I have a problem with one-to-many relationships. I have the following domain classes:
public class Installation : Entity<Installation>
{
public virtual string Name { get; set; }
public virtual IList<Institution> Institutions { get; set; }
public Installation()
{
Institutions = new List<Institution>();
}
}
public class Institution : Entity
{
public virtual string Name { get; set; }
public virtual string Address { get; set; }
public virtual string City { get; set; }
public virtual Installation Installation { get; set; }
}
I have made the Entity base class according to the following post. I have the following mappings defined:
public class InstitutionMapping : ClassMap<Institution>
{
public InstitutionMapping()
{
WithTable("Institution");
Id(i => i.Id).GeneratedBy.Guid();
Map(i => i.Name).Not.Nullable().WithLengthOf(50);
Map(i => i.Address).Not.Nullable().WithLengthOf(50);
Map(i => i.City).Not.Nullable().WithLengthOf(50);
References(i => i.Installation).ColumnName("InstallationId").Not.Nullable().WithForeignKey();
}
}
public class InstallationMapping : ClassMap<Installation>
{
public InstallationMapping()
{
WithTable("Installation");
Id(i => i.Id).GeneratedBy.Guid();
Map(i => i.Name).Not.Nullable().WithLengthOf(50);
HasMany<Institution>(i => i.Institutions).KeyColumnNames.Add("InstallationId").Inverse().Cascade.All();
}
}
I unit test adding institutions to an installation in the following way:
Installation installation = TestHelper.CreateAnonymousInstallation();
installation.Institutions.Add(TestHelper.CreateAnonymousInstitution());
installation.Institutions.Add(TestHelper.CreateAnonymousInstitution());
session.Save(installation);
session.Flush();
session.Clear();
Installation returnedInstallation = session.Get<Installation>(installation.Id);
Assert.AreEqual(2, returnedInstallation.Institutions.Count);
I get an assertion exception because the returned number of institutions is 0. I have checked in the SQL Profiler and the institutions are saved in the database but their InstallationId is null. Could somebody tell me what I am doing wrong?
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