Django: How to get field value dynamically using custom template tags?

I recently got a problem where I need to get field's value
automatically using templatetags.The idea follows which mentioned in
the book "Practical Django Project 2nd Edition", but the book version
is getting a list of objects where I want to get only a object's
value. I want to get the site settings (Title, Tagline etc.) and pass
in the template dynamically so that I don't have to write the code
again to get each field's value.

Here is what I have done so far.

*Define an admin.py for the model (not included here because it's not
important)*

*Defined a model:*

from django.db import models
from django.contrib.sites.models import Site

class Naming(models.Model):
title = models.CharField(max_length=250)
site_id = models.ForeignKey(Site)
tagline = models.CharField(max_length=250)
description = models.TextField(blank=True)

def __unicode__(self):
return self.title

*Defined a template tag file, the commented line is where I get stuck*

from django.db.models import get_model
from django.contrib.sites.models import Site
from django import template

def do_site_att(parser, token):
bits = token.split_contents()
if len(bits) != 5:
raise template.TemplateSyntaxError("'get_site_att' tag takes
exactly four arguments")
model_args = bits[1].split('.')
if len(model_args) != 2:
raise template.TemplateSyntaxError("First argument to
'get_site_att' must be an 'application name'.'model name' string.")
model = get_model(*model_args)
if model is None:
raise template.TemplateSyntaxError("'get_site_att' tag got an
invalid model: %s." % bits[1])
return ContentNode(model, bits[2], bits[4])

class ContentNode(template.Node):
def __init__(self, model, field, varname):
self.model = model
self.field = field
self.varname = varname

def render(self, context):
current_site = Site.objects.get_current()
try:
var = self.model.objects.get(site_id=current_site.id)
context[self.varname] = var.title #I get stuck here
because it not accepts input like var.field (I have extract the field
value above)
except:
context[self.varname] = "Value not found"
return ''

register = template.Library()
register.tag('get_site_att', do_site_att)

*The template query in base.html:*

{% load general_tags %}
{% get_site_att general.Naming title as title %}
<h1 id="branding">{{title}}</h1>
{% get_site_att general.Naming tagline as tagline %}
<h2 id="tagline">{{tagline}}</h2>

I have tried all the possible ways I can think of, but just can't get
it works. Any help is really appreciated. Thanks.

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