Many to many displayed in list

I'm developing a file manager where files have titles, descriptions, and subject categories amongst other things. File -> Subjects is a many to many relationship, linked by a file_subject table.
I have successfully used the Many to Many Wizard to make the edit/update detail form work - which provides a Nested Repeat Region showing all subjects as checkboxes.
Now I need to be able to display a list of all files, with one field listing all the many subject categories that a particular file belongs to. Is there a way to do this in ADDT? I can make a list with a nested repeat region showing the link table subjects, but don't know how to translate those to display values from the actual subject table. Does that make sense?
Any assistance much appreciated.

Hi Mick,
with one field listing all the many subject categories that a particular file belongs to
how do you store all those "subjects" in your comma-separated column, the "subject_id" I reckon ?
However, you might want to read my little "Query-Tipp: extract 1 value from comma-separated list" tutorial I posted at the Interakt forums:
http://www.interaktonline.com/Products/Dreamweaver-Extensions/MXWidgets/Product-Forum/Deta ils/54511/Query-Tipp%3A+extract+1+value+from+comma-separated+list.html
Maybe this is what you´re looking for...
Cheers,
Günter Schenk
Adobe Community Expert, Dreamweaver

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<Another attempt to post a reply. >
Could JDev Team please provide a BC4J/JClient sample
that performs the following task:
The dialog should use A_TABLE as master and AB_TABLE
as detail. The detail displays the names associated
with the IDs. Next to AB_TABLE should be a view of
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not in AB_TABLE. Two buttons are used for adding and
removing rows in AB_TABLE. After adding or removing
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updated. The whole thing should work in the middle
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query reexecution for B_TABLE until commit/rollback.
This is a very common szenario: For an item group
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Most of JDeveloper4s wizards use this. They can
handle multi/single selections, selections from
complex structures like trees and so on. Ok, the
wizards are not based on BC4J - or? How can we do it
with BC4J?
Our main problems are:
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reflecting the current selectionYou should be able to use insertRow() to insert the row into proper collection.
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2. A good strategy for displaying the names instead
of the IDs (subqueries or joining the three tables)You should join the three tables by using reference (and perhaps readonly) entities.
3. A JBO-27101 DeadEntityAccessException when
removing an existing row from AB_TABLE and adding it
againThis is happening due to remove() method on the Row which is marking the row as removed. Attempts to add this row into another collection will throw a DeadEntityAccessException.
You may 'remove the row from it's collection, then call 'Row.refresh' on it to revert the entity back to undeleted state.
>
Other problems:
4. We get a JBO-25030 InvalidOwnerException when
creating a row in AB_TABLE. This is caused by the
composition. We workaround this using
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(instead of create()). This is our add-Action:
ViewObject abVO =
O =
panelBinding.getApplicationModule().findViewObject("AB
iew");
ViewObject bVO =
O =
panelBinding.getApplicationModule().findViewObject("BV
ew");
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new String[]{"BId"}, new
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Object[]{bRow.getAttribute("BId")});
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abVO.insertRow(newRow);This is a handy approach. Note that Bc4j framework does not support dual composition where the same detail can be owned by two or more masters. In those cases, you also need to implement post ordering to post the masters before the detail (and reverse ordering for deletes).
>
5. After inserting the new row the NavigationBar has
enabled commit/rollback buttons and AB_TABLE displays
the row. But performing a commit does nothing. With
the following statement after insertRow(newRow) the
new row is created in the database:
newRow.setAttribute("BId",
d", bRow.getAttribute("BId"));This bug in JDev 903 was fixed and a patch set (9.0.3.1) is (I believe) available now via MetaLink.
>
>
Please give us some help on this subject.
Best regards
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