private static ImmutableDictionary <Guid, MyUser1> ReduceUsers(ImmutableDictionary <Guid, MyUser1> users, object action)
{
if (action is ActionOnUser a)
{
bool changed = false;
var user = users[a.targetUser].Mutate(action, ReduceUser, ref changed);
if (changed)
{
users = users.SetItem(user.id, user);
}
else
{
throw new MissingMethodException("Logic for action missing: " + a);
}
}
if (action is ActionOnUser.AddContact add)
{
// The AddContact action is handled in multiple reducers (here and below in the contacts reducer of the user):
users = users.AddOrCreate(add.newContact.id, add.newContact);
}
return(users);
}