Three way join in nhibernate

I am trying to create an NHibernate mapping to the following tables:

AutomatedTestSequence - SequenceID, SequenceName
TestStep - StepID, StepDisplay
StepSequenceMapping - SequenceID, StepID
TestParameters - SequenceID, StepID, ParamID, ParamName, ParamValue

My classes and mapping are as follows:

public class AutomatedTestSequence
{
    public virtual int Id
    {
        get;
        set;
    }

    public virtual string Name
    {
        get;
        set;
    }

    public virtual IList<TestStep> StepsList
    {
        get;
        set;
    }
}

and the mapping is:

<class name="AutomatedTestSequence" table="AutomatedTestSequence">
  <id name="Id" column="SequenceID"/>
  <property name="Name" column="SequenceName"/>

  <bag name="TestStep" table="StepSequenceMapping" cascade="none" lazy="false">
    <key column ="SequenceID" />
    <many-to-many class="TestStep" column="StepID" />
  </bag>
</class>

Second class is:

public class TestStep
{
    public virtual int Id
    {
        get;
        set;
    }

    public virtual string Display
    {
        get;
        set;
    }

    public virtual IList<StepParameter> StepParameterList
    {
        get;
        set;
    }
}

and the mapping is:

<class name="TestStep" table="TestStep">
  <id name="Id" column="StepID"/>
  <property name="Display" column="StepDisplay"/>

  <bag name="TestParameters" table="TestParameters" cascade="none" lazy="false">
    <key column ="StepID" />
    <many-to-many class="TestParameters" column="ParameterId"/>
  </bag>
</class>

Third class is:

public class StepParameter
{
    public virtual int Id
    {
        get;
        set;
    }

    public virtual string Name
    {
        get;
        set;
    }

    public virtual string value
    {
        get;
        set;
    }
}

and the mapping is:

<class name="TestParameters" table="TestParameters">
  <id name="Id" column="ParamID"/>
  <property name="Name" column="ParamName" />
  <property name="Value" column="ParamValue" />
</class>

My problem is, that the parameter is connected to a specific step in a specific automated test sequence (for example I have a parameter named StartDate it can have the value 7AM for step Open Application in automated sequence Morning Sequence, and the value 7PM for step Open Application in automated sequence Evening Sequence), but in the current mapping that I have the parameter is connected to the step no matter to which automated test sequence it belongs to. H开发者_运维问答ow do I change my mapping in order to include the automated test sequence id when mapping the parameters?

I'm not sure if this classstructure is fixed. If not consider this:

public class AutomatedTestSequence
{
    public virtual int Id { get; set; }

    public virtual string Name { get; set; }
    public virtual IList<ParameterDictionary> StepParameters { get; set; }
}

public class TestStep
{
    public virtual int Id { get; set; }

    public virtual string Display { get; set; }
}

public class ParameterDictionary
{
    public virtual AutomatedTestSequence Sequence { get; set; }
    public virtual TestStep Step { get; set; }
    /// <summary>
    /// dictionary with paramtername/value pairs
    /// </summary>
    public virtual IDictionary<string, string> Parameter { get; set; }

    public override bool Equals(object obj)
    {
        var other = obj as ParameterDictionary;
        return (other != null) && (Sequence == other.Sequence) && (Step == other.Step);
    }

    public override int GetHashCode()
    {
        return Sequence.GetHashCode() ^ Step.GetHashCode();
    }
}


class AutomatedTestSequenceMap : ClassMap<AutomatedTestSequence>
{
    public AutomatedTestSequenceMap()
    {
        Id(seq => seq.Id, "AutomatedTestSequence");

        Map(seq => seq.Name, "SequenceName");

        HasMany(seq => seq.StepParameters)
            .Table("StepSequenceMapping")
            .KeyColumn("SequenceID");
    }
}

class TestStepMap : ClassMap<TestStep>
{
    public TestStepMap()
    {
        Id(step => step.Id, "StepID");

        Map(step => step.Display, "StepDisplay");
    }
}

class ParameterDictionaryMap : ClassMap<ParameterDictionary>
{
    public ParameterDictionaryMap()
    {
        Table("StepSequenceMapping");

        CompositeId()
            .KeyReference(spmap => spmap.Sequence, "SequenceID")
            .KeyReference(spmap => spmap.Step, "StepID");

        HasMany(spmap => spmap.Parameter)
            .Table("TestParameters")
            .KeyColumns.Add("SequenceID", "StepID")
            .AsMap("ParamName")
            .Element("ParamValue");
    }
}

if you can't or dont want to use FluentNHibernate let me know and i post the xmlmappings.

remarks: ParamID ist really needed, if it is autogenerated in the database then fine, if set programmaticly then the code above has to be tweaked.

hope this helps

EDIT: the xml mappings

  <class mutable="true" name="AutomatedTestSequence" table="`AutomatedTestSequence`">
    <id name="Id" type="System.Int32" column="SequenceId">
      <generator class="identity" />
    </id>
    <property name="Name" type="System.String">
      <column name="SequenceName" />
    </property>
    <bag name="StepParameters" table="StepSequenceMapping" mutable="true">
      <key>
        <column name="SequenceID" />
      </key>
      <one-to-many class="ParameterDictionary" />
    </bag>
  </class>

  <class mutable="true" name="TestStep" table="`TestStep`">
    <id name="Id" type="System.Int32" column="StepID">
      <generator class="identity" />
    </id>
    <property name="Display" type="System.String">
      <column name="StepDisplay" />
    </property>
  </class>

  <class mutable="true" name="ParameterDictionary" table="StepSequenceMapping">
    <composite-id mapped="false">
      <key-many-to-one name="Sequence" class="AutomatedTestSequence" column="SequenceID"/>
      <key-many-to-one name="Step" class="TestStep" column="StepID"/>
    </composite-id>
    <map name="Parameter" table="TestParameters" mutable="true">
      <key>
        <column name="SequenceID" />
        <column name="StepID" />
      </key>
      <index type="System.String" column="ParamName"/>
      <element type="System.String" column="ParamValue"/>
    </map>
  </class>