WCF Data Services MERGE with Complex Types

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WCF

service

data

Hello everyone

just a quick question I have a javascript client implementation for WCF data services currently where I am required to do partial data updates due to the complexity of the model. I have successfully implemented the Data Services MERGE operation and it seems to work correctly for everything except complex Types. When a merge operation is performed a new instance of the complex type is initialized, the changed values are set correctly but the values that were not affected are reset to default values (because the complex type is re-instantiated). Is there anyway to prevent this behavior within the service?

basically if you have the following EntityModel exposed

class EntityModel
{
  public int Id {get; set;}
  public ComplexObject Obj {get; set;}
}

class ComplexObject()
{
  public string A {get; set;}
  public string B {get; set;}
  public string C {get; set;}
}

and i do a merge request changing the value of only the B property within the Obj property of my Entity.

OData.request(
{
    requestUri: baseUrl + '(' + model.Id + ')',
    method: "MERGE",
    data: { Id: model.Id, Obj: { B : 'Foo'  }  }
},
function () {
    alert("ok");
},
function (err) {
    alert(err.message);
}

How do i ensure the A and C properties maintain their original values ?

Thank You