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Re: Many-to-many question ...
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Re: Many-to-many question ...


  • Subject: Re: Many-to-many question ...
  • From: Lachlan Deck <email@hidden>
  • Date: Fri, 26 Oct 2007 09:49:28 +1000

On 25/10/2007, at 7:37 PM, Daniele Corti wrote:

> 2007/10/25, Lachlan Deck <email@hidden>:
>> You have two choices with M2M Join tables.
>> A<-->>AB<<-->B
>>
>> 1) flatten the relationships... so that you're adding to both sides
>> of relationship two records on either side of the join. Join records
>> using EOGenericRecord and don't have any logic in them.
>>
>> A myA = (A)EOUtilties.createAndInsertInstance(ec, "A");
>> B myB = (B)EOUtilties.createAndInsertInstance(ec, "B");
>> myA.addObjectToBothSidesOfRelationshipWithKey(myB, "bs");
>
> How this work? Do you need to set the EOmodel in some way?


Flattening relationships involves creating a many-to-many join like
here:
http://wiki.objectstyle.org/confluence/display/WOL/Creating+a+Many+to
+Many+Join

Thank you, but is there a way in EOModeler? (really, I've never completely understand how to user Entity Modeler)

Sure.
1) Select two entities (make sure you've given them a primary key each, an entity name, external name)
2) Choose Property > Join in Many to Many
3) make sure join entity has its external name and entityName as desired.


The concept in Entity Modeler is similar - but far less buggy.... i.e., select two entities, right-click, choose New Relationship... and follow the prompts. I really suggest that you jump over to using WOLips now. Really, the water is fine, there's lots of help available.

> 2) don't flatten the relationships

Otherwise, create normal toMany relationship from A to AB, and B to
AB in the modeler.

Usually I use this , but I like to continue learning new way to do things ;-P

with regards, --

Lachlan Deck



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  • Follow-Ups:
    • Re: Many-to-many question ...
      • From: "Daniele Corti" <email@hidden>
References: 
 >Many-to-many question ... (From: "Shagor Ghani" <email@hidden>)
 >Re: Many-to-many question ... (From: Lachlan Deck <email@hidden>)
 >Re: Many-to-many question ... (From: "Daniele Corti" <email@hidden>)
 >Re: Many-to-many question ... (From: Lachlan Deck <email@hidden>)
 >Re: Many-to-many question ... (From: "Daniele Corti" <email@hidden>)

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