When you find(), or return an object from other method through
RequestFactory on the client-side, relationships, such as a List<MyProxy>
need to be explicitly retrieved, using syntax like:
requestFactory.formRequest().findForm(1).with('"fieldList").fire(...
http://code.google.com/webtoolkit/doc/latest/DevGuideRequestFactory.html#relationships
On Tue, Oct 18, 2011 at 3:52 AM, 007design <0...@007design.com> wrote:
> I'm trying to understand RequestFactory but having quite a difficult
> time. First, one note: I'm using ORMLite for persistence, I found it
> easier and simpler to learn than Hibernate so I'm hoping I can
> continue to use it. Those are the @Database annotations in example
> below. I've boiled down my application to a smaller amount of code.
> I'm really hoping someone can take a quick look at it and tell me what
> I'm doing wrong. When I try and load the application in the browser I
> get a NullPointerException on response.getFieldsList(). I'm guessing
> that after the Form object is fetched from the database the
> "connection is closed" or something so calling getFieldsList() doesn't
> work because the method "gets more data from the database".
>
>
> public class FormBuilder implements EntryPoint {
> public void onModuleLoad() {
> final Label label = new Label();
> RootPanel.get("labelContainer").add(label);
>
> final EventBus eventBus = new SimpleEventBus();
> EntityRequestFactory requestFactory =
> GWT.create(EntityRequestFactory.class);
> requestFactory.initialize(eventBus);
>
> requestFactory.formRequest().findForm(1).fire(new
> Receiver<FormProxy>() {
> @Override
> public void onSuccess(FormProxy response) {
> for (FieldProxy field :
> response.getFieldsList()) {
> label.setText(label.getText() +
> field.getName());
> }
> }
> });
> }
> }
>
>
> @DatabaseTable (tableName="forms")
> public class Form {
> public Form() {}
>
> @DatabaseField (columnName="form_id", generatedId=true)
> private Integer id;
> public void setId(Integer id) { this.id = id; }
> public Integer getId() { return id; }
>
> public List<Field> getFieldsList() {
> return Field.getFieldsList(getId());
> }
>
> public static Form findForm(Integer id) {
> // Get form record from database
> }
>
> }
>
>
> public class Field {
> public Field() {}
>
> @DatabaseField (columnName="field_id", generatedId=true)
> private Integer id;
> public void setId(Integer id) { this.id = id; }
> public Integer getId() { return id; }
>
> /**
> * The form to which this field is associated
> */
> private Integer formId;
> public void setFormId(Integer formId) { this.formId = formId; }
> public Integer getFormId() { return this.formId; }
>
> public Form getForm() {
> return Form.findForm(getFormId());
> }
>
> public static Field findField(Integer id) {
> // Get field record from database
> }
>
> public static List<Field> getFieldsList(Integer id) {
> // Get field records for db where formid = id
> }
> }
>
>
> @ProxyFor (Form.class)
> public interface FormProxy extends EntityProxy {
> Integer getId();
> List<FieldProxy> getFieldsList();
> void setId(Integer id);
> void setTimestamp(Date timestamp);
> }
>
>
> @ProxyFor (Field.class)
> public interface FieldProxy extends EntityProxy {
> Integer getFormId();
> Integer getId();
> void setFormId(Integer formId);
> void setId(Integer id);
> }
>
>
> @Service (Form.class)
> public interface FormRequest extends RequestContext {
> Request<FormProxy> findForm(Integer id);
> InstanceRequest<FormProxy, List<FieldProxy>> getFieldsList();
> }
>
>
> @Service (Field.class)
> public interface FieldRequest extends RequestContext {
> Request<FieldProxy> findField(Integer id);
> Request<List<FieldProxy>> getFieldsList(Integer formId);
> }
>
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