Sort ember data

I have a model named variableDataPackages whose structure is as follows:

TM.VariableDataPackage = DS.Model.extend({ 
    name: DS.attr(),
    number: DS.attr(),
    variableData: DS.attr(),  
    vds:DS.attr(), 
    asset_id:DS.attr(),
    vdp_id:DS.attr(), 
    type: DS.attr(),
    description: DS.attr(), 
    vdpackage_id:function(){
        if((this.get("type.name") != "d")&&(this.get("type.name") != "u")){            
            return this.get("type.name")  
        } else {
            return this.get("type.name") + this.get("number");                
        }
    }.property("type","number")   
})

The display value is a computed property and the set of records contained within the store for this model is frequently updated/deleted/created.

I want to be able to sort the records based on the vdpackage_id.

Is there any way to do this?