[FEAT] 프로젝트 카드 동적 쿼리 조회 로직 구현, 커서 기반 페이지네이션 적용 (#74)

* [FEAT] 프로젝트 카드 동적 쿼리 조회 로직 구현, 커서 기반 페이지네이션 적용

* [REFACT] 불필요한 프로젝트 카드 조회 메서드 제거, Slice 생성 로직 수정

* [FIX] cursorId에 대해 더 큰 값을 가져오도록 오류 수정 (eq -> gt)

src/main/java/io/oeid/mogakgo/domain/project/infrastructure/ProjectJpaRepository.java

@@ -7,7 +7,7 @@
 import org.springframework.stereotype.Repository;
 
 @Repository
-public interface ProjectJpaRepository extends JpaRepository<Project, Long> {
+public interface ProjectJpaRepository extends JpaRepository<Project, Long>, ProjectRepositoryCustom {
 
     @Query("select p from Project p where p.id = :id and p.deletedAt is null")
     @Override

src/main/java/io/oeid/mogakgo/domain/project/infrastructure/ProjectRepositoryCustom.java

@@ -0,0 +1,14 @@
+package io.oeid.mogakgo.domain.project.infrastructure;
+
+import io.oeid.mogakgo.domain.geo.domain.enums.Region;
+import io.oeid.mogakgo.domain.project.domain.entity.Project;
+import io.oeid.mogakgo.domain.project.domain.entity.enums.ProjectStatus;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
+
+public interface ProjectRepositoryCustom {
+
+    Slice<Project> findByCondition(
+        Long cursorId, Long userId, Region region, ProjectStatus projectStatus, Pageable pageable
+    );
+}

src/main/java/io/oeid/mogakgo/domain/project/infrastructure/ProjectRepositoryCustomImpl.java

@@ -0,0 +1,63 @@
+package io.oeid.mogakgo.domain.project.infrastructure;
+
+import static io.oeid.mogakgo.domain.project.domain.entity.QProject.project;
+
+import com.querydsl.core.types.dsl.BooleanExpression;
+import com.querydsl.jpa.impl.JPAQueryFactory;
+import io.oeid.mogakgo.domain.geo.domain.enums.Region;
+import io.oeid.mogakgo.domain.project.domain.entity.Project;
+import io.oeid.mogakgo.domain.project.domain.entity.enums.ProjectStatus;
+import org.springframework.data.domain.Pageable;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Slice;
+import org.springframework.data.domain.SliceImpl;
+import org.springframework.stereotype.Repository;
+
+@Repository
+@RequiredArgsConstructor
+public class ProjectRepositoryCustomImpl implements ProjectRepositoryCustom {
+
+    private final JPAQueryFactory jpaQueryFactory;
+
+    @Override
+    public Slice<Project> findByCondition(
+        Long cursorId, Long userId, Region region, ProjectStatus projectStatus, Pageable pageable
+    ) {
+        List<Project> result = jpaQueryFactory.selectFrom(project)
+            .where(
+                cursorIdEq(cursorId),
+                userIdEq(userId),
+                regionEq(region),
+                projectStatusEq(projectStatus)
+            )
+            .limit(pageable.getPageSize() + 1)
+            .fetch();
+        boolean hasNext = checkLastPage(result, pageable);
+        return new SliceImpl<>(result, pageable, hasNext);
+    }
+
+    private BooleanExpression userIdEq(Long userId) {
+        return userId != null ? project.creator.id.eq(userId) : null;
+    }
+
+    private BooleanExpression regionEq(Region region) {
+        return region != null ? project.creatorInfo.region.eq(region) : null;
+    }
+
+    private BooleanExpression projectStatusEq(ProjectStatus projectStatus) {
+        return projectStatus != null ? project.projectStatus.eq(projectStatus) : null;
+    }
+
+    private BooleanExpression cursorIdEq(Long cursorId) {
+        return cursorId != null ? project.id.gt(cursorId) : null;
+    }
+
+    private boolean checkLastPage(List<Project> projects, Pageable pageable) {
+        if (projects.size() > pageable.getPageSize()) {
+            projects.remove(pageable.getPageSize());
+            return true;
+        }
+        return false;
+    }
+}