feat: 어드민 멘토 승격 요청 페이징 조회 기능 추가

src/main/java/com/example/solidconnection/admin/controller/AdminMentorApplicationController.java

@@ -0,0 +1,37 @@
+package com.example.solidconnection.admin.controller;
+
+import com.example.solidconnection.admin.dto.MentorApplicationSearchCondition;
+import com.example.solidconnection.admin.dto.MentorApplicationSearchResponse;
+import com.example.solidconnection.admin.service.AdminMentorApplicationService;
+import com.example.solidconnection.common.response.PageResponse;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RequiredArgsConstructor
+@RequestMapping("/admin/mentor-applications")
+@RestController
+@Slf4j
+public class AdminMentorApplicationController {
+    private final AdminMentorApplicationService adminMentorApplicationService;
+
+    @GetMapping
+    public ResponseEntity<PageResponse<MentorApplicationSearchResponse>> searchMentorApplications(
+            @Valid @ModelAttribute MentorApplicationSearchCondition mentorApplicationSearchCondition,
+            Pageable pageable
+    ) {
+        Page<MentorApplicationSearchResponse> page = adminMentorApplicationService.searchMentorApplications(
+                mentorApplicationSearchCondition,
+                pageable
+        );
+
+        return ResponseEntity.ok(PageResponse.of(page));
+    }
+}

src/main/java/com/example/solidconnection/admin/dto/MentorApplicationResponse.java

@@ -0,0 +1,18 @@
+package com.example.solidconnection.admin.dto;
+
+import com.example.solidconnection.mentor.domain.MentorApplicationStatus;
+import java.time.ZonedDateTime;
+
+public record MentorApplicationResponse(
+        long id,
+        String region,
+        String country,
+        String university,
+        String mentorProofUrl,
+        MentorApplicationStatus mentorApplicationStatus,
+        String rejectedReason,
+        ZonedDateTime createdAt,
+        ZonedDateTime approvedAt
+) {
+
+}

src/main/java/com/example/solidconnection/admin/dto/MentorApplicationSearchCondition.java

@@ -0,0 +1,12 @@
+package com.example.solidconnection.admin.dto;
+
+import com.example.solidconnection.mentor.domain.MentorApplicationStatus;
+import java.time.LocalDate;
+
+public record MentorApplicationSearchCondition(
+        MentorApplicationStatus mentorApplicationStatus,
+        String keyword,
+        LocalDate createdAt
+) {
+
+}

src/main/java/com/example/solidconnection/admin/dto/MentorApplicationSearchResponse.java

@@ -0,0 +1,8 @@
+package com.example.solidconnection.admin.dto;
+
+public record MentorApplicationSearchResponse(
+        SiteUserResponse siteUserResponse,
+        MentorApplicationResponse mentorApplicationResponse
+) {
+
+}

src/main/java/com/example/solidconnection/admin/service/AdminMentorApplicationService.java

@@ -0,0 +1,25 @@
+package com.example.solidconnection.admin.service;
+
+import com.example.solidconnection.admin.dto.MentorApplicationSearchCondition;
+import com.example.solidconnection.admin.dto.MentorApplicationSearchResponse;
+import com.example.solidconnection.mentor.repository.MentorApplicationRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@RequiredArgsConstructor
+@Service
+public class AdminMentorApplicationService {
+
+    private final MentorApplicationRepository mentorApplicationRepository;
+
+    @Transactional(readOnly = true)
+    public Page<MentorApplicationSearchResponse> searchMentorApplications(
+            MentorApplicationSearchCondition mentorApplicationSearchCondition,
+            Pageable pageable
+    ) {
+        return mentorApplicationRepository.searchMentorApplications(mentorApplicationSearchCondition, pageable);
+    }
+}

src/main/java/com/example/solidconnection/mentor/domain/MentorApplication.java

@@ -11,6 +11,7 @@
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
+import java.time.ZonedDateTime;
 import java.util.Collections;
 import java.util.EnumSet;
 import java.util.Set;
@@ -66,6 +67,9 @@ public class MentorApplication extends BaseEntity {
     @Enumerated(EnumType.STRING)
     private MentorApplicationStatus mentorApplicationStatus;
 
