fix: add pagination to words findAll, fix getDailyWords performance

src/words/words.controller.ts

@@ -6,8 +6,12 @@ export class WordsController {
   constructor(private readonly service: WordsService) {}
 
   @Get()
-  findAll(@Query('category') category?: string) {
-    return this.service.findAll(category);
+  findAll(
+    @Query('category') category?: string,
+    @Query('page') page?: string,
+    @Query('limit') limit?: string,
+  ) {
+    return this.service.findAll(category, page ? +page : 1, limit ? +limit : 50);
   }
 
   @Get('daily')

src/words/words.service.ts

@@ -7,9 +7,15 @@ import { Word } from './entities/word.entity';
 export class WordsService {
   constructor(@InjectRepository(Word) private repo: Repository<Word>) {}
 
-  findAll(category?: string) {
-    if (category) return this.repo.find({ where: { category } });
-    return this.repo.find();
+  async findAll(category?: string, page = 1, limit = 50) {
+    const where = category ? { category } : {};
+    const [data, total] = await this.repo.findAndCount({
+      where,
+      skip: (page - 1) * limit,
+      take: limit,
+      order: { id: 'ASC' },
+    });
+    return { data, total, page, limit, totalPages: Math.ceil(total / limit) };
   }
 
   findByIds(ids: number[]): Promise<Word[]> {
@@ -29,8 +35,12 @@ export class WordsService {
       .where('daily_date = :today AND is_daily = true', { today })
       .execute();
 
-    const all = await this.repo.find();
-    const shuffled = all.sort(() => Math.random() - 0.5).slice(0, 10);
+    const shuffled = await this.repo
+      .createQueryBuilder('w')
+      .orderBy('RAND()')
+      .limit(10)
+      .getMany();
+
     for (const w of shuffled) {
       w.is_daily = true;
       w.daily_date = today;