public async Task <bool> EditPerson(Person person, IList <int> topics)
{
try
{
var existingPerson = await _context.People.Include(x => x.Subscriptions).ThenInclude(x => x.Topic).SingleOrDefaultAsync(m => m.Id == person.Id);
var newTopics = topics;
var deletedTopics = existingPerson.Subscriptions.Where(x => !newTopics.Contains(x.Topic.Id)).ToList();
var addedTopics = newTopics.Except(existingPerson.Subscriptions.Select(o => o.TopicId));
foreach (Subscription subscription in deletedTopics)
{
existingPerson.Subscriptions.Remove(subscription);
}
foreach (int newTopic in addedTopics)
{
existingPerson.Subscriptions.Add(new Subscription()
{
Person = person, TopicId = newTopic
});
}
existingPerson.FirstName = person.FirstName;
existingPerson.LastName = person.LastName;
existingPerson.Telephone = person.Telephone;
existingPerson.EMail = person.EMail;
_context.Update(existingPerson);
await _context.SaveChangesAsync();
return(true);
}
catch (DbUpdateConcurrencyException)
{
if (!PersonExists(person.Id))
{
return(false);
}
else
{
throw;
}
}
}
public async Task <bool> EditTopic(Topic topic)
{
try
{
_context.Update(topic);
await _context.SaveChangesAsync();
return(true);
}
catch (DbUpdateConcurrencyException)
{
if (!TopicExists(topic.Id))
{
return(false);
}
else
{
throw;
}
}
}