[Zope] AW: [Zope] external methods

[Stefan Franke]

Hi Jepthe,
First, if you want to acces the REQUEST object, you need 
to declare it as a formal parameter:

def myExtMethod(self, REQUEST): ...

REQUEST is then passed automatically by Zope's internal
magic, which looks up formal parameter names and matches
them to arguments from HTML forms, HTTP Headers, etc.

The "read only class, buffer" traceback is due to a very 
annoying bug in ExternalMethod.py and screws up any 
other error messages in external methods.

I can't remember exactly if it was in line 254 or 256 in
ExternalMethod.py, but here's the code I use to fix it:

ExternalMethod.py, from line 254

                if type(error_type) is type('') and lower(error_type) in
('redirect',):
                    raise error_type, error_value, tb
                if (type(error_value) is type('') and
                    regex.search('[a-zA-Z]>', error_value) > 0):
                    error_message=error_value
                else:
                    error_message=''

With that you should get better error messages.

Regards,
Stefan

PS:
	<!--#var myExtMethod-->
	<!--#var "myExtMethod()"-->
should be both OK


Service Informatique CHSR wrote:
> Hello,
> 
> I'm confused with external methods. Please help.
> 
> I want an external method to access its context (for the
> purpose of acquisition, etc.). So I write:
> 
> def myExtMethod(self):
>     pass
> 
> Within myExtMethod, I should be able to:
> - write self.REQUEST to access the current REQUEST object (I
> need to be able to modify the current REQUEST object with
> self.REQUEST.set(...))
> - or for example self.myzsqlmethod() to call a zsql method object,
> right???
> 
> Let's suppose that myExtMethod is:
> 
> def myExtMethod(self):
>     l=[]
>     for i in self.l:
>         l.append(i+1)
>     self.REQUEST.set('l', l)
> 
> Now, how can I call this method from DTML?
> 
> <!--#var myExtMethod-->
> <!--#var "myExtMethod()"-->
> <!--#var "myExtMethod(this())"-->
> 
> All don't work. I end up in a traceback. "read only class, buffer"
> 
> Any hints?
> 
> Jepthe CLAIN
> Service Informatique CHSR
>