Issue Description

cascade save fails if the child entity has CreateDateColumn and PK as JoinColumn

Expected Behavior

No error

Actual Behavior

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

When

• parent entity's PK is a generated column
• child entity's PK is a JoinColumn. (sharing PK)
• child entity has special columns that require re-select (like CreateDateColumn)
• save parent and child by cascade

It fails. TypeORM doesn't get the child entity id from the parent entity's PK.

Steps to Reproduce

@Entity()
export class Bar {
    @PrimaryGeneratedColumn("increment")
    id: number;

    @Column()
    title: string;

    @OneToOne(() => Foo, foo => foo.bar, { cascade: true, eager: true })
    foo: Foo;
}

@Entity()
export class Foo {
    @PrimaryColumn()
    id: number;

    @Column()
    text: string;

    @OneToOne(() => Bar, b => b.foo, { primary: true })
    @JoinColumn({ name: "id", referencedColumnName: "id" })
    bar: Bar;

    @CreateDateColumn()
    d: Date;
}

// failing
await connection.manager.save(
   connection.getRepository(Bar).create({
        title: "bar",
        foo: { text: "foo" }
    })
);

My Environment

Additional Context

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.