thanks for the quick responce martijn. ive gotta better grasp of the concepts now, but yea the implementation makes my head spin a bit. i´ll begin to investigate using what you´ve laid out here as a guide. i´ve joined the grok-dev list.
El jue, 28-02-2008 a las 00:19 +0100, Martijn Faassen escribió: > Hi there, > > I haven't had much experience with blobs yet (I hope to start working > with this in the near future). > > >From my reading of the blobfile docs, I think the "File" object > defined in it is *not* a schema field, such as the > one you use from megrok.form. These things are different things > altogether, even though they're both called file. > blobfile tries to make its File object compatible with the file object > stored by the zope.app.file package. This is the > implementation of an object that *stores* the file data, not the field > that appears in the schema. From my cursory browsing > through z3c.blobfile it doesn't implement such a file field. > > So, concept involved: > > * the File field in a schema > > * the actual object that ends up on your Python object, a File object > (altogether different, just same name). This stores your > file in some way, by default in the ZODB, but now we want to use the > blob version. > > * the widget that displays this field in a form. > > I think unfortunately some custom work seems necessary to hook this > up. megrok.form uses collective.namedfile for its file upload widget. > Collective namedfile defines a field and widget for the file. Glancing > at it, I don't think it's much code, but we do need: > > * a special 'BlobFile' field that stores the information in the ZODB > > * probably a BlobNamedFile storage object that subclasses from the > existing blobfile File object, but adds a filename (which the named > file bits need) > > * a new BlobNamedFileWidget widget that subclasses NamedFileWidget > and creates a BlobNamedFile instead of a > NamedFile. With a few tweaks to collective.namedfile we could make > this widget subclass really minimal, just introducing > a file object factory in it or looking up some utility or adapter to > configure it, but even without that, it's going to be short. > > I expect that all this is probably a bit intimidating for you to get > done yourself, but luckily there's help. I think this might make for a > good addition to megrok.form, which we're interested in expanding. I > think it makes sense for us to add blob file support in there along > the lines of what I sketched out above. Please join us in grok-dev and > we'll try to work it out with you. To start this off, I've cc-ed it > into that list as well as the developer of megrok.form. > > Regards, > > Martijn _______________________________________________ Zope3-users mailing list Zope3-users@zope.org http://mail.zope.org/mailman/listinfo/zope3-users
