One-to-many relationship - remove item from collection problem

Question

The ArrayCollection keeps folders tree - subtree of folder is kept in children property and is also ArrayCollection. This collection is fed by 'folders' custom assembler defined like this:
Assembler works with adding and deleting top level objects of collection.
Also, when I add new object to children property LCDS issues createItem for new object and then updateItem for children property of parent so everything is fine - new object is persisted and relationship is correct.
When I remove item from children collection ONLY updateItem on assembler is issued, so object is not deleted from repository. Why this managed reletionship works for adding new object to children collection but doesnt work for deleting?

Answer 1

Hi;
A simple way may be create a view on referenced tables:
Connected to Oracle Database 10g Express Edition Release 10.2.0.1.0
Connected as hr
SQL>
SQL> drop table resources;
Table dropped
SQL> create table resources(id number, name varchar2(12));
Table created
SQL> insert into resources values(1,'Doc....');
1 row inserted
SQL> insert into resources values(2,'Img....');
1 row inserted
SQL> drop table documents;
Table dropped
SQL> create table documents(id number, resource_id number,type varchar2(12));
Table created
SQL> insert into documents values(1,1,'txt');
1 row inserted
SQL> drop table images;
Table dropped
SQL> create table images(id number, resource_id number,path varchar2(24));
Table created
SQL> insert into images values(1,2,'/data01/images/img01.jpg');
1 row inserted
SQL> create or replace view vw_resource_ref as
  2    select id, resource_id, type, null as path from documents
  3      union
  4     select id, resource_id, null as type, path from images;
View created
SQL> select * from resources r inner join vw_resource_ref rv on r.id = rv.resource_id;
        ID NAME                 ID RESOURCE_ID TYPE         PATH
         1 Doc....               1           1 txt         
         2 Img....               1           2              /data01/images/img01.jpg
SQL> Regards....