Re: Duplicates in to-many relationships

From: Alexander Lamb (dev) ("Alexander)
Date: Tue Jun 19 2007 - 15:14:14 EDT

  • Next message: Kevin Menard: "RE: Duplicates in to-many relationships"

    Thanks a lot. It is again my WO habit where we did the
    "addToBothSidesOfRelationshipWithKey" !

    Works fine now!

    Alex

    Le 19 juin 07 à 18:17, Mike Kienenberger a écrit :

    > And note that if you call
    > "myFirstObject.addToMyRelation(mySecondObject)", then
    > "mySecondObject.setTheObject(myFirstObject)" is also called. It
    > doesn't matter which side of the relationship you call. Furthermore,
    > if mySecondObject.getTheObject() = myZeroObject beforehand, this
    > object will also be removed from the relationship list automatically.
    > Ie, everything "just works" out of the box with no extra effort on
    > your part.
    >
    > On 6/19/07, Mike Kienenberger <mkienen..mail.com> wrote:
    >> Unlike Hibernate, the object graph is maintained even before you
    >> save.
    >>
    >> If you use "mySecondObject.setTheObject(myFirstObject)", then the
    >> equivalent for "myFirstObject.addToMyRelation(mySecondObject)" is
    >> already done for you.
    >>
    >> This is why you're seeing two copies -- you're effectively calling
    >> the
    >> addToMyRelationship twice.
    >>
    >>
    >>
    >> On 6/19/07, Alexander Lamb (dev) <alam..ac.com> wrote:
    >> > Hello list,
    >> >
    >> > It looks like "myFirstObject.addToMyRelation(mySecondObject)" does
    >> > not check if mySecondObject is already in the relationship. Is that
    >> > correct?
    >> >
    >> > If so, here is my problem.
    >> >
    >> > I know that I can simply do:
    >> >
    >> > mySecondObject.setTheObject(myFirstObject)
    >> >
    >> > and then once saved, somehow the reverse relationship will be
    >> updated.
    >> >
    >> > The problem is that I need the reverse relationship before I save.
    >> > Therefore I do:
    >> >
    >> > mySecondObject.setTheObject(myFirstObject)
    >> >
    >> > and
    >> >
    >> > myFirstObject.addToMyRelation(mySecondObject)
    >> >
    >> > In order to have my object graph correct before save.
    >> >
    >> > Unfortunately, doing this it seems like mySecondObject gets
    >> inserted
    >> > twice in the List. If I restart the app, everything is fine again.
    >> >
    >> > Thanks for any hint!
    >> >
    >> > Alex
    >> >
    >>

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