Merging entities in TypeORM - mysql

Question

I'm new to TypeORM and databases overall and I have simple question.
What is the way to 'merge' entities?
For example:
I have two entities, Product and Producer:
#Entity()
export class Product {
#PrimaryGeneratedColumn()
id: number;
#Column("int")
producer_id: number;
#Column()
producer: //I want show producer data here
#Column("varchar", { length: 255 })
name: string;
}
#Entity()
export class Producer {
#PrimaryGeneratedColumn()
id: number;
#Column()
name: string;
#Column()
logo: string;
}
As you can see, in Product entity I have producer_id property which contains ID of producer.
When I'm loading the product I want TypeORM to search through producers, get one with Id matching producer_id in Product and store it in producer property.
Maybe my question is little bit embroiled but I hope you'll get the point.
Thanks for all answers.

Answer 1

As far as I can see, you're looking for a one-to-many relation (one producer many products).
Check this doc from typeorm for further info. But basically do the following:
#Entity()
export class Product {
#PrimaryGeneratedColumn()
id: number;
#Column("int")
producer_id: number;
#ManyToOne(type => Producer, producer => producer.product)
producer: Producer
#Column("varchar", { length: 255 })
name: string;
}
#Entity()
export class Producer {
#PrimaryGeneratedColumn()
id: number;
#Column()
name: string;
#Column()
logo: string;
#OneToMany(type => Product, product => product.producer)
products: Product[]
}
And then in your queries specify relations to fetch:
productRepository.find({ relations: ["producer"] });
I'm not an user of typeorm, but it should be something like that