Question

I have a class (Invoice) with a collection (InvoiceRows).

Classes –

public class Invoice
{
     public string ID {get; set;}
     public List<InvoiceRow> InvoiceRows {get; set;}
}

public class InvoiceRow
{
    public string ID { get; set;}
    public string InvoiceID { get; set;}
    public int RowNumber { get; set;}
}

Mappings –

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
   <class name="Domain.BusinessClasses.Invoice" table="Invoices" lazy="false">
     <id name="ID">
       <column name="ID"/>
       <generator class="assigned"/>
     </id>
     <bag name="InvoiceRows" lazy="false" cascade="save-update" inverse="true" order-by="InvoiceRowNumber">
       <key column="InvoiceID"/>
       <one-to-many class="Domain.BusinessClasses.InvoiceRow" />
     </bag>
   </class>

   <class name="Domain.BusinessClasses.InvoiceRow" table="InvoiceRows" lazy="false">
     <id name="ID">
       <column name="ID"/>
       <generator class="assigned"/>
     </id>
     <property name="InvoiceID">
       <column name="InvoiceID"/>
     </property>
     <property name="RowNumber">
       <column name="RowNumber"/>
     </property>
   </class>

I want to get all the Invoice objects that have an InvoiceRow with RowNumber = 1 and RowNumber = 2. Preferably with ICriterion API.

Answer 1

I managed to find the answer based on Genius answer.

    var dCriteria1 = DetachedCriteria.For<InvoiceRow>("r")
            .SetProjection(Projections.Property("r.RowNumber"))
            .SetProjection(Projections.Property("r.InvoiceID")) // Must be last!!!!
            .Add(Restrictions.Eq("r.RowNumber", 1));

    var dCriteria2 = DetachedCriteria.For<InvoiceRow>("r")
            .SetProjection(Projections.Property("r.RowNumber"))
            .SetProjection(Projections.Property("r.InvoiceID")) // Must be last!!!!
            .Add(Restrictions.Eq("r.RowNumber", 2));


    var invoices = Session.CreateCriteria<Invoice>()
            .Add(Subqueries.PropertyIn("ID", dCriteria1))
            .Add(Subqueries.PropertyIn("ID", dCriteria2))          
            .List<Invoice>();