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Hi again;
I've just realised how I should do what I'm looking for :
The fetch should be :
((a = $someA) and (b = $someB))
instead of going through the keys as in
((FK_A_id = $someA.A_id) and (FK_B_id = $someB.B_id))
Indeed I guess I'm just too much used to SQL, and tend to forget the
beauty of EOF...
Serge.
Le 10 juil. 07 à 13:30, Serge Cohen a écrit :
Hello list;
I have the following model, made of 3 entities (A, B, C, plus some
other entities which link to C).
A and B have PK A_id and B_id (plus other fields, irrelevant to the
question). They are both linked to C by a to-many relationship (the
reverse is a to-one relationship) :
C contains foreign keys for linking to A and B, it has its own key
(C_id) because I need to link other entities to C.
In short (if the attachment goes through) here is what I (would
like to) have :
<pastedGraphic.png>
The problem I have is that when I'm given a A and a B, I'd like to
be able to retrieve the C(s) corresponding to this pair.
To do that I have a fetch (on C) with representation string :
((FK_A_id = $someA.A_id) and (FK_B_id = $someB.B_id))
When I have all this set this way, the fetch is throwing an
exception :
Error:
com.webobjects.foundation.NSKeyValueCoding$UnknownKeyException:
valueForKey(): lookup of unknown key: 'A_id'. This class does not
have an instance variable of the name A_id or _ A_id, nor a method
of the name A_id, _A_id, getA_id, or _getA_id
Reason:
<A 0x267610> valueForKey(): lookup of unknown key: 'A_id'. This
class does not have an instance variable of the nameA_id or _ A_id,
nor a method of the name A_id, _A_id, getA_id, or _getA_id
Indeed the only solution I've found so far to avoid this type of
exception is to give accessors to all the primary keys/foreign keys
involved in the fetch.
Now, none of the these keys are compound keys, so I'd rather avoid
having accessors to them, so I am wondering if there is a solution
to get the same functionality but without giving accessor to the keys.
Thanks in advance.
Serge.
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