Insert data in database depending by relation - postgresql

Question

I am using typeorm, Nest Js and postgresql database.
I have the next entities:
import {Entity, Column, PrimaryGeneratedColumn, OneToMany, ManyToOne, JoinColumn, OneToOne} from 'typeorm';
import {User} from "./user.entity";
import {MetaImages} from "./meta-images.entity";
#Entity()
export class Cars {
#PrimaryGeneratedColumn({name: "carId"})
carId: number;
#OneToMany(() => CarsColors, c => c.carId, { cascade: true })
carsColors: CarsColors[];
}
/// Colors Entity
#Entity()
export class CarsColors {
#PrimaryGeneratedColumn()
id: number;
#Column({ nullable: true})
color: string;
#ManyToOne(() => Cars, cars => cars.carId)
#JoinColumn({ name: 'carId' })
carId: Cars;
}
The idea of these entities is that i should get something like this:
{
id: 1,
carColors: [
{
id: 1,
carId: 1,
color: "red",
},
{
id: 2,
carId: 1,
color: "blue",
},
...
]
}
So, each car can have multiple colors. I want, depending by carId to add a new color in CarsColors entity.
For this i do:
await getConnection()
.createQueryBuilder()
.where("carId = :carId", {
carId: 1
})
.insert()
.into(MetaImages)
.values([{
color: 'new color',
}])
.execute();
Doing this, the new color is inserted in the db, but without carId, which is null, so the:
.where("carId = :carId", { carId: 1 })
does not work. Question: How to add new color depending by carId?

Answer 1

If you're already using query builder because of efficiency and you know carId, you should insert object directly into CarsColors:
await getConnection()
.createQueryBuilder()
.insert()
.into(CarsColors)
.values([{
carId: 1,
color: 'new color',
}])
.execute();