[Zope3-Users] Custom addform and object creation error

[Cliff Ford]

To answer my own question, and for the benefit of anyone else who wants 
to customise an addform:

Even though I have a class with a createAndAdd method I found that it 
was necessary to include the content_factory directive in the addform 
configuration as well as the class and template directives.

I copied the createAndAdd method from ../zope/app/form/browser/add.py 
and added this line: self.gotoURL = str(content.__name__) after content 
= self.add(content), having previously set gotoURL='' as a class 
variable. I have a nextURL method:

def nextURL(self):
     return '../%s' % self.gotoURL

And lo and behold on submission of the add form I get the browser view 
of the added object. Magic!

I am doing this customisation because I want to collect essential Dublin 
Core data with data for the content object, rather than rely on users 
filling in the metadata form later.

Cliff


Cliff Ford wrote:
> I have a custom addform that works fine with a standard configuration. 
> However, on submission it redirects to the contents view of its 
> container and I want it to redirect somewhere else, such as the new 
> object's edit or metadata views. All I really need is a nextURL 
> configuration directive, mentioned in mailings some time ago, but I 
> don't think that has been implemented.
> 
> I have created a class with a __call__ method that returns the custom 
> form template, and a nextURL() method. In the configuration file I have 
> replaced the content_factory directive with the class directive.
> 
> With the custom form and class, the form displays and field validation 
> still works, but with valid fields I get an object creation error:
> 
> File "/usr/local/Zope3/src/zope/app/form/browser/add.py", line 71, in 
> create
>     return self._factory(*args, **kw)
> TypeError: 'NoneType' object is not callable
> 
> I have looked at the add.py module and am none the wiser. I guess I have 
> neglected to set something somewhere, may be context related. Can anyone 
> enlighten me? The custom class has almost nothing in it (see below) so I 
> am surprised it gets as far as it does. [I have also searched the 
> archives and read both recent Zope3 books but can't find an answer.]
> 
> Cliff
> 
> Custom class:
> 
> from zope.app.pagetemplate.viewpagetemplatefile import ViewPageTemplateFile
> 
> class PageAddFormD:
>     """This class reads the form data and creates a custom Page"""
> 
>     template = ViewPageTemplateFile('pageaddformd.pt')
> 
>     def __call__(self):
>         return self.template()
> 
>     def getInterfaces(self):
>         """ Don't know if I need this here """
>         return implementedBy(GlgPage)
> 
>     def nextURL(self):
>         """ return the next place to go """
>         # have not got this far yet
>         return '../'
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