________________________________
in app_name/context_processor
________________________________
from models import Charity
import datetime
from django.conf import settings

def charity_admin(request):
    charities = Charity.objects.all()
    return {"charities": charities,}
_____________________________
in charities/models.py
_____________________________
from django.db import models
from settings import DEFAULT_CHARITY_NAME as deafult_charity_name


class GetDefaultInstance(models.Manager):
    def get_default_instance(self):
        return super(Charity,self).get_query_set().filter(charity_name=default_charity_name)


class Charity(models.Model):
    class Meta:
        verbose_name_plural = 'Charities'
        app_label = 'charities'
    charity_name    = models.CharField(max_length=50)
    in_percentage   = models.IntegerField(help_text='default value is 0,\
                                          leave blank if you will enter fixed amount.', default=0, blank=True,null=True)
    fixed_amount    = models.IntegerField(help_text='default value is 0,\
                                          leave blank if you entered amount in percentage.',default=0, blank=True, null=True  )

    objects = models.Manager()
    default_instance = GetDefaultInstance()

    def __unicode__(self):
        return '%s'%self.charity_name

________________________________
in model_name/admin_views.py
_________________________________
from charities.models import Charity, GetDefaultInstance
from django.template import RequestContext
from django.shortcuts import render_to_response
from django.contrib.admin.views.decorators import staff_member_required
from generoucity.mini_shop.extensions.deals.models import ItemDetails
from generoucity.mini_shop.models import Item

class CharityReport(object):
    def __init__(self,request,itemdetails_id):
        self.request = request
        self.itemdetails_id = itemdetails_id

    def render_report(self):
        data = {}
        item = Item.objects.get(pk=self.itemdetails_id)
        itemdetail_obj  = ItemDetails.objects.get(item=item)
        charity_obj     = itemdetail_obj.charity
        if not type(charity_obj) is type('NoneType'):
            data['charity_name'] = charity_obj.charity_name
        else:
            data['charity_name'] = 'No charity is associated with this deal.'
        data['price'] = item.price
        if charity_obj.in_percentage:
            data['charity_category'] = 'Fixed Percentage: %s '%(charity_obj.in_percentage)
            data['charity_amount'] = (float(charity_obj.in_percentage)/100)*item.price
        else:
            data['charity_category'] = 'By Fixed Amount: %d'%(charity_obj.fixed_amount)
            data['charity_amount'] = charity_obj.fixed_amount
        data['item'] = item.name
        return render_to_response("admin/mini_shop/extensions/deals/charity_report.html",locals(),RequestContext(self.request,{}))

def report(request,itemdetails_id):
    charity_report_object = CharityReport(request, itemdetails_id)
    return charity_report_object.render_report()
report = staff_member_required(report)

______________________________________________
the template
______________________________________________

{% extends "admin/base_site.html" %}

{% block title %}List of books by publisher{% endblock %}

{% block content %}
<div id="content-main">
  <h1>Charity Associated with item "{{item.name}}"</h1>
  {% for key,value in data.iteritems %}
    <ul>
        <li><h3>{{key}}</h3></li>
        <li>{{value}}</li>
    </ul>

_________________________________________-
change_form.html
_____________________________

{% extends "admin/change_form.html" %}
{% load mini_shop_tags %}
{% load i18n %}
{% block object-tools %}
{% if change %}{% if not is_popup %}
  <ul class="object-tools">
    <li><a href="history/" class="historylink">{% trans "History" %}</a></li>
    {% if opts.module_name == "item" %}
        <li><a href="/admin/charity_report/{{object_id}}" class="historylink">Charity Report</a></li>
    {% endif %}
    {% if has_absolute_url %}
        <li><a href="../../../r/{{ content_type_id }}/{{ object_id }}/" class="viewsitelink">
            {% trans "View on site" %}</a>
        </li>
    {% endif%}
  </ul>
{% endif %}{% endif %}
{% endblock %}
    {% endfor %}

</div>
<div class="submit-row">
<p class="default"><a  href="/admin/mini_shop/item/{{item.pk}}/">Back</a></p>
</div>
{% endblock %}