Question

could someone help me to translate LINQ expression to Nhibernate QueryOver

from m in messages
where !m.Recipients.Any(rcpt => rcpt.IsDeleted && rcpt.User = user)

I tried this

var qry = Session.QueryOver<UserMessage>();
qry.Where(m => m.Recipients.Any(r => !r.IsDeleted && r.User == user));

but got

System.Exception : Unrecognised method call: System.Linq.Enumerable:Boolean Any[TSource](System.Collections.Generic.IEnumerable1[TSource], System.Func2[TSource,System.Boolean]

Answer 1

I managed to it this way:

UserMessage messageAlias = null;

var qry = Session.QueryOver<UserMessage>(() => messageAlias);

UserMessageRecipient recipientAlias = null;

var deletedbyUser = QueryOver.Of(() => recipientAlias)
  .Select(x => x.Id)
  .Where( () => recipientAlias.Message.Id == messageAlias.Id
    && (recipientAlias.Recipient == query.User && recipientAlias.IsDeleted))
                .DetachedCriteria;
qry.Where(Subqueries.NotExists(deletedbyUser));