unidirectional, many to many relationship

pluellen May 22, 2002 10:40 PM

I'm trying to implement a unidirectional, many to many relationship and am running into problems.

I have two EJBs: User and Role. A User has many Roles and a Role has many Users. A User knows about its Roles but a Role does not know about its Users.

So, the User EJB has getter and setter methods for roles:

Collection getRoles()

and

setRoles(Collection roles)

However, the Role EJB has no corresponding getter and setter methods for its Users.

My question is this: What do I use for my <field-name> values for both sides of this relationship in my jbosscmp-jdbc.xml file? That is, there is no field for the Role EJB.

I can't seem to find an example anywhere.

Oh yeah, I'm using 3.0.0-RC3

Thanks for the help.

1. Re: unidirectional, many to many relationship

iflorescu May 23, 2002 8:36 AM (in response to pluellen)

You say you're trying to implement a undirectional relationship, therefore the Role EJB shouldn't have a users field and corresponding accessor methods. If you need the users field you should make your relationship bidirectional.

Hope this gives you some clue.
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2. Re: unidirectional, many to many relationship

pluellen May 23, 2002 11:39 AM (in response to pluellen)

Thanks for the help.

I had a misunderstanding about <key-fields><key-field><field-name> and what value(s) to use.

I've got it figured out now.
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