-> Instead of creating a Product, you can just put an External Method in the
-> root of your site.
A couple of weeks ago, I asked about customizing the default Zope
"type" when a file is uploaded with either WebDAV or FTP. For example,
I want ".html" files to be a ZopePageTemplate instead of a DTML Document,
which is the default.
Ron gave me the excellent suggestion of creating an "External
Method" that looks like the following:
-> def PUT_factory(self, name, typ, body):
-> """Make Page Template the default type for ftp uploads."""
-> from Products.PageTemplates.ZopePageTemplate import ZopePageTemplate
-> if typ == 'text/html':
-> return ZopePageTemplate(name)
-> return None
Since then, I've done some learning, and now I'd like to
understand exactly *why* Ron's external method works.
I'm creating a Zope Product that will introduce a new Zope "type"
called "MIME Remapper". This "MIME Remapper" will be a ZClass that has a
single property sheet, which allows you to associate particular MIME types
with particular Zope "types" using a nifty text field and dropdown.
The problem is, I don't understand why Ron's suggestion actually
works. I assume that the method PUT_factory() is over-riding the built-in
default, and when it returns None (for an unknown MIME type), Zope --for
some magical reason-- falls back to its built-in PUT_factory() to figure
out the MIME type. Is that right?
Now, does that mean that the only way to override PUT_factory() is
via an external method? If so, why is that? If not, can I create a new
ZClass that has a method called PUT_factory()? Will a new instance of my
ZClass mean that PUT_factory() is overridden for the folder the instance
is in? If so, then why is Zope finding the PUT_factory() of my new "MIME
Remapper" type when it actually wants the PUT_factory() for the folder
that I'm in? Do I need to redefine the PUT_factory() of the instance's
folder? How do I do that?
Obviously, I'm confused. I feel like this particular problem will
give me good insight into how Zope works, so I'd love an explanation of
why Ron's PUT_factory() works. (FYI, I understand class inheritance,
just not within the Zope framework.)
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