Why does a dictionary lookup operation initialize a proxy if its respective
class's equals and gethashcode method only use its Id property?
namespace LookUpTest
{
public abstract class Entity
{
public virtual int Id { get; set; }
public override int GetHashCode()
{
return Id.GetHashCode();
}
public override bool Equals(object obj)
{
var entity = obj as Entity;
return entity != null && Id == entity.Id;
}
}
public class Project : Entity
{
public class ProjectMap : ClassMap<Project>
{
public ProjectMap()
{
Id(x => x.Id).GeneratedBy.Assigned();
}
}
}
public class User : Entity
{
public virtual Project Project { get; set; }
public class UserMap : ClassMap<User>
{
public UserMap()
{
Id(x => x.Id).GeneratedBy.Assigned();
References(x => x.Project);
}
}
}
[TestFixture]
public class LookupTests
{
[Test]
public void ShouldNotInitializeProxy()
{
Configuration config = null;
ISessionFactory sessionFactory =
Fluently.Configure().Database(SQLiteConfiguration.Standard.InMemory).Mappings(m
=> {
m.FluentMappings.Add<Project.ProjectMap>();m.FluentMappings.Add<User.UserMap>();}).ExposeConfiguration(cfg
=> config = cfg).BuildConfiguration().BuildSessionFactory();
Dictionary<Project, String> stringByProject = new
Dictionary<Project, string>();
User userRetrievedFromDB = null;
using (ISession session = sessionFactory.OpenSession())
{
//create tables
new SchemaExport(config).Execute(true, true, false,
session.Connection, null);
Project newProject = new Project {Id = 2};
session.Save(newProject);
User newUser = new User { Id = 1, Project = newProject };
session.Save(newUser);
//force the save of the new project and new user to the DB
session.Flush();
//add entry to dictionary
stringByProject[newUser.Project] = "test!";
//evict object from session to force retrieval from DB
session.Evict(newUser);
session.Evict(newProject);
//get user1 from DB
userRetrievedFromDB = session.Get<User>(1);
}
//Able to use Id property without causing lazy initialization
Assert.That(userRetrievedFromDB.Project.Id == 2);
//Should be able to do a dictionary lookup without initializing
the proxy granted gethashcode and equals only use the Id property
Assert.That(stringByProject[userRetrievedFromDB.Project] ==
"test!"); //Could not initialize proxy exception! Why?
}
}
}
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