模型
代码语言：javascript复制# admin.py
class CustomerAdmin(admin.ModelAdmin):
list_display = ('foo', 'number_of_orders')
# models.py
class Order(models.Model):
bar = models.CharField[...]
customer = models.ForeignKey(Customer)
class Customer(models.Model):
foo = models.CharField[...]
def number_of_orders(self):
return u'%s' % Order.objects.filter(customer=self).count() 在 admin 内实现
代码语言：javascript复制# admin.py
from django.db import models
class CustomerAdmin(admin.ModelAdmin):
list_display = ('number_of_orders',)
def get_queryset(self, request):
# def queryset(self, request): # For Django <1.6
qs = super(CustomerAdmin, self).get_queryset(request)
# qs = super(CustomerAdmin, self).queryset(request) # For Django <1.6
qs = qs.annotate(models.Count('order'))
return qs
def number_of_orders(self, obj):
return obj.order__count
number_of_orders.admin_order_field = 'order__count'在 model 内实现
代码语言：javascript复制from django.db import models
class CustomerManager(models.Manager):
def get_query_set(self):
return super(CustomerManager, self).get_query_set().annotate(models.Count('order'))
class Customer(models.Model):
foo = models.CharField[...]
objects = CustomerManager()
def number_of_orders(self):
return u'%s' % Order.objects.filter(customer=self).count()
number_of_orders.admin_order_field = 'order__count'
