[Zope-dev] Re: ZClassNG and ProductNG proposal

[Martin Aspeli]

Christopher Lozinski wrote:
> I think I have figured out how to do it.   This looks like a ZMI based 
> ZClass, you can define it through the ZMI, you can add instance 
> variables, you can add instance methods, all through the ZMI,  but you 
> can change inheritance, because it is really a product created on the 
> file system.

If there is such an easy translation from ZMI-based ZClass to filesystem 
product, then why not write the filesystem product in the first place?

> Check out the proposal.
> http://wiki.zope.org/zope2/ZClassesNGAndProductNG

... the names ZClassNG and ProductNG (especially the latter) are bad, to 
begin with, but oh well. You wouldn't be the first. :)

You're assuming there is an obvious one-to-one mapping between ZClass 
syntax and non-ZClass products on the filesystem, which may or may not 
be true.

You're relying on code generation, so you'll run into trouble when the 
two versions (ZODB and filesystem) diverge for whatever reason (someone 
edited the code, say).

Also, Zope needs a restart to load a new product, which will mess with 
the workflow.

But the bigger picture here is that an awful lot of people are telling 
you that spending your time on this is a bad idea, that you'll probably 
find it more difficult than you imagine, and that if you are going to 
invent new things, your time may be better spent pulling the same 
direction that most other people are.

By all means, give it a go, but you will probably find it difficult to 
get help when you are stuck because (a) no-one else seems to care and 
(b) not many other people seem to even know how this should work.

Martin