faq.txt

= FAQ =
== Modules ==
=== When loading a Nevow application using built-in Twisted server via 'twistd -noy file.tac', why do I get an import error when importing my module 'foo'? ===
Twisted does not recognize the current directory as loaded in Python path. On your file.tac, before any nevow or twisted modules are imported do this :
{{{
#!python
# file.tac
import os, sys
sys.path.append(os.getcwd()) # loads the current directory to Python path

# then start loading nevow and twisted modules
from twisted.application import service, internet

# start importing your modules here
from foo import BarPage
# etc...
-----------------------
# foo.BarPage.py

from nevow.rend import Page
class BarPage( Page ):
    def renderHTTP( self, ctx ):
        return 'foo'
}}}

== Request parameters ==
=== How do I extract request parameters ===
Request parameters come from the context object (but beware this: ).
You adapt the context object to an IRequest object. The parameters are stored in the args dictionary. 
{{{
#!python
request = inevow.IRequest(ctx)
if request.args.has_key('myparam'):
   validate(request.args['myparam'])
}}}

== Testing ==
=== How do I make fake context objects? ===
Divmod contains a testutil module that contains a set of ready made classes like !FakeRequest, !FakeSession etc. Use these. 
Example:

{{{
#!python
ctx = context.WebContext(tag=page)
ctx.remember(testutil.AccumulatingFakeRequest())
}}}