1👍
✅
You need to create a new entity collection for the association if it doesn’t exist yet.
const { EntityCollection } = Shopware.Data;
if (!this.entity.products) {
this.entity.products = new EntityCollection(
'/product',
'product',
Shopware.Context.api
);
}
const product = await this.repositoryFactory.create('product').get('92961afbc50e4380b3af86b257630ade', Shopware.Context.api);
this.entity.products.add(product);
this.repository.save(this.entity, Shopware.Context.api);
Source:stackexchange.com