'Represent an entity role
@param role_id: the pr_role record ID'

@staticmethod
def pr_role_represent(role_id):

    db = current.db
    table = db.pr_role
    role = db((table.id == role_id)).select(table.role, table.pe_id, limitby=(0, 1)).first()
    try:
        entity = current.s3db.pr_pentity_represent(role.pe_id)
        return ('%s:    %s' % (entity, role.role))
    except:
        return current.messages.UNKNOWN_OPT
