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optimize(backend): batch query for /api/categories && /api/tags

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This commit is contained in:
netcat
2025-08-14 14:19:04 +08:00
parent 7a0afedc7c
commit 0058f20b1e
4 changed files with 42 additions and 8 deletions
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8
backend/src/main/java/com/openisle/controller/CategoryController.java
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@@ -12,6 +12,7 @@ import lombok.RequiredArgsConstructor;
import org.springframework.web.bind.annotation.*;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
@RestController
@@ -44,8 +45,11 @@ public class CategoryController {
@GetMapping
public List<CategoryDto> list() {
return categoryService.listCategories().stream()
.map(c -> categoryMapper.toDto(c, postService.countPostsByCategory(c.getId())))
List<Category> all = categoryService.listCategories();
List<Long> ids = all.stream().map(Category::getId).toList();
Map<Long, Long> postsCntByCategoryIds = postService.countPostsByCategoryIds(ids);
return all.stream()
.map(c -> categoryMapper.toDto(c, postsCntByCategoryIds.getOrDefault(c.getId(), 0L)))
.sorted((a, b) -> Long.compare(b.getCount(), a.getCount()))
.collect(Collectors.toList());
}

8
backend/src/main/java/com/openisle/controller/TagController.java
View File

@@ -15,6 +15,7 @@ import lombok.RequiredArgsConstructor;
import org.springframework.web.bind.annotation.*;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
@RestController
@@ -62,8 +63,11 @@ public class TagController {
@GetMapping
public List<TagDto> list(@RequestParam(value = "keyword", required = false) String keyword,
@RequestParam(value = "limit", required = false) Integer limit) {
List<TagDto> dtos = tagService.searchTags(keyword).stream()
.map(t -> tagMapper.toDto(t, postService.countPostsByTag(t.getId())))
List<Tag> tags = tagService.searchTags(keyword);
List<Long> tagIds = tags.stream().map(Tag::getId).toList();
Map<Long, Long> postCntByTagIds = postService.countPostsByTagIds(tagIds);
List<TagDto> dtos = tags.stream()
.map(t -> tagMapper.toDto(t, postCntByTagIds.getOrDefault(t.getId(), 0L)))
.sorted((a, b) -> Long.compare(b.getCount(), a.getCount()))
.collect(Collectors.toList());
if (limit != null && limit > 0 && dtos.size() > limit) {