How can I set a VO Attribute value ?

Question

Hi,
I'm relatively new to developing OA framework pages, so apologise in advance if my terminology is not quite right at the moment. But I have an experienced Oracle Forms developer so am getting to grips with new tools.
I've managed to develop a number of simple pages (query page and create single record page). I now want to develop a simple "master-detail" page. I've created a page that has two regions Header region and Lines region. Region styles are set to Header and AdvancedTable (child of Header region). I created some test data in TOAD and have written the code to query back the header and related lines. This works and the correct lines get displays when a new header record is displayed. I coded this in the initQuery methods. But now I'm stuck trying to create detail/line rows from the page.
I've added the "Add New Rows" to and want to populate the Lines row with the value of my parents primary key (eventually I'll make the child fkey column hidden). For the last few days, I've read lots of forum notes and the OA dev guide. At the moment, I've created a CO on my Lines region and this basically does the following in the processFormRequest :-
a) Traps the Add Rows Event
b) Fetches the current row for the parent and parent Id (primary key)
c) Fetches the current child row
d) Tries to update the child foreign key attribute using parent's primary key.
When I pressed the Add Rows button I was getting an error "Attribute set <attribute> failed for ...>.
I read various notes suggesting that I did not have my EO and VO properties set for the attribute I was updating. So I changed the EO and VO to allow the attribute to always be updateable. Now I don't get the error, but the column is not populated. An empty row appears. I used the messaging and am definately getting a value in the parentKey variable.
I know I'm in the Add Rows event because I manged to display some dummy messages.
Below is the code in my Lines CO processFormRequest :
OAAdvancedTableBean tableBean = (OAAdvancedTableBean) webBean.findChildRecursive("RoutesRN");
if (tableBean.getName().equals(pageContext.getParameter(SOURCE_PARAM))
&& ADD_ROWS_EVENT.equals(pageContext.getParameter(EVENT_PARAM)))
OAViewObject parentVO = (OAViewObject)am.findViewObject("XXRPAirlineCreateVO1");
OARow parentRow = (OARow)parentVO.getCurrentRow();
String parentKey = (String)parentRow.getAttribute("CompCode");
OAViewObject childVO = (OAViewObject)am.findViewObject("XXRPRouteFullVO1");
OARow childRow = (OARow)childVO.getCurrentRow();
//String childFKey = (String)childRow.getAttribute("CompCode");
//childRow.setAttribute("CompCode",parentKey);
childRow.setAttribute("CompCode",parentKey);
///// String message = "Pressed Add Rows Button Parent = " + parentKey + " Child = " + childFKey;
/// // throw new OAException(message, OAException.INFORMATION);
I guess the above may not be the best way to the "copy" of a parent id into a child foreign key.
Any help would be really appreciated.
Thanks
Ramnik
The region style for the Header

Answer 1

Look in the dev guide, Tables --> Adding rows.
If you are handling the add row event, you need to set autoInsertion off. You need to create a row in the child VO and then set the desired attributes