How to save relation in @ManyToMany in typeORM

Question

There are 2 entities named Article and Classification. And the relation of them is @ManyToMany.

Here\'s my question: How to sa

Answer 1

How to save relations?

Let's assume you have an array of articles and you want to create a relation to a classification entity. You just assign the array to the property articles and save the entity; typeorm will automatically create the relation.

classification.articles = [article1, article2];
await this.classificationRepository.save(classification);

For this to work, the article entities have to be saved already. If you want typeorm to automatically save the article entities, you can set cascade to true.

@ManyToMany(type => Article, article => article.classifications, { cascade: true })

---

Your example

async create(dto: ArticleClassificationDto): Promise<any> {
  let article = await this.repository.create(dto);
  article = await this.repository.save(article);
  const classifications = await this.classificationRepository.findByIds(article.classification, {relations: ['articles']});
  for (const classification of classifications) {
    classification.articles.push(article);
  }
  return this.classificationRepository.save(classifications);
}