fix : 쿼리문 내 비교연산자 수정 및 CustomSlice 추가

src/main/java/com/codeit/todo/repository/GoalRepository.java

@@ -34,7 +34,7 @@ public interface GoalRepository extends JpaRepository<Goal, Integer> {
 from Goal g
 join fetch g.todos t
 where g.user.userId = :userId
-and g.goalId = :lastGoalId
+and g.goalId > :lastGoalId
 and :today between t.startDate and t.endDate
 """)
     Slice<Goal> findByUserAndHasTodosAfterLastGoalId(@Param("lastGoalId") Integer lastGoalId, @Param("userId") int userId, Pageable pageable,  @Param("today") LocalDate today);

src/main/java/com/codeit/todo/service/todo/impl/TodoServiceImpl.java

@@ -13,8 +13,8 @@
 import com.codeit.todo.service.todo.TodoService;
 import com.codeit.todo.web.dto.request.todo.*;
 import com.codeit.todo.web.dto.response.complete.ReadCompleteResponse;
+import com.codeit.todo.web.dto.response.slice.CustomSlice;
 import com.codeit.todo.web.dto.response.todo.*;
-import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.data.domain.PageRequest;
@@ -106,7 +106,7 @@ public CreateTodoResponse saveTodo(int userId, CreateTodoRequest request) {
 
     @Transactional(readOnly = true)
     @Override
-    public Slice<ReadTodosWithGoalsResponse> findTodoListWithGoals(int userId, @Valid ReadTodoCompleteWithGoalRequest request) {
+    public Slice<ReadTodosWithGoalsResponse> findTodoListWithGoals(int userId, ReadTodoCompleteWithGoalRequest request) {
         int pageSize = request.size();
         Pageable pageable = PageRequest.of(0, pageSize);
 
@@ -130,7 +130,11 @@ public Slice<ReadTodosWithGoalsResponse> findTodoListWithGoals(int userId, @Vali
                 })
                 .toList();
 
-        return new SliceImpl<>(responses, pageable, goals.hasNext());
+        Integer nextCursor = goals.hasNext()
+                ? goals.getContent().get(goals.getContent().size() - 1).getGoalId()
+                : null;
+
+        return new CustomSlice<>(responses, pageable, goals.hasNext(), nextCursor);
     }
 
     @Transactional(readOnly = true)

src/main/java/com/codeit/todo/web/dto/response/slice/CustomSlice.java

@@ -0,0 +1,19 @@
+package com.codeit.todo.web.dto.response.slice;
+
+import lombok.Builder;
+import lombok.Getter;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.SliceImpl;
+
+import java.util.List;
+
+@Getter
+public class CustomSlice<T> extends SliceImpl<T> {
+    private final Integer nextCursor;
+
+    @Builder
+    public CustomSlice(List<T> content, Pageable pageable, boolean hasNext, Integer nextCursor) {
+        super(content, pageable, hasNext);
+        this.nextCursor = nextCursor;
+    }
+}

src/main/java/com/codeit/todo/web/dto/response/todo/ReadTodosWithGoalsResponse.java

@@ -11,6 +11,7 @@ public record ReadTodosWithGoalsResponse(
         String goalTitle,
         String goalColor,
         double progress,
+        int nextCursor,
         List<ReadTodosResponse> todos
 ) {
     public static ReadTodosWithGoalsResponse from(Goal goal, List<ReadTodosResponse> responses, double goalProgress) {