public static DatabaseUserViewModel AddRolesWithPermissions(this DatabaseUserViewModel user, IEnumerable<DbRole> roles)
 {
     user.Roles = (from r in roles select r.ToViewModel().ApplyPermissions(r.Permissions.ToList())).ToList();
     return user;
 }
 public static DatabaseUserViewModel ApplyPermissions(this DatabaseUserViewModel user, IEnumerable<DbPermission> permissions)
 {
     user.Permissions = (from p in permissions select p.ToViewModel()).ToList();
     return user;
 }