GWT on Rails : CRUDの'D'

ということでDashboard.javaを編集してみる．削除だ．．

app/gwt/dashboard/src/dashboard/client/Dashboard.java

//import類は省くが困ったらgwtのモノを選んどけばたいてい大丈夫
public class Dashboard implements EntryPoint {
    public void onModuleLoad() {
        final Button button = new Button("Click me");
        final Label label = new Label();
        button.addClickListener(new ClickListener() {
            public void onClick(Widget sender) {

//add 
    ResourceCollection projects = new RailsJsonResourceCollection(
      "/projects/", new ResourceFactory() {
       public Resource create() {
        return (Resource) GWT.create(Project.class);
       }
      });
    projects.find(1, new ResourceResponseHandler() {
     public void onSuccess(Resource resource) {
      Window.alert("Project(id=1) exists");
     }

     public void onError(Request request,
       Throwable exception) {
      Window.alert("Project(id=1) doesn't exist");
     }
    });
    ResourceCollection projects2 = new RailsJsonResourceCollection(
      "/projects/", new ResourceFactory() {
       public Resource create() {
        return (Resource) GWT.create(Project.class);
       }
      });
    projects2.delete(1, new StatusResponseHandler() {
     public void onSuccess() {
      ResourceCollection projects3 = new RailsJsonResourceCollection(
        "/projects/", new ResourceFactory() {
         public Resource create() {
          return (Resource) GWT
            .create(Project.class);
         }
        });
      projects3.find(1, new ResourceResponseHandler() {
       public void onSuccess(Resource resource) {
        Window.alert("Project(id=1) exists");
       }
       public void onError(Request request,
         Throwable exception) {
        Window.alert("Project(id=1) doesn't exist");
       }
      });
     }
     public void onError(Request request, Throwable exception) {
     }
    });
//add

                if (label.getText().equals(""))
                    label.setText("Hello World!");
                else
                    label.setText("");
            }
        });
        //slotは'app/views/dashboard/index.html.erb'内のidでの定義．
        //button, labelはそこにハマる．
        RootPanel.get("slot1").add(button);
        RootPanel.get("slot2").add(label);
    }
}

これはid=1のデータを削除する例．流れはまずid=1を取得し成功／不成功をalertで表示する．次にid=1のデータ削除を要求する．成功した際は，再度id=1の取得を試み成功／不成功をalertで表示する．

> rake dashbaord:compile
> script/server

ブラウザにて'http://localhost:3000/dashboard/'へアクセス