众所周知,使用relations
来查询与ManyToMany
有关系的数据。但如何查询多个ManyToMany
?也许你很困惑,请让我向你解释一下。
@Entity()
export class Article {
@ManyToMany(type => Classification, classification => classification.articles)
classifications: Classification[];
@ManyToMany(type => User, user => user.articles)
users: User[];
}
@Entity()
export class Classification {
@ManyToMany(type => Article, article => article.classifications)
@JoinTable()
articles: Article[];
}
@Entity()
export class User {
@ManyToMany(type => Article, article => article.users)
@JoinTable()
articles: Article[];
}
现在我想使用classificationRepository
查询数据关联Article
,而Article
应该关联User
。
但是idk怎么做。
您可以将多个联接添加到一起。首先,加入文章,然后在第二次加入中为用户引用文章:
this.categoryRepository.createQueryBuilder('classification')
.leftJoinAndSelect(
'classification.articles',
'article',)
.leftJoinAndSelect(
'article.users',
'user')
.where('article.id = :id', { id: '1' })
.getMany();