NHibernate: Composite key, one-to-one relation and "Error performing LoadByUniqueKey" - nhibernate

Question

I have two classes. Class 1:
public class Einsatz
{
public virtual ProjNrPindex Id { get; set; }
public virtual Int32? Knr { get; set; }
public virtual String RessNr { get; set; }
public virtual String AdrNr { get; set; }
public virtual DateTime EndeIst { get; set; }
public virtual DateTime StartIst { get; set; }
public virtual DateTime ArbeitsbeginnIst { get; set; }
public virtual String Kennwort { get; set; }
public virtual Taetigkeit Taetigkeit { get; set; }
public Einsatz()
{
this.Id = new ProjNrPindex();
}
public class ProjNrPindex
{
public virtual Int32? Pindex { get; set; }
public virtual String ProjNr { get; set; }
public override Boolean Equals(Object obj)
{
if (obj as Einsatz == null)
{
return(false);
}
if (Object.ReferenceEquals(this, obj) == true)
{
return(true);
}
ProjNrPindex other = obj as ProjNrPindex;
if (Object.Equals(this.Pindex, other.Pindex) == false)
{
return(false);
}
if (Object.Equals(this.ProjNr, other.ProjNr) == false)
{
return(false);
}
return(true);
}
public override Int32 GetHashCode()
{
Int32 hash = 0;
hash += (this.Pindex != null) ? this.Pindex.GetHashCode() : 0;
hash += 1000 * ((this.ProjNr != null) ? this.ProjNr.GetHashCode() : 0);
return(hash);
}
}
public override bool Equals(object obj)
{
var other = obj as Einsatz;
if (ReferenceEquals(null, other)) return false;
if (ReferenceEquals(this, other)) return true;
return this.Id.Equals(other.Id);
}
public override int GetHashCode()
{
unchecked
{
int hash = GetType().GetHashCode();
hash = (hash * 31) ^ this.Id.GetHashCode();
return hash;
}
}
}
Class 2:
public class Taetigkeit
{
public virtual ProjNrPindex Id { get; set; }
public virtual string Text { get; set; }
public virtual string RessNr { get; set; }
public virtual Einsatz Einsatz { get; set; }
public Taetigkeit()
{
this.Id = new ProjNrPindex();
}
public class ProjNrPindex
{
public virtual Int32? Pindex { get; set; }
public virtual String ProjNr { get; set; }
public override Boolean Equals(Object obj)
{
if (obj as Einsatz == null)
{
return (false);
}
if (Object.ReferenceEquals(this, obj) == true)
{
return (true);
}
ProjNrPindex other = obj as ProjNrPindex;
if (Object.Equals(this.Pindex, other.Pindex) == false)
{
return (false);
}
if (Object.Equals(this.ProjNr, other.ProjNr) == false)
{
return (false);
}
return (true);
}
public override Int32 GetHashCode()
{
Int32 hash = 0;
hash += (this.Pindex != null) ? this.Pindex.GetHashCode() : 0;
hash += 1000 * ((this.ProjNr != null) ? this.ProjNr.GetHashCode() : 0);
return (hash);
}
}
public override bool Equals(object obj)
{
var other = obj as Einsatz;
if (ReferenceEquals(null, other)) return false;
if (ReferenceEquals(this, other)) return true;
return this.Id.Equals(other.Id);
}
public override int GetHashCode()
{
unchecked
{
int hash = GetType().GetHashCode();
hash = (hash * 31) ^ this.Id.GetHashCode();
return hash;
}
}
}
Mappings are:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="RestService"
namespace="RestService">
<class name="Einsatz" table="PLANUNG">
<composite-id name="Id">
<key-property name="ProjNr">
<column name="ProjNr" />
</key-property>
<key-property name="Pindex">
<column name="Pindex" />
</key-property>
</composite-id>
<property name="Knr" column="Knr" />
<property name="AdrNr" column="AdrNr" />
<property name="RessNr" column="RessNr" />
<property name="EndeIst" column="EndeIst" />
<property name="StartIst" column="StartIst" />
<property name="ArbeitsbeginnIst" column="ArbeitsbeginnIst" />
<property name="Kennwort" column="Kennwort" />
<one-to-one name="Taetigkeit" class="Taetigkeit" property-ref="Id"/>
</class>
</hibernate-mapping>
and
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="RestService"
namespace="RestService">
<class name="Taetigkeit" table="PLANBER">
<composite-id name="Id">
<key-property name="ProjNr">
<column name="ProjNr" />
</key-property>
<key-property name="Pindex">
<column name="Pindex" />
</key-property>
</composite-id>
<property name="RessNr" column="RessNr" />
<property name="Text" column="Text" />
<one-to-one name="Einsatz" class="Einsatz" property-ref="Id"/>
</class>
</hibernate-mapping>
The code:
var q = s.CreateQuery("from Einsatz e").List<Einsatz>();
gives me:
Error performing LoadByUniqueKey[SQL: SQL not available]
"The given key was not present in the dictionary."
I am afraid I am doing something horribly wrong but I don't know what. I might add that the database in sql server has no foreign keys so the data is not quite coherent.

Answer 1

your equals method is flawed. it will return false when the other object it gets is not Einsatz which should be ProjNrPindex change it to the much easier implementation:
public override bool Equals(object obj)
{
var other = obj as ProjNrPindex;
return other != null &&
Pindex == other.Pindex &&
ProjNr == other.ProjNr;
}
Also Gethashcode will throw Overflowexception in certain situations use unchecked
public override Int32 GetHashCode()
{
unchecked
{
return Pindex.GetOrDefault().GetHashCode() +
1000 * ((this.ProjNr != null) ? this.ProjNr.GetHashCode() : 0);
}
}