Re: many-to-many relationship

Fri, 02 Dec 2005 06:20:03 -0800

Is this a bug in WO?

I use these types of relationships all the time so I'm sure this is not a WO bug.

Given the relatively confusing nature of many-to-many relationships in WO, I created a small prototype project.  I use it to maintain consistency when building many-to-many relationships.  The project has examples of both flattened joins and exposed joins.

The project name is ManyToManyPatterns and can be found here:


On Dec 2, 2005, at 8:40 AM, Christian Telepski wrote:

Dear all,

i am stuck on a many-to-many relationship.

I have 'product' <->> 'prodcat' <<-> 'category', so this means flattened: 'product' <<->> 'category'

now always if i try to insert categories ina product i get following exception:

A valid global ID could not be obtained for entity named prodcat, relationship named categorys, primary key dictionary {proID = 1; catID = 1; }.

I have tried several ways, even without flattening the relationship.

Normally i would like to use a WOCheckBoxList on each product to set the categories. with selection: 'product.categorys'

I have set all necessary attributes like cascade delete rule, own destination and propagate primary key for both entities showing to the join table.

Is this a bug in WO?

If yes, how do i do it???

I have the newest Version of WO and xcode, maybe that is the problem...

Please help!

Thanks in advance Christian
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