public async Task UpdateReferralsAsync(OpportunityItemDto dto)
{
var existingReferrals = _referralRepository.GetManyAsync(r => r.OpportunityItemId == dto.OpportunityItemId)
.ToList();
var newReferrals = _mapper.Map <List <Referral> >(dto.Referral);
foreach (var nr in newReferrals)
{
nr.OpportunityItemId = dto.OpportunityItemId;
}
var comparer = new ReferralEqualityComparer();
var toBeAdded = newReferrals.Except(existingReferrals, comparer).ToList();
var same = existingReferrals.Intersect(newReferrals, comparer).ToList();
var toBeDeleted = existingReferrals.Except(same).ToList();
Referral Find(Referral referral) => existingReferrals.First(r => r.Id == referral.Id);
var deleteReferrals = toBeDeleted.Select(Find).ToList();
await _referralRepository.DeleteManyAsync(deleteReferrals);
await _referralRepository.CreateManyAsync(toBeAdded);
var updateReferrals = same.Select(Find).ToList();
await _referralRepository.UpdateManyAsync(updateReferrals);
}
public ReferralDifference(ReferralEqualityComparer comparer)
{
_comparer = comparer;
}
