[Zope3-Users] "has a" relationships

[Cliff Ford]

An alternative to including addresses in the ICompany/IPerson schemas 
would be to use Annotations. And you might also consider using a 
relational database. For me, the "add an Address Object" notion does not 
make much sense - either the address fields are part of the IPerson and 
ICompany schemas or they are not.

Cliff

Jachin Rupe wrote:
> hi there
> 
> I have another "zope theory" question.  I am working on designing a  
> application in zope.  I've been looking at a lot of examples and I am  
> wondering how people are implementing different types of  relationships 
> between different persistent objects.
> 
> For instance I am going to be doing a lot with addresses.  Naturally  it 
> would be nice to have persistent Address class.  Then I would say  that 
> a Person has an Address and a Company has an Address.
> 
> My two different ideas are as follows:
> 
> 1.  Make Person and and Company containers that can each contain an  
> Address.  I don't really like this idea because it seems like  container 
> objects are for things like folders.  This could be the  best way though 
> and I'm just not zoppie enough yet.
> 
> 2.  Add an Object for the Address to the schema for IPerson and  
> ICompany (assuming I only need one address) or a List / Dict (if I  want 
> more than one address for each person or company).  I like this  idea 
> better but I have yet to see any examples where someone does  that which 
> is making me a little nervous.   Among other things I'd  like to be able 
> to see what happens when "addform"s and "editform"s  get generated for 
> things like this or at least be assured that's the  way it is supposed 
> to work.
> 
> I just got my very own copies of the "Zope 3 Developers Handbook" and  
> "Web Component Development with Zope 3" (I'd suggest these books to  
> anyone by the way).  I have given each a once over as well as looking  
> at lots of shorter tutorials / examples online and have not noticed  any 
> example projects doing anything like my second idea.
> 
> So in your answer please feel free to point out something in either  of 
> those books (I may have missed) or refer me to some other online  
> example where something like this is going on.
> 
> thanks
> 
> -jachin
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