fix: 期刊推荐判断是否为空

boyang
1 parent f22b52e0
Showing 1 changed file with 29 additions and 7 deletions
shop/src/main/java/com/canrd/shop/service/impl/ProductServiceImpl.java
@@ -213,13 +213,35 @@ public class ProductServiceImpl extends ServiceImpl&lt;ProductMapper, ProductDO&gt; im
             productVO.setRelatedProductIds(relatedProductIds);
         }
  
-        List<JournalCategoryRelation> journalCategoryRelations = journalCategoryService.lambdaQuery()
-                .in(JournalCategoryRelation::getCategoryId, categoryIds)
-                .list();
-        List<Long> journalIds = journalCategoryRelations.stream().map(JournalCategoryRelation::getJournalId).collect(Collectors.toList());
-        List<Journal> journals = journalService.lambdaQuery()
-                .in(Journal::getId, journalIds)
-                .list();
+//        List<JournalCategoryRelation> journalCategoryRelations = journalCategoryService.lambdaQuery()
+//                .in(JournalCategoryRelation::getCategoryId, categoryIds)
+//                .list();
+//        List<Long> journalIds = journalCategoryRelations.stream().map(JournalCategoryRelation::getJournalId).collect(Collectors.toList());
+//        List<Journal> journals = journalService.lambdaQuery()
+//                .in(Journal::getId, journalIds)
+//                .list();
+        List<JournalCategoryRelation> journalCategoryRelations = null;
+        if (categoryIds != null && !categoryIds.isEmpty()) {
+            // 查询 journalCategoryRelations，仅在 categoryIds 不为空时执行
+            journalCategoryRelations = journalCategoryService.lambdaQuery()
+                    .in(JournalCategoryRelation::getCategoryId, categoryIds)
+                    .list();
+        } else {
+            journalCategoryRelations = Collections.emptyList(); // 如果 categoryIds 为空，返回空列表
+        }
+
+        List<Long> journalIds = journalCategoryRelations.stream()
+                .map(JournalCategoryRelation::getJournalId)
+                .collect(Collectors.toList());
+
+        // 查询 journals，仅在 journalIds 不为空时执行
+        List<Journal> journals = Collections.emptyList();
+        if (!journalIds.isEmpty()) {
+            journals = journalService.lambdaQuery()
+                    .in(Journal::getId, journalIds)
+                    .list();
+        }
+
         journals = journals.stream()
                 .collect(Collectors.toMap(
                         Journal::getTitle,