TypeORM bulk insert? - express

Question

How do i bulk insert multiple records in 1 query so my db will be efficient
I want to create Office and insert multiple new equipments into that office.
Table/model code:
OFFICE
#Entity({ name: 'offices' })
export class Office extends Timestamps {
#OneToMany(() => Equipment, (equipment: Equipment) => equipment.office, {
onDelete: 'CASCADE',
onUpdate: 'CASCADE'
})
equipment: Array<Equipment>;
}
EQUIPMENT
#Entity({ name: 'equipment' })
export class Equipment extends Timestamps {
#Column({
name: 'equipment_id',
type: 'int',
nullable: false,
width: 2,
default: 0
})
equipment_id: number;
#ManyToOne(() => Office, (office: Office) => office.equipment)
#JoinColumn({ name: 'office_id' })
office: Office;
}

Answer 1

I suggest you to use cascades property in relationships:
#Entity({ name: 'offices' })
export class Office extends Timestamps {
#OneToMany(() => Equipment, (equipment: Equipment) => equipment.office, {
cascade: true, // <= here
onDelete: 'CASCADE',
onUpdate: 'CASCADE'
})
equipment: Array<Equipment>;
}
Now if you set equipment when creating an instance of Office, it automatically insert an Equipment instance into database:
await Office.create({equipment: ['whatever']}).save();
Or if you use data mapper approach with repositories based on this link:
const officeRepository = connection.getRepository(Office);
const office = new Office();
const equipment1 = new Equipment(); // and set your properties or make more instances
office.equipment = [equipment1]; // or more instances
await officeRepository.save(office);