[FEAT] 수강중인 전체 학생 정보 조회

src/main/java/com/example/epari/assignment/controller/SubmissionController.java

@@ -4,6 +4,7 @@
 import com.example.epari.assignment.dto.submission.SubmissionRequestDto;
 import com.example.epari.assignment.dto.submission.SubmissionResponseDto;
 import com.example.epari.assignment.service.SubmissionService;
+import com.example.epari.course.repository.CourseRepository;
 import com.example.epari.global.annotation.CurrentUserEmail;
 import com.example.epari.user.domain.Student;
 import com.example.epari.user.repository.StudentRepository;
@@ -22,7 +23,9 @@ public class SubmissionController {
 
 	private final SubmissionService submissionService;
 
-	private final StudentRepository studentRepository; // 추가
+	private final StudentRepository studentRepository;
+
+	private final CourseRepository courseRepository;
 
 	@PreAuthorize("hasRole('STUDENT')")
 	@PostMapping
@@ -54,8 +57,15 @@ public ResponseEntity<SubmissionResponseDto> getSubmission(
 	@GetMapping("/list")
 	public ResponseEntity<List<SubmissionResponseDto>> getAllSubmissions(
 			@PathVariable Long courseId,
-			@PathVariable Long assignmentId) {
-		List<SubmissionResponseDto> submissions = submissionService.getSubmissionsByAssignmentId(assignmentId);
+			@PathVariable Long assignmentId,
+			@CurrentUserEmail String email) {  // 강사 권한 검증을 위해 추가
+
+		// 강사가 해당 강의의 담당자인지 확인
+		if (!courseRepository.existsByCourseIdAndInstructorEmail(courseId, email)) {
+			throw new IllegalArgumentException("해당 강의의 조회 권한이 없습니다.");
+		}
+
+		List<SubmissionResponseDto> submissions = submissionService.getSubmissionsWithStudents(courseId, assignmentId);
 		return ResponseEntity.ok(submissions);
 	}
 

src/main/java/com/example/epari/assignment/dto/submission/SubmissionResponseDto.java

@@ -95,4 +95,15 @@ public static SubmissionResponseDto from(Submission submission) {
 				.build();
 	}
 
+	public static SubmissionResponseDto createUnsubmitted(Student student, com.example.epari.assignment.domain.Assignment assignment) {
+		return SubmissionResponseDto.builder()
+				.description("")
+				.grade(null)
+				.feedback(null)
+				.status("미제출")
+				.files(List.of())
+				.student(StudentInfo.from(student))
+				.assignment(AssignmentInfo.from(assignment))
+				.build();
+	}
 }

src/main/java/com/example/epari/assignment/repository/SubmissionRepository.java

@@ -20,4 +20,12 @@ public interface SubmissionRepository extends JpaRepository<Submission, Long> {
 			"JOIN a.course c " +
 			"WHERE c.id = :courseId")
 	List<Submission> findByCourseId(Long courseId);
+
+	@Query("SELECT s FROM Submission s " +
+			"LEFT JOIN FETCH s.student " +
+			"JOIN FETCH s.assignment a " +
+			"JOIN FETCH a.course c " +
+			"WHERE a.id = :assignmentId " +
+			"AND c.id = :courseId")
+	List<Submission> findByAssignmentIdAndCourseIdWithStudent(Long assignmentId, Long courseId);
 }

src/main/java/com/example/epari/assignment/service/SubmissionService.java

@@ -228,6 +228,40 @@ public void deleteSubmission(Long courseId, Long assignmentId, Long submissionId
 		submissionRepository.delete(submission);
 	}
 
+	/**
+	 * 전체 학생 조회
+	 */
+	public List<SubmissionResponseDto> getSubmissionsWithStudents(Long courseId, Long assignmentId) {
+		// 과제 정보 조회
+		Assignment assignment = assignmentRepository.findById(assignmentId)
+				.orElseThrow(() -> new IllegalArgumentException("과제를 찾을 수 없습니다."));
+
+		// 과제가 해당 코스의 것인지 확인
+		if (!assignment.getCourse().getId().equals(courseId)) {
+			throw new IllegalArgumentException("해당 코스의 과제가 아닙니다.");
+		}
+
+		// 제출된 과제 목록 조회
+		List<Submission> submissions = submissionRepository
+				.findByAssignmentIdAndCourseIdWithStudent(assignmentId, courseId);
+
+		// 해당 코스의 모든 학생 목록 조회
+		List<Student> enrolledStudents = studentRepository.findByCourseId(courseId);
+
+		// 제출/미제출 학생 모두 포함한 응답 DTO 생성
+		return enrolledStudents.stream()
+				.map(student -> {
+					Optional<Submission> studentSubmission = submissions.stream()
+							.filter(sub -> sub.getStudent().getId().equals(student.getId()))
+							.findFirst();
+
+					return studentSubmission
+							.map(SubmissionResponseDto::from)
+							.orElse(SubmissionResponseDto.createUnsubmitted(student, assignment));
+				})
+				.collect(Collectors.toList());
+	}
+
 	/**
 	 * 파일 다운로드
 	 */

src/main/java/com/example/epari/user/repository/StudentRepository.java

@@ -1,10 +1,14 @@
 package com.example.epari.user.repository;
 
+import java.util.List;
 import java.util.Optional;
 
 import org.springframework.data.jpa.repository.JpaRepository;
 
 import com.example.epari.user.domain.Student;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
 import java.util.Optional;
 
 /**
@@ -14,4 +18,7 @@
 public interface StudentRepository extends JpaRepository<Student, Long> {
 
     Optional<Student> findByEmail(String email);
+
+	@Query("SELECT cs.student FROM CourseStudent cs WHERE cs.course.id = :courseId")
+	List<Student> findByCourseId(@Param("courseId") Long courseId);
 }