Re: Vertical Inheritance qualifier based on to many relationship
Re: Vertical Inheritance qualifier based on to many relationship
- Subject: Re: Vertical Inheritance qualifier based on to many relationship
- From: Chuck Hill <email@hidden>
- Date: Fri, 19 Aug 2011 16:26:36 -0700
On 2011-08-19, at 2:46 PM, Johan Henselmans wrote:
> My idea:
>
> I have an entity contact, that gets vertically inherited into actor, employee, visitor, nicepersontoalwayinviteforfreetoanyshow, whatever, based on the role somebody/thing plays.
>
> A contact can have different roles, which makes this contact playing actor, employee, visitor, nicepersontoalwayinviteforfreetoanyshow or whatever. So there is a m-n relation roles in a contact.
Where is Kieran? This is his favourite question. It sounds like you should be using the Role pattern and not inheritance.
http://objectdiscovery.com/solutions/publications/roles/index.html
> I assumed that I should be able to create and get a visitor if I could describe in the EOModel qualifier something like roles.ROLE.name = 'visitor'
>
> Something like this:
> <PastedGraphic-3.png>
> And I would create the relation to the role in the awakeFromInsertion phase of the Visitor.
>
> Of course this is not working, (nothing ever works where I live) as I am getting
>
> takeValueForKey(): attempt to assign value to unknown key: 'roles.ROLE.name'. This class does not have an instance variable of the name roles.ROLE.name
>
>
> What is the proper incantation to do this?
I think that is not possible. The restricting qualifier has to be evaluated on that single entity only.
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects
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