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Duplicate entry [ was addObjectsToBothSide... not really both side]
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Duplicate entry [ was addObjectsToBothSide... not really both side]


  • Subject: Duplicate entry [ was addObjectsToBothSide... not really both side]
  • From: Dev WO <email@hidden>
  • Date: Thu, 28 Sep 2006 01:23:53 +0200

Hi,
I though everything was good with my oneToOne (pk to pk) relationship, but not completely in fact.


So A and B have a relationship joining their pk.

But B can be "alone", which means I can have B object without A object.

So it happens that sometimes, when creating a A object (which will create the B object at the same time as the relationship is created) and trying to save it, A got a primary key already used by B which lead to a crash...

Is there a way to get the primary form the B object instead of the A object? (B pks are always good as I cannot have an A object without a B)

Thanks:)

Xavier


I've setup my onetoone on both pk and everything is good:)

Thanks a lot:)

I'll wait for tomorrow for the next question;)


Xavier

You really need to set both directions - EOF will not do it for you.

On Sep 26, 2006, at 3:38 PM, Dev WO wrote:

Hi zak,
Dev WO wrote on 9/25/06 1:26 PM:
So this one is a oneToOne relationship, with is specified in both
entities A and B.

[...]

A and B have a foreign key to each other, but only A gets it... B's
foreign key stay "null".

I think you may not be modeling the relationship correctly. If you
really want a 1-to-1, A and B should share the same primary key and A
should be propagating its primary key to B.


If both tables have their own primary keys, and both have foreign keys
to each other, things don't really stand up from a relational logic
point of view because you actually have two relationships -- A is joined
to B by by A.b_id and B is joined to A by B.a_id.


Assuming that A.setB() is defined in terms of A.b_id, the reason B.a_id
doesn't update is that B.a() is defined by B.a_id but the relationship
you just set is defined by A.b_id. You have two separate relationships
based on two separate keys.

HUUUUUU I feel stupid...not the first time though, and probably not the last one too;)


In my case, B can exist alone (without any A to relating to it), but A cannot exist alone, it must be linked to a B.

Does this change anything?
I'll try to make the relationship between pks.

Thanks:)

Xavier

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  • Follow-Ups:
    • Re: Duplicate entry [ was addObjectsToBothSide... not really both side]
      • From: Chuck Hill <email@hidden>
    • Re: Duplicate entry [ was addObjectsToBothSide... not really both side] [SOLVED]
      • From: Dev WO <email@hidden>
References: 
 >addObjectsToBothSide... not really both side (From: Dev WO <email@hidden>)
 >Re: addObjectsToBothSide... not really both side (From: Zak Burke <email@hidden>)
 >Re: addObjectsToBothSide... not really both side (From: Dev WO <email@hidden>)
 >Re: addObjectsToBothSide... not really both side (From: Ken Anderson <email@hidden>)
 >Re: addObjectsToBothSide... not really both side (From: Dev WO <email@hidden>)

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