public async Task <IActionResult> UnregisterActivity(int id)
{
var user = await GetCurrentUserAsync();
var signedUp = _prepOpsDataAccess.GetActivitySignup(id, user.Id);
if (signedUp == null)
{
return(HttpNotFound());
}
_prepOpsDataAccess.DeleteActivitySignup(signedUp.Id);
return(new HttpStatusCodeResult((int)HttpStatusCode.OK));
}