public async Task <ActionResult <Team> > PostTeam(Team team)
{
bool isUnique = await _context.IsUnique(team.name);
if (!isUnique)
{
return(ValidationProblem("Name must be unique"));
}
await _context.Create(team);
await _context.SaveChangesAsync();
return(CreatedAtAction(nameof(GetTeam), new { id = team.id }, team));
}