Re: Weird problem with rendering a Variable in a custom tag

And you are absolutely correct, using a local variable in the render
method and not rebinding self,ip resolves the problem. Thank you very
much. Can you explain why this is?

On May 23, 5:34 am, bruno desthuilliers
<bruno.desthuilli...@gmail.com> wrote:
> On May 23, 5:37 am, stevedegrace <degr...@gmail.com> wrote:
>
> > I developed a custom tag to look up the country of a certain IP
> > address using an IP to country database. It's sort of rough and ready,
> > but it should work. The idea is that you read the comment.ip_address,
> > feed it to the {% country %} tag, which then spits out the two letter
> > country code. The interesting thing is that the tag works once and
> > only once per page load if it has to render a variable. All subsequent
> > calls raise template.VariableDoesNotExist in the code below.
>
> > The interesting thing is that if you strip out the ability to
> > recognize an IP as a string and make it just render variables, and you
> > bind self.ip as a Variable object in the __init__ method and then try
> > to call its render method in the CountryNode's render method, it
> > actually raises AttributeError and claims that Variable object has no
> > attribute render. Weird! FYI, I'm using Django 1.2. Anyone have any
> > thoughts about what the heck is going on?
>
> Avoid rebinding self.ip in the render method and it should work just
> fine.
>
>
>
> > Here's the Python code:
> (snip imports)
> > class CountryNode(template.Node):
> >     def __init__(self, ip):
> >         self.ip = ip
>
> >     def render(self, context):
> >         if self.ip[0] in '\'"':
> >             self.ip = self.ip.strip('\'"')
>
> don't rebind self.ip here.
>
> >         else:
> >             try:
> >                 self.ip = Variable(self.ip).resolve(context)
>
> don't rebind it here neither
>
> You want to work on local variable, definitly.
>
> HTH

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