Hi,
I have the following simple class:
public class Team
{
public virtual long id { get; set; }
public virtual String name { get; set; }
public Team() { }
}
and the following mapping:
<class name="Team" table="Team" >
<id name="id">
<generator class="native" />
</id>
<property name="name" not-null="true"/>
Two Teams with the same name are considered to be the same team.
Therefore I override the Equals and GetHashCode methods in the
following manner:
public override bool Equals(object other)
{
if (other == null) return false;
Team othert = (Team) other;
return this.name.Equals(othert.name);
}
public override int GetHashCode()
{
return name.GetHashCode();
}
Using this code could also cover the case that a transient and a
persisted object with the same name, are indeed the same object. I
create two objects:
Team t1 = new Team(); t1.name="aname";
Team t2 = new Team(); t2.name="aname";
and I save them using the SaveOrUpdate on each object (i.e.
session.SaveOrUpdate(t1);sessionSaveOrUpdate(t2))
This code results in two entries in the DB with the same name. I would
expect that NHibernate finds that the two objects are equal (using the
overriden Equal and GetHashCode methods) and the SaveOrUpdate on t2
would either update the already inserted object or fail?
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