Skip empty-array embeddings in pgvector similarity queries.

Filter out posts and requests whose embedding column is a zero-length array so legacy rows do not crash the embedding::vector cast in ORDER BY with "vector must have at least 1 dimension" across similar posts, request match, and purchase suggestion paths.

Made-with: Cursor

Author: Xhether

src/repositories/PostRepository.ts

@@ -570,6 +570,7 @@ export class PostRepository extends AbstractRepository<PostModel> {
       .leftJoinAndSelect("post.user", "user")
       .where("post.id != :excludePostId", { excludePostId })
       .andWhere("post.embedding IS NOT NULL")
+      .andWhere("CARDINALITY(post.embedding) > 0")
       .andWhere("post.archive = false")
       .andWhere("post.sold = false")
       .andWhere("user.firebaseUid != :excludeUserId", { excludeUserId })
@@ -594,6 +595,7 @@ export class PostRepository extends AbstractRepository<PostModel> {
       .createQueryBuilder("post")
       .leftJoinAndSelect("post.user", "user")
       .where("post.embedding IS NOT NULL")
+      .andWhere("CARDINALITY(post.embedding) > 0")
       .andWhere("user.firebaseUid != :excludeUserId", { excludeUserId })
       .orderBy(`post.embedding::vector <-> CAST('${lit}' AS vector(512))`)
       .limit(limit)
@@ -717,6 +719,7 @@ export class PostRepository extends AbstractRepository<PostModel> {
       .createQueryBuilder("post")
       .leftJoinAndSelect("post.user", "user")
       .where("post.embedding IS NOT NULL")
+      .andWhere("CARDINALITY(post.embedding) > 0")
       .andWhere("post.archive = false")
       .andWhere("post.sold = false")
       .andWhere("user.firebaseUid != :excludeUserId", { excludeUserId })

src/repositories/RequestRepository.ts

@@ -128,6 +128,7 @@ export class RequestRepository extends AbstractRepository<RequestModel> {
         "distance",
       )
       .where("request.embedding IS NOT NULL")
+      .andWhere("CARDINALITY(request.embedding) > 0")
       .andWhere("user.firebaseUid != :excludeUserId", { excludeUserId })
       // 3. Safely pass the embedding string as a parameter
       .setParameter("embedding", embeddingString)