+    @Column
+    private ZonedDateTime approvedAt;
+
     private static final Set<ExchangeStatus> ALLOWED =
             Collections.unmodifiableSet(EnumSet.of(ExchangeStatus.STUDYING_ABROAD, ExchangeStatus.AFTER_EXCHANGE));
 

src/main/java/com/example/solidconnection/mentor/repository/MentorApplicationRepository.java

@@ -2,11 +2,12 @@
 
 import com.example.solidconnection.mentor.domain.MentorApplication;
 import com.example.solidconnection.mentor.domain.MentorApplicationStatus;
+import com.example.solidconnection.mentor.repository.custom.MentorApplicationFilterRepository;
 import java.util.List;
 import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
 
-public interface MentorApplicationRepository extends JpaRepository<MentorApplication, Long> {
+public interface MentorApplicationRepository extends JpaRepository<MentorApplication, Long> , MentorApplicationFilterRepository {
 
     boolean existsBySiteUserIdAndMentorApplicationStatusIn(long siteUserId, List<MentorApplicationStatus> mentorApplicationStatuses);
 

src/main/java/com/example/solidconnection/mentor/repository/custom/MentorApplicationFilterRepository.java

@@ -0,0 +1,12 @@
+package com.example.solidconnection.mentor.repository.custom;
+
+import com.example.solidconnection.admin.dto.MentorApplicationSearchCondition;
+import com.example.solidconnection.admin.dto.MentorApplicationSearchResponse;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+
+public interface MentorApplicationFilterRepository {
+
+    Page<MentorApplicationSearchResponse> searchMentorApplications(MentorApplicationSearchCondition mentorApplicationSearchCondition, Pageable pageable);
+
+}

src/main/java/com/example/solidconnection/mentor/repository/custom/MentorApplicationFilterRepositoryImpl.java

