Editing Attributes on the Links of Change Relationship Tables

Did you check out the Tips and Tricks from JeffZemsky

I've gotten part of the way through this but am still having problems with the form delegate. I can enter a value in a textbox for my string attribute on the change task editing page, so it seems like my data utility is working. But once I select finish, the value entered isn't persisted back to the Change Task. I wrote a form delegate and registered it using the wt.properties property com.ptc.netmarkets.util.misc.defaultActions as described in the help. This seemed like the better-documented part of the example, but I can't get it to work.

package ext.change;

import com.ptc.windchill.enterprise.change2.forms.delegates.ChangeTaskAffectedItemsFormDelegate;
import wt.change2.ChangeItemIfc;
import wt.fc.collections.WTCollection;
import wt.util.WTException;
import com.ptc.windchill.enterprise.change2.ChangeLinkAttributeHelper;
import com.ptc.windchill.enterprise.change2.beans.ChangeLinkAttributeBean;
import wt.util.WTPropertyVetoException;
import com.ptc.core.meta.common.UpdateOperationIdentifier;
import com.ptc.core.lwc.server.PersistableAdapter;
import wt.change2.WTChangeActivity2;
import wt.change2.ChangeRecord2;
import com.ptc.windchill.enterprise.change2.ChangeManagementClientHelper;

import java.util.Iterator;

public class MyAffectedItemsFormDelegate extends ChangeTaskAffectedItemsFormDelegate {

 /**
 * This method is used to post-process attributes on the change activity
 * and change records. 
 */
	@SuppressWarnings("unchecked")
	@Override
	protected WTCollection processLinkAttributes(ChangeItemIfc item, WTCollection binaryLinks) throws WTException {
		WTCollection modifiedLinks = super.processLinkAttributes(item, binaryLinks);
		if (binaryLinks != null && !binaryLinks.isEmpty() && item instanceof WTChangeActivity2) {
		 // The link bean has knowledge of how of link attributes and supports the JCA interfaces.
		 ChangeLinkAttributeBean linkBean = ChangeLinkAttributeHelper.getChangeLinkAttributeBean();
		 linkBean.setFormData(getObjectBean());
		 for(Iterator<ChangeRecord2> iter = binaryLinks.persistableIterator(ChangeRecord2.class, true); iter.hasNext(); ) {
			ChangeRecord2 record = iter.next();
			// The getTableDataValue() will get the attribute from the FORM data supporting any specific change table handlers
			String value = ChangeLinkAttributeHelper.getTableDataValue("estimated_cost", 
					ChangeManagementClientHelper.getReference(record.getChangeable2()), linkBean);
			// The new LWC API for getting and setting attributes.
			PersistableAdapter lwc = new PersistableAdapter(record, null, null, new UpdateOperationIdentifier());
			lwc.load("estimated_cost");
			Object currentValue = lwc.get("estimated_cost");
			// Only set the attribute if it is different than the current value
			if(( value != null && currentValue != null && !value.equals(currentValue.toString())) || (value == null && currentValue != null) ) {
			 lwc.set("estimated_cost", value);
			 lwc.apply();
			 // calling apply() will require verification, however since this form delegate is setting the changes we can set it as verified.
			 try {
				record.getPersistInfo().setVerified(true);
			 } catch (WTPropertyVetoException e) {
				e.printStackTrace();
			 }
			 modifiedLinks.add(record);
			}
		 }
		}
		return modifiedLinks;
	}
}