Adonis Attach many to many relation

[Vishwas-verma]

Here is my schema ,
I want to create project and attach members to it along with there role ,that will be taken as input from user.

Here is my old controller code-

  public async store({request, response}: HttpContextContract) {
    const validateData = await request.validate({
      schema: schema.create({
        name: schema.string(),
        description: schema.string.optional(),
        members: schema.array().members(schema.object().members({
          id: schema.number(),
          role: schema.enum(Object.keys(ProjectRoleEnum))
        }))
      })
    })
    const project = await Project.create({
      name: validateData.name,
      description: validateData.description,
      createdBy: 1
    });
    await project.related('members').attach(validateData.members);
    await project.preload('creator');
    await project.preload('members', q => q.preload('todos'));
    return response.json({project})
  }

but attach function is not allowing me to do can anyone tell how to do it.
I have achieved the result in one way by running loop is there any more feasible ways of doing it as I didn't like the way.
My updated controller code is-

 public async store({request, response}: HttpContextContract) {
    const validateData = await request.validate({
      schema: schema.create({
        name: schema.string(),
        description: schema.string.optional(),
        members: schema.array().members(schema.object().members({
          id: schema.number(),
          role: schema.enum(Object.values(ProjectRoleEnum))
        }))
      })
    })
    const project = await Project.create({
      name: validateData.name,
      description: validateData.description,
      createdBy: 1
    });
    for (const u of validateData.members) {
    await project.related('members').attach({[u.id]:{
      role:u.role
      }})
    }
    await project.preload('creator');
    await project.preload('members', q => q.preload('todos'));
    return response.json({project})
  }

Here is my input-

{
    "name": "My  Project",
    "members": [
        {
            "id": 2,
            "role": "intern"
        },
        {
            "id": 3,
            "role": "project_leader"
        },
        {
            "id": 4,
            "role": "full_time"
        }
    ],
    "description": "Dummy Project"
}

The drawback of this is if we have to update members than we have to detach first members and then attach members that seems to be havoc.
Also as loop is running the attach and detach query will run as many times as many there are members in projects which is not suitable for large cases.
I know it provide sync property but using it the correct way in this is problem any suggestions??