Simple admin example

admin.py

# -*- coding: utf-8 -*-

import xlwt

from django.contrib import admin
from django.http import HttpResponse

from models import (PaymentForm, Order, OrderItem, 
    Discount, Affiliate)
from forms import DiscountForm

def report(modeladmin, request, queryset):
    resp = HttpResponse(mimetype='application/vnd.ms-excel')
    resp['Content-Disposition'] = u'attachment; filename=Vendas.xls'
    workbook = xlwt.Workbook()
    worksheet = workbook.add_sheet('Vendas')
    worksheet.write(0, 0, u'Id')
    worksheet.write(0, 1, u'Usuário')
    worksheet.write(0, 2, u'Forma de Pagamento')
    worksheet.write(0, 3, u'Status')
    worksheet.write(0, 4, u'Data')
    worksheet.write(0, 5, u'Produtos')
    worksheet.write(0, 6, u'Desconto')
    worksheet.write(0, 7, u'Valor Total')
    x = 1
    for order in queryset:
        worksheet.write(x, 0, order.id)
        worksheet.write(x, 1, unicode(order.user))
        worksheet.write(x, 2, unicode(order.payment))
        worksheet.write(x, 3, order.status_description)
        worksheet.write(x, 4, order.created_on, 
                        style=xlwt.easyxf(num_format_str='dd/mm/yyyy hh:mm:ss'))
        worksheet.write(x, 5, u', '.join(order.products()))
        worksheet.write(x, 6, order.discount, style=xlwt.easyxf("", "#,###.00"))
        worksheet.write(x, 7, order.total, style=xlwt.easyxf("", "#,###.00"))
        x = x + 1
    workbook.save(resp)
    return resp
report.short_description = u'Relatório de Vendas'

class OrderAdmin(admin.ModelAdmin):

    list_display = ['id', 'user', 'payment', 'status', 'created_on']
    list_filter = ['status', 'created_on']
    actions = [report]

admin.site.register(Order, OrderAdmin)

class DiscountAdmin(admin.ModelAdmin):

    list_display = ['code', 'value_description', 
                    'order', 'created_on']
    form = DiscountForm

admin.site.register(Discount, DiscountAdmin)

class AffiliateAdmin(admin.ModelAdmin):

    list_display = ['name', 'code', 'created_on']

admin.site.register(Affiliate, AffiliateAdmin)    

admin.site.register([PaymentForm, OrderItem])