Cannot update entity because entity id is not set in the entity.

Issue Description

When trying to save a record I get Cannot update entity because entity id is not set in the entity. The payload do not contain any id.

Expected Behavior

Being able to create a new record.

Actual Behavior

Throws the error 'Cannot update entity because entity id is not set in the entity.'

Steps to Reproduce

1. Get a transaction,
2. Run save method on your entity with said EntityManager and a payload without “id” property.

return this.repo.manager.transaction(entityManager) => {
     return entityManager.save(Entity, payload);
})

My Environment

Additional Context

using nest.js: @nestjs/cli@7.6.0 typescript@4.2.3

Relevant Database Driver(s)

• aurora-data-api
• aurora-data-api-pg
• better-sqlite3
• cockroachdb
• cordova
• expo
• mongodb
• mysql
• nativescript
• oracle
• postgres
• react-native
• sap
• sqlite
• sqlite-abstract
• sqljs
• sqlserver

Are you willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time, and I know how to start.
• Yes, I have the time, but I don’t know how to start. I would need guidance.
• No, I don’t have the time, although I believe I could do it if I had the time…
• No, I don’t have the time and I wouldn’t even know how to start.

Thanks in advance for any help !