Finding entity with with relation condition

Issue type:

[ X] question [ ] bug report [ ] feature request [ ] documentation issue

Database system/driver:

[ ] cordova [ ] mongodb [ ] mssql [ X] mysql / mariadb [ ] oracle [ ] postgres [ ] cockroachdb [ ] sqlite [ ] sqljs [ ] react-native [ ] expo

TypeORM version:

[X ] latest [ ] @next [ ] 0.x.x (or put your version here)

Hello,

Is it possible to query an entity by placing a condition on one of its join columns?

For example, let’s say I have the user entity that is in relation to the photos entity. (one-to-many relationship)

Why can’t I use the following find configuration to filter the photos based an owning user’s property. ?

Eg. I want all the photos for the users that have the firstName=‘Dan’

let photos = await photosRepo.find({
  where: {
      user: {
          firstName: 'Dan'
      }
  }
})

[alpharder]

There’s a workaround for filtering based on relation fields for findOne()/find() methods that I’ve discovered recently. The problem with filtering related table fields only exists for ObjectLiteral-style where, while string conditions work perfectly.

Assume that we have two entities – User and Role, user belongs to one role, role has many users:

@Entity()
export class User {
  name: string;

  @ManyToOne(() => Role, role => role.users)
  role: Role;
}

@Entity()
export class Role {
  @OneToMany(() => User, user => user.role)
  users: User[];
}

Now we can call findOne()/find() methods of EntityManager or repository:

roleRepository.find({
  join: { alias: 'roles', innerJoin: { users: 'roles.users' } },
  where: qb => {
    qb.where({ // Filter Role fields
      a: 1,
      b: 2
    }).andWhere('users.name = :userName', { userName: 'John Doe' }); // Filter related field
  }
});

You can omit the join part if you’ve marked your relation as an eager one.

[jeffersonlicet]

Hi, is anyone working on this? I can take this issue and try to send a pull request.