Django custom form field displays value incorrectly

I am trying to create a custom model field and widget to display google maps api v3 and click - select point and save that.

The value in the database must be in this format: LAT, LONG, FORMATTED_ADDRESS_BY_GOOGLE_REVERSE_GEOCODER

Here's my .py fields:

from django.db import models

class LatLong(object):

    def __init__(self, *args, **kwargs):
        self.lat = kwargs.get('lat',0)
        self.long = kwargs.get('long',0)
        self.addr = kwargs.get('addr','')

class CoordField(models.Field):

    description = 'Coordinates field'
    __metaclass__ = models.SubfieldBase

    def __unicode__(self):
        return 'LatLong obj'

    def __init__(self, *args, **kwargs):
        kwargs['max_length'] = 255 
        super(CoordField, self).__init__(*args, **kwargs)

    def db_type(self, connection):
        return 'varchar(%s)' % self.max_length

    def get_prep_value(self, value):
        return '%s,%s,%s' % (value.lat, value.long, value.addr)

    def to_python(self, value):
        if isinstance(value, LatLong):
            return value

        try:
            x = value.split(',')
        except:
            return LatLong(lat=0,long=0,addr='')

        return LatLong(lat=x[0], long=x[1], addr=','.join(x[2:]))

      

        
        
        
      

    

And my widgets.py:

from django.forms import Widget, TextInput

from django.template.loader import render_to_string

from django.utils.safestring import mark_safe

from settings import GMAPS_API_KEY


class LatLongWidget(TextInput):

    class Media:
        css = { 
            'all':('testing.css',)
        }   
        js = ( 
            'resource/js/coord.js',
        )   

    def __init__(self, attrs=None):
        default_attrs = {}

        if attrs:
            default_attrs.update(attrs)

        super(LatLongWidget, self).__init__(default_attrs)

    def render(self, *args, **kwargs):
        output = super(LatLongWidget, self).render(*args, **kwargs)

        output += render_to_string('maps/coord.html',
                                    {'GMAPS_API_KEY':GMAPS_API_KEY,
                                     'latlong': args[1]})

        return mark_safe(output)

      

        
        
        
      

    

As I understand it, defining to_python () from a field should always return a python object, while get_prep_value () should do the exact opposite.

As you can see from the screenshot below, the result of the field in the form is not 3 comma separated values, but a string representation of the LatLong object returned by to_python ().

This happens automatically in my widget when I call output = super(LatLongWidget, self).render(*args, **kwargs)

Screenshot:

What am I missing here? Should I perform more functions? Did I do it completely wrong?

Any help would be greatly appreciated. Thank.