public async Task <IActionResult> DeclineInvitationAsync(InvitationId invitationId)
{
var userId = HttpContext.GetUserId();
var invitation = await _invitationService.FindInvitationAsync(invitationId);
if (invitation == null)
{
return(this.NotFound("The invitation was not found."));
}
var result = await _invitationService.DeclineInvitationAsync(invitation, userId);
if (result.IsValid)
{
return(this.Ok("The invitation has been declined."));
}
result.AddToModelState(ModelState);
return(this.BadRequest(new ValidationProblemDetails(ModelState)));
}