Re: [Zope] external methods

26 Mar 1999

      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?



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