Use Case statement inside queryBuilder-2

Issue type:

[x] question [ ] bug report [ ] feature request [ ] documentation issue

Database system/driver:

[ ] cordova [ ] mongodb [ ] mssql [x] mysql / mariadb [ ] oracle [ ] postgres [ ] cockroachdb [ ] sqlite [ ] sqljs [ ] react-native [ ] expo

TypeORM version:

[ ] latest [ ] @next [x] 0.2.16 (or put your version here)

I’d like to use orderby in order of the values I want using the CASE WHEN statement.

I’ve already checked issue #3167 and we’ve gone ahead and there’s an error.

My code is as follows.

result = await getConnection()
          .getRepository(Post)
          .createQueryBuilder("post")
          .orderBy(_sortField, _sortOrder)
          .skip(_offset)
          .take(_limit)
          .leftJoinAndSelect("post.user", "user")
          .leftJoinAndSelect("post.products", "product")
          .leftJoinAndSelect("product.brand", "brand")
          .orderBy(`CASE WHEN product.category='SOMETHING' THEN 1 END`, "DESC") // test code, not work!
          .getMany();

Error codes are as follows:

Error: "CASE WHEN product" alias was not found. Maybe you forgot to join it?

Please help me.

[hcesar]

I did this and it worked well:

const posts = await conn.manager
      .createQueryBuilder("post", "p")
      .addSelect("CASE WHEN p.id % 2 = 0 then -p.id else p.id end", "_rank")
      .leftJoinAndSelect("p.parent", "pr")
      .skip(2)
      .take(100)
      .orderBy('_rank')
      .getMany();

It generated two queries:

query: SELECT DISTINCT `distinctAlias`.`p_id` as "ids_p_id", `distinctAlias`._rank FROM (SELECT `p`.`id` AS `p_id`, `p`.`name` AS `p_name`, `p`.`description` AS `p_description`, `p`.`parentId` AS`p_parentId`, `pr`.`id` AS `pr_id`, `pr`.`name` AS `pr_name`, `pr`.`description` AS `pr_description`, `pr`.`parentId` AS `pr_parentId`, CASE WHEN `p`.`id` % 2 = 0 then -p.id else `p`.`id` end AS `_rank` FROM `post` `p` LEFT JOIN `post` `pr` ON `pr`.`id`=`p`.`parentId`) `distinctAlias` ORDER BY `distinctAlias`._rank ASC, `p_id` ASC LIMIT 100 OFFSET 2

query: SELECT `p`.`id` AS `p_id`, `p`.`name` AS `p_name`, `p`.`description` AS `p_description`, `p`.`parentId` AS `p_parentId`, `pr`.`id` AS `pr_id`, `pr`.`name` AS `pr_name`, `pr`.`description` AS `pr_description`, `pr`.`parentId` AS `pr_parentId`, CASE WHEN `p`.`id` % 2 = 0 then -p.id else `p`.`id` end AS `_rank` FROM `post` `p` LEFT JOIN `post` `pr` ON `pr`.`id`=`p`.`parentId` WHERE `p`.`id` IN (4, 2, 1, 3, 5, 7, 9) ORDER BY _rank ASC

And the result is correct.

[NikolaLukic1]

I have the same problem. The query isn’t generated at all, just the message as @noteasybutclear provided.