public async Task <HttpResponseMessage> CreateRoleAssignment(int projectId, [FromBody] RoleAssignmentDTO roleAssignment)
{
if (roleAssignment == null)
{
throw new BadRequestException(ErrorMessages.ModelIsEmpty, ErrorCodes.BadRequest);
}
await _privilegesManager.DemandAny(Session.UserId, projectId,
InstanceAdminPrivileges.AccessAllProjectsAdmin, ProjectAdminPrivileges.ManageGroupsAndRoles);
RoleAssignmentValidator.ValidateModel(roleAssignment);
var createdRoleAssignmentId = await _instanceRepository.CreateRoleAssignmentAsync(projectId, roleAssignment);
return(Request.CreateResponse(HttpStatusCode.Created, createdRoleAssignmentId));
}