Domain.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   namespace="NHibernate.Test.CollectionTest"
                   assembly="NHibernate.Test">

  <class name="Env">
    <id name="Id">
      <generator class="assigned"/>
    </id>
    <bag name="RequestsFailed" inverse="true" lazy="extra"
         where="RequestCompletionStatus != 1">
      <key column="EnvId"/>
      <one-to-many class="MachineRequest"/>
      <filter name="CurrentOnly"/>
    </bag>
    <map name="FailedRequestsById" inverse="true"
         where="RequestCompletionStatus != 1">
      <key column="EnvId"/>
      <map-key type="Int64" column="Id"/>
      <one-to-many class="MachineRequest"/>
      <filter name="CurrentOnly"/>
    </map>
  </class>

  <class name="MachineRequest">
    <id name="Id">
      <generator class="assigned"/>
    </id>
    <property name="EnvId"/>
    <property name="RequestCompletionStatus"/>
  </class>

  <filter-def name="CurrentOnly" condition="1 = 0"/>
</hibernate-mapping>