Getting generated key from the server after insertion

[ppoulard]

Hi,

I have a master form bound to a data source that can fetch, create, update, delete datas, and other dependant forms bound to their data sources too.

My question is about creation, which is called from masterForm.saveData(): server-side, a key is generated after the creation, and so far I return an XML structure like this:
<result code="1"><key>186</key></result>
My intention is to get the generated key and call the saveData() method of the dependant forms after setting the key.

I try to read the generated key with a DSCallback() but unfortunately, the response is a DSResponse and although it is mentionned here http://forums.smartclient.com/showth...=generated+key that we can get the generated ID, I don't know how to with SmartGWT: the only method available is response.getData() that return a ListGridRecord[] which is empty, and the other Object rawData is simply null.

So ,where is my ID and how to get it ?
Thanks for your help !

[ppoulard]

Finally, I found the solution: we have to act on the master data source:

-first, we create a new data source that reflects the XML structure returned by the server <result code="1"><key>186</key></result>:

public class Result extends DataSource {
    private static final Result RESULT = new Result();
    public static Result getInstance() {
        return RESULT;
    }
    private Result() {
        DataSourceIntegerField key = new DataSourceIntegerField("key");
        key.setValueXPath("key");
        setFields(key);
    }
}

-then, we bind it to the "insert" operation of the master data source:

        .../...
        OperationBinding insert = new OperationBinding();
        insert.setDataURL("some/path/for/insertion.xml");
        insert.setOperationType(DSOperationType.ADD);
        insert.setDataProtocol(DSProtocol.POSTPARAMS);
        insert.setRecordXPath("/result");
        insert.setResponseDataSchema(Result.getInstance());
        .../...

-when saving the master form, we just have to check if our ID was set, and take it from the result DS when necessary:

       this.form.saveData(
            new DSCallback() {
                public void execute(DSResponse response, Object rawData,
                        DSRequest request) {
                    if (id == null) {
                        ListGridRecord[] records = response.getData();
                        if (records != null && records.length > 0) {
                            id = records[0].getAttributeAsString("key");
                            // update this id to other dependant forms                           
                        } // else something wrong occurs :(
                    }
                    // call saveData() for all dependant forms
                }
            }
        );