更新 TypeORM 单表继承中的实体类型

Question

Lets say I have a Base entity that implements typeorm TableInheritance (single table inheritance), and I have two deriving entities: A and B .

I want to be able to change the entity type of A to B . something like this:

const a = em.findOne(A, {}) // found one entity - entityType column is now 'A'
em.save(a as B)
em.findOne(A, {}) // nothing is found
em.findOne(B, {}) // found one entity - entityType column is now 'B'

The uid is the same and typeorm won't let me simply insert \ update.

Anyone know a way to do this? My current solution is deleting and resaving but that might be problematic with cascading relations.

Answer 1

将具有uid的实体从A转换为B ：

await em.update(A, { uid: uid }, {[entityTypeColumnName]: 'B'})