Complex rule for XPO class

Question

I want to accomplish a simple rule for an XPO class.

The situation is as : - I have a Vehicle class :

public class Vehicle : BaseObject
{
    public Vehicle(Session session)
        : base(session)
    {
    }
    public override void AfterConstruction()
    {
        base.AfterConstruction();
    }

    //...properties

    [Association, DevExpress.Xpo.Aggregated]
    public XPCollection<MeterEntry> MeterEntries
    {
        get { return GetCollection<MeterEntry>("MeterEntries"); }
    }

}

And a MeterEntry class :

public class MeterEntry : BaseObject { public MeterEntry(Session session) : base(session) { } public override void AfterConstruction() { base.AfterConstruction(); }

private int _MeterValue;
private DateTime _Date;

public int MeterValue
{
    get
    {
        return _MeterValue;
    }

    set
    {
        SetPropertyValue("MeterValue", ref _MeterValue, value);
    }
}

public DateTime Date
{
    get
    {
        return _Date;
    }

    set
    {
        SetPropertyValue("Date", ref _Date, value);
    }
}

[Association]
public Vehicle Vehicle { get; set; }

}

I tried this Rule:

RuleCriteria("MeterValue >= Vehicle.MeterEntries[Date <=  xxx ].Max(MeterValue)")]

In the xxx I want the value of the current object's Date smtng like : TargetObject.Date but it doesn't work, any ideas ?

score 0 · Accepted Answer · answered Oct 18 '15 at 17:35

0

You need to use the ^ character.

RuleCriteria("MeterValue >= Vehicle.MeterEntries[Date <= ^.^.Date].Max(MeterValue)")]

See more about Parent Relationship Traversal Operator at: https://documentation.devexpress.com/#CoreLibraries/CustomDocument4928

answered Oct 18 '15 at 17:35

ErikWitkowski

460
3
8

I found another solution, instead of the use of ^ I used **'@This.Date'** – Ismail Oct 21 '15 at 06:01

Complex rule for XPO class

1 Answers1