feat: 전공 선택 조회 API 구현

src/main/kotlin/com/yourssu/soongpt/domain/course/application/CourseController.kt

@@ -1,6 +1,7 @@
 package com.yourssu.soongpt.domain.course.application
 
 import com.yourssu.soongpt.common.business.dto.Response
+import com.yourssu.soongpt.domain.course.application.dto.MajorElectiveCourseRequest
 import com.yourssu.soongpt.domain.course.application.dto.MajorRequiredCourseRequest
 import com.yourssu.soongpt.domain.course.business.CourseService
 import com.yourssu.soongpt.domain.course.business.dto.CourseResponse
@@ -21,4 +22,10 @@ class CourseController(
         val response = courseService.findByDepartmentNameInMajorRequired(request.department)
         return ResponseEntity.ok().body(Response(result = response))
     }
+
+    @GetMapping("/major/elective")
+    fun getMajorElectiveCourses(@Valid @ModelAttribute request: MajorElectiveCourseRequest): ResponseEntity<Response<List<CourseResponse>>> {
+        val response = courseService.findByDepartmentNameInMajorElective(request.department)
+        return ResponseEntity.ok().body(Response(result = response))
+    }
 }

src/main/kotlin/com/yourssu/soongpt/domain/course/application/dto/MajorElectiveCourseRequest.kt

@@ -0,0 +1,16 @@
+package com.yourssu.soongpt.domain.course.application.dto
+
+import jakarta.validation.constraints.NotBlank
+import org.hibernate.validator.constraints.Range
+
+data class MajorElectiveCourseRequest(
+    @Range(min = 15, max = 25, message = "학번은 15부터 25까지 가능합니다.")
+    val schoolId: Long,
+
+    @NotBlank
+    val department: String,
+
+    @Range(min = 1, max = 5, message = "학년은 1부터 5까지 가능합니다.")
+    val grade: Int,
+) {
+}

src/main/kotlin/com/yourssu/soongpt/domain/course/business/CourseService.kt

@@ -23,4 +23,14 @@ class CourseService(
             CourseResponse.from(course = it, target = targets, courseTimes = courseTimes)
         }
     }
+
+    fun findByDepartmentNameInMajorElective(departmentName: String): List<CourseResponse> {
+        val department = departmentReader.getByName(departmentName)
+        val courses = courseReader.findAllByDepartmentIdInMajorElective(department.id!!)
+        return courses.map {
+            val targets = targetReader.findAllBy(courseId = it.id!!, department = department)
+            val courseTimes = courseTimeReader.findAllByCourseId(it.id)
+            CourseResponse.from(course = it, target = targets, courseTimes = courseTimes)
+        }
+    }
 }

src/main/kotlin/com/yourssu/soongpt/domain/course/implement/CourseReader.kt

@@ -9,4 +9,8 @@ class CourseReader(
     fun findAllByDepartmentIdInMajorRequired(departmentId: Long): List<Course> {
         return courseRepository.findAllByDepartmentId(departmentId, Classification.MAJOR_REQUIRED)
     }
+
+    fun findAllByDepartmentIdInMajorElective(departmentId: Long): List<Course> {
+        return courseRepository.findAllByDepartmentId(departmentId, Classification.MAJOR_ELECTIVE)
+    }
 }

src/main/resources/http/course.http

@@ -1,8 +1,16 @@
-// 전공 필수 과목 조회
+
 @schoolId = 21
 @department = 소프트웨어학부
 @grade = 1
+
+// 전공 필수 과목 조회
 ###
 GET localhost:8080/api/courses/major/required?schoolId={{schoolId}}&department={{department}}&grade={{grade}}
 Content-Type: application/x-www-form-urlencoded
+###
+
+// 전공 선택 과목 조회
+###
+GET localhost:8080/api/courses/major/elective?schoolId={{schoolId}}&department={{department}}&grade={{grade}}
+Content-Type: application/x-www-form-urlencoded
 ###

src/test/kotlin/com/yourssu/soongpt/common/support/fixture/CourseFixture.kt

@@ -16,6 +16,13 @@ enum class CourseFixture(
         classification = Classification.MAJOR_REQUIRED,
         courseCode = 1,
         credit = 3,
+    ),
+    MAJOR_ELECTIVE(
+        courseName = "전공선택",
+        professorName = "교수명",
+        classification = Classification.MAJOR_ELECTIVE,
+        courseCode = 2,
+        credit = 3,
     );
 
     fun toDomain(courseCode: Int = this.courseCode): Course {

src/test/kotlin/com/yourssu/soongpt/domain/course/storage/business/CourseServiceTest.kt

@@ -67,4 +67,36 @@ class CourseServiceTest {
             }
         }
     }
+
+    @Nested
+    @DisplayNameGeneration(DisplayNameGenerator.ReplaceUnderscores::class)
+    inner class findByDepartmentNameInMajorElective_메서드는 {
+        @Nested
+        @DisplayNameGeneration(DisplayNameGenerator.ReplaceUnderscores::class)
+        inner class 학과를_받으면 {
+            val departmentName = "소프트웨어학부"
+            @BeforeEach
+            fun setUp() {
+                initializer.run()
+                val course = courseRepository.save(CourseFixture.MAJOR_ELECTIVE.toDomainRandomCourseCode())
+                val departmentGrade = jpaQueryFactory.selectFrom(departmentGradeEntity)
+                    .innerJoin(departmentEntity)
+                    .on(departmentGradeEntity.departmentId.eq(departmentEntity.id))
+                    .where(departmentEntity.name.eq(departmentName), departmentGradeEntity.grade.eq(4))
+                    .fetchOne()
+                    ?.toDomain()
+                    ?: throw IllegalArgumentException("소프트웨어학부 4학년이 존재하지 않습니다.")
+                targetRepository.save(Target(departmentGradeId = departmentGrade.id!!, courseId = course.id!!))
+                courseTimeRepository.save(CourseTimeFixture.MONDAY_17_19.toDomain(course.id!!))
+            }
+
+            @Test
+            @DisplayName("해당 학과가 수강대상인 과목 정보를 반환한다.")
+            fun success() {
+                val response = courseService.findByDepartmentNameInMajorElective(departmentName)
+
+                assertEquals(1, response.size)
+            }
+        }
+    }
 }