feat: sort smart search

Smart search currently returns a list of assets by their score. It would
be nice if we could instead filter assets, and then list them by date.
This is the default behaviour of other platforms.

server/src/dtos/search.dto.ts

@@ -237,6 +237,14 @@ export class SmartSearchDto extends BaseSearchWithResultsDto {
   @Type(() => Number)
   @Optional()
   page?: number;
+
+  @ValidateEnum({
+    enum: AssetOrder,
+    name: 'AssetOrder',
+    optional: true,
+    description: 'Sort order by date. If not provided, results are sorted by relevance.',
+  })
+  order?: AssetOrder;
 }
 
 export class SearchPlacesDto {

server/src/repositories/search.repository.ts

@@ -129,6 +129,7 @@ export type SmartSearchOptions = SearchDateOptions &
   SearchEmbeddingOptions &
   SearchExifOptions &
   SearchOneToOneRelationOptions &
+  SearchOrderOptions &
   SearchStatusOptions &
   SearchUserIdOptions &
   SearchPeopleOptions &
@@ -300,7 +301,12 @@ export class SearchRepository {
       const items = await searchAssetBuilder(trx, options)
         .selectAll('asset')
         .innerJoin('smart_search', 'asset.id', 'smart_search.assetId')
-        .orderBy(sql`smart_search.embedding <=> ${options.embedding}`)
+        .$if(!options.orderDirection, (qb) => qb.orderBy(sql`smart_search.embedding <=> ${options.embedding}`))
+        .$if(!!options.orderDirection, (qb) =>
+          qb
+            .where(sql`(smart_search.embedding <=> ${options.embedding}) <= 0.9`)
+            .orderBy('asset.fileCreatedAt', options.orderDirection as OrderByDirection),
+        )
         .limit(pagination.size + 1)
         .offset((pagination.page - 1) * pagination.size)
         .execute();

server/src/services/search.service.ts

@@ -139,7 +139,7 @@ export class SearchService extends BaseService {
     const size = dto.size || 100;
     const { hasNextPage, items } = await this.searchRepository.searchSmart(
       { page, size },
-      { ...dto, userIds: await userIds, embedding },
+      { ...dto, userIds: await userIds, embedding, orderDirection: dto.order },
     );
 
     return this.mapResponse(items, hasNextPage ? (page + 1).toString() : null, { auth });