[Zope-dev] relations in objects

[Jason Corbett]

Thanks for your reply.  I've actually been thinking in
an object oriented form for a while.  I've looked at
implimenting this project in Java using either
prevailance or a object persistence model that mapped
to a RDBMS.  I like the idea of zope, so maybe I
should clarify my question:

How does an object in zope know where it sits in the
hirearchy, and how does it reach other objects. 
That's what I'm really looking for, I can probably
code the rest of the parts.

Jason Corbett


--- mlong at datalong.com wrote:
> Hi Jason,
> 
> I am not a zope developer, I am a semi-new user who
> started with zope
> coming from the same mindset as yourself. One of the
> biggest challanges(at
> least for me) is to wrap your mind around object
> oriented programming. The
> zope database is an object oriented database. This
> means that you will
> want/need to design your product differently than if
> you were using
> mysql/php to present and store your data. Think of
> the information you
> want to track as real world objects, and it is. Then
> think about how these
> real world objects relate to one another. You will
> start to see a pattern.
> Use this pattern to create a hierarchical
> folder(object) structure. This
> structure along with python's object inheritance
> will allow you to develop
> your relationships. Play with zope. Write your
> product. Discover that you
> need to rewrite your product because you did not
> understand some
> fundamentals. Complete the rewrite. Rinse and repeat
> until you get it
> right.
> 
> Cheers,
> Mike
> 
> > Hello Zope developers,
> >
> >   I'm a newbie (sorry most people have this curse
> at
> > one point or another).  I have read the zope book
> (or
> > at least most of it), and the zope developer
> manual.
> > I can't quite figure out how to have relationships
> > between instances of classes in the database.
> >
> >   Let me first ask if I'm using zope for the
> correct
> > thing.  I see that a lot of zope products deal
> with
> > content management, while mine doesn't really.
> > Basically I want to do what I would normally do
> with
> > mysql and php, but use zope instead.  So I need a
> way
> > to reference in some intelligent way between
> objects
> > in zope, and I need a way to query for a list of
> them.
> >
> >   I read about ZCatalogs, etc and how you can use
> that
> > for querying and indexing.  That isn't my first
> > priority, so I'll worry about that a little later.
> >
> >   Basically I have an instance of a class 'A'.  As
> > part of it I need to reference either a single or
> in
> > some cases multiple instances of class 'B'. 
> Basically
> > I'll have a mix of one-to-one relations and
> > one-to-many.  When I'm coding my python class (I'm
> > going to do a product if you can't tell), how
> would I
> > get a list of the 'B' instances that relate to
> this
> > object, and how would I store that?  The zope
> > developer manual was pretty good for writing
> classes,
> > and making views on it, but I need to be able to
> call
> > methods on those instances and return lists of
> them.
> >
> >   Sorry for the long email, I just don't want to
> leave
> > details out.  If you think I'm barking up the
> wrong
> > tree, and shouldn't be using zope for this, don't
> be
> > afraid to let me know.  Although I will be pretty
> > disappointed, I think zope is exactly what I've
> been
> > looking for, I can't find anything like it in any
> > other language.
> >
> > Jason Corbett
> >
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> 


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