenReturn(sessions);
+
+        when(keywordRepository.findBySessionIdIn(any()))
+            .thenReturn(Arrays.asList(keyword));
+
+        final KeywordsResponse expected = KeywordsResponse.createResponseWithChildren(Arrays.asList(keyword));
+
+        //when
+        final KeywordsResponse actual =
+            roadMapService.findAllKeywords(curriculum.getId());
+
+        //then
+        assertThat(actual)
+            .usingRecursiveComparison()
+            .isEqualTo(expected);
+    }
+}

backend/src/test/java/wooteco/prolog/roadmap/repository/KeywordRepositoryTest.java

@@ -3,12 +3,16 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.assertAll;
 
+import java.util.Arrays;
+import java.util.HashSet;
 import java.util.List;
 import javax.persistence.EntityManager;
-import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
+import wooteco.prolog.roadmap.domain.Curriculum;
 import wooteco.prolog.roadmap.domain.Keyword;
+import wooteco.prolog.roadmap.domain.repository.CurriculumRepository;
 import wooteco.prolog.roadmap.domain.repository.KeywordRepository;
 import wooteco.prolog.session.domain.Session;
 import wooteco.prolog.session.domain.repository.SessionRepository;
@@ -23,6 +27,8 @@ class KeywordRepositoryTest {
     private SessionRepository sessionRepository;
     @Autowired
     private EntityManager em;
+    @Autowired
+    private CurriculumRepository curriculumRepository;
 
     @Test
     void 부모_키워드와_1뎁스까지의_자식_키워드를_함께_조회할_수_있다() {
@@ -105,7 +111,54 @@ class KeywordRepositoryTest {
             sessionId);
 
         // then
-        Assertions.assertThat(extractParentKeyword.size()).isEqualTo(1);
+        assertThat(extractParentKeyword.size()).isEqualTo(1);
+    }
+
+    @Test
+    @DisplayName("세션 ID 리스트로 키워드 리스트를 조회한다")
+    void findBySessionIdIn() {
+        //given
+        final Curriculum curriculum = curriculumRepository.save(new Curriculum("커리큘럼1"));
+
+        final Session session1 = sessionRepository.save(new Session(curriculum.getId(), "세션1"));
+        final Session session2 = sessionRepository.save(new Session(curriculum.getId(), "세션2"));
+        final Session session3 = sessionRepository.save(new Session(curriculum.getId(), "세션3"));
+        final Session session4 = sessionRepository.save(new Session(curriculum.getId(), "세션4"));
+        final Session session5 = sessionRepository.save(new Session(curriculum.getId(), "세션5"));
+
+        final Keyword keyword1 = keywordRepository.save(
+            Keyword.createKeyword("자바1", "자바 설명1", 1, 5, session1.getId(), null));
+        final Keyword keyword2 = keywordRepository.save(
+            Keyword.createKeyword("자바2", "자바 설명2", 2, 5, session1.getId(), keyword1));
+        final Keyword keyword3 = keywordRepository.save(
+            Keyword.createKeyword("자바3", "자바 설명3", 3, 5, session1.getId(), null));
+        final Keyword keyword4 = keywordRepository.save(
+            Keyword.createKeyword("자바4", "자바 설명4", 4, 5, session1.getId(), keyword3));
+        keywordRepository.save(
+            Keyword.createKeyword("자바5", "자바 설명5", 5, 5, session2.getId(), null));
+        keywordRepository.save(
+            Keyword.createKeyword("자바6", "자바 설명6", 6, 5, session2.getId(), keyword1));
+        keywordRepository.save(
+            Keyword.createKeyword("자바7", "자바 설명7", 7, 5, session2.getId(), null));
+        keywordRepository.save(
+            Keyword.createKeyword("자바8", "자바 설명8", 8, 5, session3.getId(), keyword2));
+        final Keyword keyword9 = keywordRepository.save(
+            Keyword.createKeyword("자바9", "자바 설명9", 9, 5, session4.getId(), keyword2));
+        final Keyword keyword10 = keywordRepository.save(
+            Keyword.createKeyword("자바10", "자바 설명10", 10, 5, session5.getId(), null));
+
+        final HashSet<Long> sessionIds = new HashSet<>(
+            Arrays.asList(session1.getId(), session4.getId(), session5.getId())
+        );
+
+        //when
+        final List<Keyword> keywords = keywordRepository.findBySessionIdIn(sessionIds);
+
+        //then
+        assertThat(keywords)
+            .usingRecursiveComparison()
+            .ignoringFields("id", "parent.id")
+            .isEqualTo(Arrays.asList(keyword1, keyword2, keyword3, keyword4, keyword9, keyword10));
     }
 
     private Keyword createKeywordParent(final Keyword keyword) {