Yup. I have not looked at the docs but the 2 keys are, .. the spec must
be 2.x and the relation tags are at the method level and the name
attribute must match to get a bi-directional relationship
Ara Abrahamian wrote:
> May I go back in time and reopen an old discussion?
>
>
>> > Anyway, the syntax looks ugly to me, what about this syntax:
>> > @ejb:relation name="Customer_Orders" target-ejb="ejb/Order"
>> > multiplicity="One|Many"
>> > And we can make it smart: if type=Collection -> multiplicity=Many,
>> > otherwise One.
>> >
>>
>>target-ejb is only required for unidircetional relationships
>>
>>I like the part of the multiplicity being automatic but it would still
>>have to be there for unidirection relationships (target-multiple)
>>
>>On second throught that is tough for 1 to many because the roles are
>>reversed. The many goes on the side that has 1 defined and the one
>>
> goes
>
>>no the side that has the collection. You would have to be able to look
>>at the other side of the relation to determine multiplicity. You would
>>need both isA and isNotA code
>>
>>public booelan isRelationACollection() {
>> if(curRelation.left == getCurrentClass())
>> // check type of curRelation.rightMethod ,
>>Collection,Set
>> else
>> // check type of curRelation.leftMethod
>>}
>>
>
> Let's summarize it:
> - If unidirectional (meaning a RelationHolder with left/leftMethod=null
> or right/rightMethod=null)-> look at the target-ejb (target-ejb is
> mandatory)
> - if leftMethod.returnType=Set|Collection -> multiplicity for
> target-ejb=many
> - else -> multiplicity for target-ejb=One
>
> - If bidirectional ->
> - If leftMethod.returnType=Set|Collection -> multiplicity for
> right=many
> - Else -> multiplicity for right=one
>
> Right? Seems ok to me.
>
> Ara.
>
>
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