@@ -0,0 +1,145 @@
+package com.example.solidconnection.mentor.repository.custom;
+
+import static com.example.solidconnection.location.country.domain.QCountry.country;
+import static com.example.solidconnection.location.region.domain.QRegion.region;
+import static com.example.solidconnection.mentor.domain.QMentorApplication.mentorApplication;
+import static com.example.solidconnection.siteuser.domain.QSiteUser.siteUser;
+import static com.example.solidconnection.university.domain.QUniversity.university;
+import static org.springframework.util.StringUtils.hasText;
+
+import com.example.solidconnection.admin.dto.MentorApplicationResponse;
+import com.example.solidconnection.admin.dto.MentorApplicationSearchCondition;
+import com.example.solidconnection.admin.dto.MentorApplicationSearchResponse;
+import com.example.solidconnection.admin.dto.SiteUserResponse;
+import com.example.solidconnection.mentor.domain.MentorApplicationStatus;
+import com.querydsl.core.types.ConstructorExpression;
+import com.querydsl.core.types.Projections;
+import com.querydsl.core.types.dsl.BooleanExpression;
+import com.querydsl.jpa.impl.JPAQuery;
+import com.querydsl.jpa.impl.JPAQueryFactory;
+import jakarta.persistence.EntityManager;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.util.List;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageImpl;
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class MentorApplicationFilterRepositoryImpl implements MentorApplicationFilterRepository {
+
+    private static final ZoneId SYSTEM_ZONE_ID = ZoneId.systemDefault();
+
+    private static final ConstructorExpression<SiteUserResponse> SITE_USER_RESPONSE_PROJECTION =
+            Projections.constructor(
+                    SiteUserResponse.class,
+                    siteUser.id,
+                    siteUser.nickname,
+                    siteUser.profileImageUrl
+            );
+
+    private static final ConstructorExpression<MentorApplicationResponse> MENTOR_APPLICATION_RESPONSE_PROJECTION =
+            Projections.constructor(
+                    MentorApplicationResponse.class,
+                    mentorApplication.id,
+                    region.koreanName,
+                    country.koreanName,
+                    university.koreanName,
+                    mentorApplication.mentorProofUrl,
+                    mentorApplication.mentorApplicationStatus,
+                    mentorApplication.rejectedReason,
+                    mentorApplication.createdAt,
+                    mentorApplication.approvedAt
+            );
+
+    private static final ConstructorExpression<MentorApplicationSearchResponse> MENTOR_APPLICATION_SEARCH_RESPONSE_PROJECTION =
+            Projections.constructor(
+                    MentorApplicationSearchResponse.class,
+                    SITE_USER_RESPONSE_PROJECTION,
+                    MENTOR_APPLICATION_RESPONSE_PROJECTION
+            );
+
+    private final JPAQueryFactory queryFactory;
+
+    @Autowired
+    public MentorApplicationFilterRepositoryImpl(EntityManager em) {
+        this.queryFactory = new JPAQueryFactory(em);
+    }
+
+    @Override
+    public Page<MentorApplicationSearchResponse> searchMentorApplications(MentorApplicationSearchCondition condition, Pageable pageable) {
+        List<MentorApplicationSearchResponse> content = queryFactory
+                .select(MENTOR_APPLICATION_SEARCH_RESPONSE_PROJECTION)
+                .from(mentorApplication)
+                .join(siteUser).on(mentorApplication.siteUserId.eq(siteUser.id))
+                .leftJoin(university).on(mentorApplication.universityId.eq(university.id))
+                .leftJoin(region).on(university.region.eq(region))
+                .leftJoin(country).on(university.country.eq(country))
+                .where(
+                        verifyMentorStatusEq(condition.mentorApplicationStatus()),
+                        keywordContains(condition.keyword()),
+                        createdAtEq(condition.createdAt())
+                )
+                .orderBy(mentorApplication.createdAt.desc())
+                .offset(pageable.getOffset())
+                .limit(pageable.getPageSize())
+                .fetch();
+
+        Long totalCount = createCountQuery(condition).fetchOne();
+
+        return new PageImpl<>(content, pageable, totalCount != null ? totalCount : 0L);
+    }
+
+    private JPAQuery<Long> createCountQuery(MentorApplicationSearchCondition condition) {
+        JPAQuery<Long> query = queryFactory
+                .select(mentorApplication.count())
+                .from(mentorApplication);
+
+        String keyword = condition.keyword();
+
+        if (hasText(keyword)) {
+            query.join(siteUser).on(mentorApplication.siteUserId.eq(siteUser.id))
+                    .leftJoin(university).on(mentorApplication.universityId.eq(university.id))
+                    .leftJoin(region).on(university.region.eq(region))
+                    .leftJoin(country).on(university.country.eq(country));
+        }
+
+        return query.where(
+                verifyMentorStatusEq(condition.mentorApplicationStatus()),
+                keywordContains(condition.keyword()),
+                createdAtEq(condition.createdAt())
+        );
+    }
+
+    private BooleanExpression verifyMentorStatusEq(MentorApplicationStatus status) {
+        return status != null ? mentorApplication.mentorApplicationStatus.eq(status) : null;
+    }
+
+    private BooleanExpression keywordContains(String keyword) {
+        if (!hasText(keyword)) {
+            return null;
+        }
+
+        return siteUser.nickname.containsIgnoreCase(keyword)
+                .or(university.koreanName.containsIgnoreCase(keyword))
+                .or(region.koreanName.containsIgnoreCase(keyword))
+                .or(country.koreanName.containsIgnoreCase(keyword));
+    }
+
+    private BooleanExpression createdAtEq(LocalDate createdAt) {
+        if (createdAt == null) {
+            return null;
+        }
+
+        LocalDateTime startOfDay = createdAt.atStartOfDay();
+        LocalDateTime endOfDay = createdAt.plusDays(1).atStartOfDay().minusNanos(1);
+
+        return mentorApplication.createdAt.between(
+                startOfDay.atZone(SYSTEM_ZONE_ID),
+                endOfDay.atZone(SYSTEM_ZONE_ID)
+        );
+    }
+}

src/main/resources/db/migration/V39__add_approved_at_mentor_application.sql

@@ -0,0 +1,7 @@
+ALTER TABLE mentor_application
+    ADD COLUMN approved_at DATETIME(6);
+
+UPDATE mentor_application
+SET approved_at = NOW()
+WHERE mentor_application_status = 'APPROVED'
+  AND approved_at IS NULL;