Lazy relations are not saved, DEFAULT added to insert queries

Issue type:

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

Database system/driver:

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

TypeORM version:

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

Steps to reproduce or a small repository showing the problem:

Saving a lazy relation does not read the id of the associated entity.

I have checked the tests and I cannot figure out whats wrong on my side. If I remove lazy relations, then everything is fine.

The issue is, I cannot remove it everywhere. I know its an anti-pattern but some relations are resolved dynamically on specific events to avoid unnecessary load.

I have a Feed entity with Promise<User> ManyToOne & OneToMany relations. Both side uses Promise.

@Entity()
class Feed {
    @ManyToOne(t => User, u => u.feeds)
    @JoinColumn({ name: 'user_id', referencedColumnName: 'id' })
    user: Promise<User>;

    @RelationId((f: Feed) => f.user)
    userId: string;
}
@Entity()
class User {
    @OneToMany(t => Feed, f => f.user)
    @JoinColumn({ name: 'id', referencedColumnName: 'user_id' })
    feeds: Promise<Feed[]>;
}

const user = await connection.getRepository(User).findOneOrFail(id);

const feed = new Feed();
feed.user = Promise.resolve(user);

await connection.getRepository(Feed).save(feed);

// query: INSERT INTO `feed`(`user_id`) VALUES (DEFAULT)

[totalard]

Is there any solution?

[sebapatr96]

Is there any workaround for this issue?