Lazy relations in embedded entity broke Typeorm

[dimensi]

Issue type:

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

Database system/driver:

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

TypeORM version:

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

Steps to reproduce or a small repository showing the problem:
If i create lazy relations in embeded entity i got error

Repo example https://github.com/dimensi/typeorm-many-to-many-embeded-bug

https://github.com/dimensi/typeorm-many-to-many-embeded-bug/blob/90ba379d1a2e1d127365f5bd05a37a098dd18f61/src/entity/User.ts#L17-L20
If i remove promise, it will fix problem.

[queses]

Faced with this issue, it's still actual in 0.2.18

My temporary workaround is to define embedded entities in separate tables and to connect them with @OneToOne relation like that:

In parent entity:

@OneToOne(type => ChildEmbeddedEntity, rel => rel['parent'], { cascade: true })
private child: Promise<ChildEmbeddedEntity>

In child embedded entity:

@OneToOne(type => TestSpecialistAccount)
@JoinColumn()
private parent: ParentEntity

It works pretty OK, but adds an extra table which needs to be joined in queries.

I would be very happy to see a fix of the issue.