feat : 3차 세미나 실습 과제_post 생성 service 구현 #7

week02/seminar/demo/src/main/java/com/example/demo/service/PostService.java

@@ -0,0 +1,38 @@
+package com.example.demo.service;
+
+
+import com.example.demo.common.dto.ErrorMessage;
+import com.example.demo.domain.Blog;
+import com.example.demo.domain.Member;
+import com.example.demo.domain.Post;
+import com.example.demo.exception.NotFoundException;
+import com.example.demo.repository.MemberRepository;
+import com.example.demo.repository.PostRepository;
+import com.example.demo.service.dto.post.PostCreateRequest;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+public class PostService {
+
+  private final PostRepository postRepository;
+  private final MemberService memberService;
+  private final BlogService blogService;
+
+  @Transactional
+  public String create(Long memberId, Long blogId, PostCreateRequest postCreateRequest)
+  {
+    // blog 찾기
+    Blog blog = blogService.findById(blogId);
+    Long findMemberId = blog.getMember().getId();
+
+    // 요청한 사람이 블로그 소유주인지 확인
+    blogService.validateOwner(memberId, findMemberId);
+
+    Post post = postRepository.save(Post.create(blog, postCreateRequest));
+    // 블로그 글 생성하고 DB에 저장 후 생성된 id 반환
+    return post.getId().toString();
+  }
+}