public async Task <Street> AddStreetAsync(string street)
{
var findedStreet = await Streets
.FirstOrDefaultAsync(m => m.StreetName.Equals(street, StringComparison.OrdinalIgnoreCase));
if (findedStreet == null)
{
findedStreet = new Street
{
StreetName = street
};
await AddAsync(findedStreet);
await SaveChangesAsync();
}
return(findedStreet);
}