feat: 추천 포스트 등록, 수정, 삭제 기능 추가

#1397

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

@@ -0,0 +1,59 @@
+package wooteco.prolog.roadmap.application;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import wooteco.prolog.roadmap.application.dto.RecommendedRequest;
+import wooteco.prolog.roadmap.application.dto.RecommendedUpdateRequest;
+import wooteco.prolog.roadmap.domain.Keyword;
+import wooteco.prolog.roadmap.domain.RecommendedPost;
+import wooteco.prolog.roadmap.domain.repository.KeywordRepository;
+import wooteco.prolog.roadmap.domain.repository.RecommendedRepository;
+import wooteco.prolog.roadmap.exception.KeywordNotFoundException;
+import wooteco.prolog.roadmap.exception.RecommendedPostNotFoundException;
+
+@Transactional(readOnly = true)
+@Service
+public class RecommendedService {
+
+    private final RecommendedRepository recommendedRepository;
+    private final KeywordRepository keywordRepository;
+
+    public RecommendedService(final RecommendedRepository recommendedRepository, final KeywordRepository keywordRepository) {
+        this.recommendedRepository = recommendedRepository;
+        this.keywordRepository = keywordRepository;
+    }
+
+    @Transactional
+    public Long create(final Long keywordId, final RecommendedRequest request) {
+        final Keyword keyword = findKeywordOrThrow(keywordId);
+
+        final RecommendedPost post = new RecommendedPost(request.getUrl());
+        post.addKeyword(keyword);
+
+        return recommendedRepository.save(post).getId();
+    }
+
+    private Keyword findKeywordOrThrow(final Long keywordId) {
+        return keywordRepository.findById(keywordId)
+            .orElseThrow(KeywordNotFoundException::new);
+    }
+
+    @Transactional
+    public void update(final Long recommendedId, final RecommendedUpdateRequest request) {
+        final RecommendedPost post = findPostOrThrow(recommendedId);
+
+        post.updateUrl(request.getUrl());
+    }
+
+    private RecommendedPost findPostOrThrow(final Long recommendedId) {
+        return recommendedRepository.findById(recommendedId)
+            .orElseThrow(RecommendedPostNotFoundException::new);
+    }
+
+    @Transactional
+    public void delete(final Long recommendedId) {
+        final RecommendedPost recommendedPost = findPostOrThrow(recommendedId);
+        recommendedPost.remove();
+        recommendedRepository.delete(recommendedPost);
+    }
+}

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

@@ -0,0 +1,14 @@
+package wooteco.prolog.roadmap.application.dto;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+public class RecommendedRequest {
+
+    private String url;
+}

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

@@ -0,0 +1,14 @@
+package wooteco.prolog.roadmap.application.dto;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+public class RecommendedUpdateRequest {
+
+    private String url;
+}

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

@@ -0,0 +1,7 @@
+package wooteco.prolog.roadmap.domain.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import wooteco.prolog.roadmap.domain.RecommendedPost;
+
+public interface RecommendedRepository extends JpaRepository<RecommendedPost, Long> {
+}

backend/src/main/java/wooteco/prolog/roadmap/exception/RecommendedPostNotFoundException.java

@@ -0,0 +1,6 @@
+package wooteco.prolog.roadmap.exception;
+
+import wooteco.prolog.common.exception.BadRequestException;
+
+public class RecommendedPostNotFoundException extends BadRequestException {
+}

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

@@ -0,0 +1,93 @@
+package wooteco.prolog.roadmap.application;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.transaction.annotation.Transactional;
+import wooteco.prolog.roadmap.application.dto.RecommendedRequest;
+import wooteco.prolog.roadmap.application.dto.RecommendedUpdateRequest;
+import wooteco.prolog.roadmap.domain.Keyword;
+import wooteco.prolog.roadmap.domain.RecommendedPost;
+import wooteco.prolog.roadmap.domain.repository.KeywordRepository;
+import wooteco.prolog.roadmap.domain.repository.RecommendedRepository;
+
+import java.util.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.SoftAssertions.assertSoftly;
+
+@SpringBootTest
+@Transactional
+class RecommendedServiceTest {
+
+    @Autowired
+    private RecommendedService recommendedService;
+    @Autowired
+    private RecommendedRepository recommendedRepository;
+    @Autowired
+    private KeywordRepository keywordRepository;
+
+    private Keyword keyword;
+
+    @BeforeEach
+    public void init() {
+        final Keyword keyword = Keyword.createKeyword("이름", "설명", 1, 1, 1L, null);
+        this.keyword = keywordRepository.save(keyword);
+    }
+
+    @Test
+    @DisplayName("추천 포스트 생성 테스트")
+    void create() {
+        //given
+        final RecommendedRequest request = new RecommendedRequest("https//:example.com");
+
+        //when
+        Long recommendedPostId = recommendedService.create(keyword.getId(), request);
+
+        final Keyword persistedKeyword = keywordRepository.findById(keyword.getId()).get();
+        final RecommendedPost persistedPost = recommendedRepository.findById(recommendedPostId).get();
+
+        //then
+        assertSoftly(softAssertions -> {
+            assertThat(persistedPost.getUrl()).isEqualTo(request.getUrl());
+            assertThat(persistedKeyword.getRecommendedPosts()).containsExactly(persistedPost);
+        });
+    }
+
+    @Test
+    @DisplayName("추천 포스트 수정 테스트")
+    void update() {
+        //given
+        final RecommendedRequest request = new RecommendedRequest("https//:example.com");
+        Long recommendedPostId = recommendedService.create(keyword.getId(), request);
+        String newUrl = "https//:example222.com";
+        final RecommendedUpdateRequest updateRrequest = new RecommendedUpdateRequest(newUrl);
+
+        //when
+        recommendedService.update(recommendedPostId, updateRrequest);
+        Optional<RecommendedPost> actual = recommendedRepository.findById(recommendedPostId);
+
+        //then
+        assertThat(actual.get().getUrl()).isEqualTo(newUrl);
+    }
+
+    @Test
+    @DisplayName("추천 포스트 삭제 테스트")
+    void delete() {
+        //given
+        final RecommendedRequest request = new RecommendedRequest("https//:example.com");
+        Long recommendedPostId = recommendedService.create(keyword.getId(), request);
+
+        //when
+        recommendedService.delete(recommendedPostId);
+
+        //then
+        assertSoftly(softAssertions -> {
+            assertThat(recommendedRepository.findAll()).hasSize(0);
+            assertThat(keywordRepository.findById(keyword.getId()).get().getRecommendedPosts())
+                .isEmpty();
+        });
+    }
+}