typeorm-optimistic-lock

TypeORM helper for optimistic lock persistance

Notes

• This library tested only for Postgres, but potentially can be improved for any database
• You should manually detect type of persistance: insert or update. Detected by entity existance while fetching as usual
• Entity should have required integer property version
• On inserting need to set version: 1
• On updating in whereUpdate need to use current version, in forUpdate need to set current version + 1

Insert example

import { typeormOptimisticLockSave } from "typeorm-optimistic-lock";

await typeormOptimisticLockSave({
  repository: connection.getRepository(Test),
  conflictError: new Error("conflict happens"),
  forInsert: { id: 1, text: "foo bar", version: 1 },
});

Update example

import { typeormOptimisticLockSave } from "typeorm-optimistic-lock";

await typeormOptimisticLockSave({
  repository: connection.getRepository(Test),
  conflictError: new Error("conflict happens"),
  forUpdate: { id: 1, text: "test", version: 2 },
  whereUpdate: { id: 1, version: 1 },
});