[nhibernate-issues] [NHJIRA] Created: (NH-2656) First/FirstOrDefault Doesn't Work

[Lee T. (JIRA) <nh...@gm...>]

First/FirstOrDefault Doesn't Work
---------------------------------

                 Key: NH-2656
                 URL: http://216.121.112.228/browse/NH-2656
             Project:  NHibernate
          Issue Type: Bug
          Components: Linq Provider
    Affects Versions: 3.1.0
            Reporter: Lee Timmins


I have the following tests:

[TestMethod]
public void First() {
    var result = _session.Query<Post>()
        .OrderBy(p => p.Date)
        .First(p => p.Comments.Count == 1);

    Assert.AreEqual(1, result.PostID);
}

[TestMethod]
public void FirstOrDefault() {
    var result = _session.Query<Post>()
        .OrderBy(p => p.Date)
        .FirstOrDefault(p => p.Comments.Count == 1);
    var result2 = _session.Query<Post>()
        .OrderBy(p => p.Date)
        .FirstOrDefault(p => p.Comments.Count == 10);

    Assert.AreEqual(1, result.PostID);
    Assert.IsNull(result2);
}

They both worked fine in the old Linq provider (changing Query to Linq) but in version 3.1 it throws the error:

Test method NHibernate3_1.UnitTest.First(OrDefault) threw exception: 
System.InvalidOperationException: Sequence contains no elements

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