public async Task <IActionResult> AttachUser(Guid reportId, string email)
{
if (await _reportService.ContainsUser(reportId, email))
{
return(BadRequest($"User with email='{email}' already attached to report with id='{reportId}'"));
}
await _reportService.AttachUserAsync(reportId, email);
return(Ok($"User with email='{email}' was successfully attached to report with id='{reportId}'"));
}