[Zope] external methods

[Pedro Vale Lima]

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???

yes, I guess your are 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)

Maybe It's self.l that causes the error. It's hard to understand what
you want, but I feel it should be

   for i in 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"

Maybe I can help you with this. The traceback you get is probably the
standard error raise in ExternalMethods. To debug external methods I use
try/except/raise code blocks and when I get an exception I return it to
the screen. Something like this

def mymethod(self):
    try:
	mycode
    except:
	import sys
	return sys.exc_type, sys.exc_value
    
    return something

pedro
--
Pedro Vale Lima
eq3pvl@eq.uc.pt