Many-to-many relations with custom properties select

Issue type:

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

Database system/driver:

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

TypeORM version:

[ ] latest [ ] @next [x] 0.x.x (0.2.18)

Steps to reproduce or a small repository showing the problem:

Hi! I have many-to-many relations with custom properties. For example:

@Entity()
export default class Student {
    @PrimaryGeneratedColumn()
    id: number;

    @Column()
    firstName: string;

    @Column()
    lastName: string;

    @Column()
    age: number;

    @OneToMany(() => StudentClassRoom, sc => sc.student)
    studentClassRoom: StudentClassRoom[];
}

@Entity()
export default class ClassRoom {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  name: string;

  @Column()
  hasDesk: boolean;

  @OneToMany(() => StudentClassRoom, sc => sc.classRoom)
  studentClassRoom: StudentClassRoom[];
}

@Entity()
export default class StudentClassRoom {
  @PrimaryGeneratedColumn()
  id: number;

  @ManyToOne(() => Student, student => student.studentClassRoom)
  student: Student;

  @ManyToOne(() => ClassRoom, classRoom => classRoom.studentClassRoom)
  classRoom: ClassRoom;
}

How should my query look like to get something like this:

[
  {
     id: 1,
     firstName: 'Jack',
     age: 22,
     classRoom: [
       {
          id:2,
          name: 'History',
          hasDesk: true
       }
     ]
  },
  {
     id: 2,
     firstName: 'Kate',
     age: 21,
     classRoom: [
       {
          id:1,
          name: 'Art',
          hasDesk: false
       },
       {
          id:3,
          name: 'Math',
          hasDesk: true
       }
     ]
  }
]

I have tried with left/inner join, map but to no avail( Thanks!

[thellimist]

any update on this?

[frankjrangel]

Yes, I don’t get why the documentation shows you how to do it but doesn’t tell you how to make the query to get that relation when selecting. Would love to know how to do this properly.