I am creating department pages that display a list of members in that department. My members are grouped into department Member Groups and I would like to relate these Member Groups to a respective department page with details of each department.

There is an option in Umbraco (version 7.1.6) to relate Member Groups, however I am not quite sure what to pass to the relate method in the RelationService API.

I can only seem to find a way to retrieve a list of all roles/member groups rather that a specific member group by its name. Once I've retrieved the individual role/member group using a foreach, the Relate method does not accept it as a simple string. Is there a way of retrieving a Member Group object that I am missing?

var relationService = Services.RelationService;
var contentService = Services.ContentService;

var rolesList = memberService.GetAllRoles();
var busDoc = contentService.GetById(1234);

foreach(var role in rolesList)
{
    switch (role)
    {
        case "Business Development":
            relationService.Relate(role, busDoc, "departments");
            break;
        etc...
    }
}

Thanks in advance for any help, Aaron