On 2/14/07, 23455432 <[EMAIL PROTECTED]> wrote:
I have a user object that contains many persons in a one-to-many bag
relationship.
The relationship is set up as follows:
// USER class
/**
* @hibernate.bag name="persons" lazy="false" cascade="save-update"
* @hibernate.collection-key column="user_id"
* @hibernate.collection-one-to-many class="org.appfuse.model.Person"
*/
public List getPersons(){.....
private Long userId;
/**
* @hibernate.property column="user_id"
*/
public Long getUserId(){
return userId;
So the person table has a user_id column that tells me what user the person
belongs to.
Whenever I edit the profile of the user, the persons disappear from the
users person list because in the DB the user_id column for the person gets
set to NULL. I am not sure why this is happening. I think it may be the
cascade options.
This happens likely because you're not holding the nested persons as
hidden fields. Since the form is in request scope, anything not in
hidden fields gets set to null. If you're not using Struts 1.x, other
frameworks have ways of repopulating the object before setting its
values from request parameters. If you're are using Struts 1.x, you
can put the form in the session, or programmatically refetch the
object from your database and reset the persons on your user.
Also, if I make changes to the user object, how can I get those changes in
the DAO, SERVICE and WEB layer without changing whats already there... using
appgen.
The DAO, Service and Web layers don't contain a whole lot of
fine-grained details about your User object. You should be able to
add/remove properties and make changes in your JSP. If you use a good
IDE and its refactoring capabilities, it should let you know when
changes need to be made in your Java code. If nothing else, the
existing unit tests should tell you if you broke something.
Hope this helps,
Matt
Any direction would be appreciated.
Thanks.
~rk
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