Hi Paul,
On Jun 26, 2007, at 3:46 PM, Paul Marvine wrote:
Hello,
This is a basic concept that I can't seem to get my brain to
understand.
I have an entity called "webView" with an attribute called
"headline".
When a user views a record and clicks a button (linked to an action
"doUpdates") I want to change "headline" and other attributes and
then save the record.
I've tried lines like...
webView.takeValueForKey("Hey, you clicked on the button", "headline");
That should work.
or
webViewDisplayGroup.selectedObject().takeValueForKey("Hey, you
clicked on the button", "headline");
and always seem to get a "can't resolve symbol" error on build.
That will give a build error. First off, we have a rule: no posting
about errors without including the exact text of the error and a
stack trace if there is one. Otherwise we are reduced to playing
guessing games and that gets tiring.
Second, read the error message. No, really, read the whole
thing. :-) I will guess that it says that "can't resolve symbol
takeValueForKey on Object". Which is, like, totally true.
java.lang.object does not have any takeValueForKey method.
WODisplayGroup.selectedObject() returns Object:
public Object selectedObject()
Provides the first object from selectedObjects.
You need to cast:
((WebView)webViewDisplayGroup.selectedObject()).takeValueForKey("Hey,
you clicked on the button", "headline");
But, honestly, that is freaking ugly and hard to read. Why not just
webView().setHeadline("Hey, you clicked on the button");
Or, if you want to take values that the user typed in:
(yes, that is right, no code. No that is not a typo).
Chuck
What is the correct way to do this.
Below is a simplified version of the page. The page works fine
except for the line in question.
//
// AdjustPagePreview.java: Class file for WO Component
'AdjustPagePreview'
// Project ContentDB
//
// Created by paul on 6/27/07
//
import com.webobjects.foundation.*;
import com.webobjects.appserver.*;
import com.webobjects.eocontrol.*;
import com.webobjects.eoaccess.*;
public class AdjustPagePreview extends WOComponent {
public WebView webView;
public WODisplayGroup webViewDisplayGroup;
public DeletePagePreview(WOContext context) {
super(context);
}
public WebView webView() {
return webView;
}
public void setWebView(WebView newWebView){
webView = newWebView;
}
public EditPage2 doUpdates()
{
EditPage2 nextPage = (EditPage2)pageWithName("EditPage2");
// webViewDisplayGroup.selectedObject() has an attribute of
"headline"
// I want to change this data to something different
// something like the line below
webViewDisplayGroup.selectedObject().takeValueForKey("Hey, you
clicked on the button", "headline"); // line in question
//this obviously doesn't work. What is the correct way to change
some of the attributes
// before it is saved?
this.session().defaultEditingContext().saveChanges();
nextPage.webViewDisplayGroup.setSelectedObject
( webViewDisplayGroup.selectedObject() );
return nextPage;
}
}
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