from django.contrib import adminfrom .models import Order,OrderItemfrom django.http import HttpResponseimport datetime# Register your models here.import csvdef export_to_csv(modeladmin, request, queryset):    opts=modeladmin.model._meta    response=HttpResponse(content_type='text/csv')    response['Content-Disposition']='attachment;filename={}.csv'.format(opts.verbose_name)    writer=csv.writer(response)    fields = [field for field in opts.get_fields() if not field.many_to_many and not field.one_to_many]    writer.writerow([field.verbose_name.encode('utf-8') for field in fields])    for obj in queryset:        data_row=[]        for field in fields:            value=getattr(obj,field.name)            if isinstance(value,datetime.datetime):                value=value.strftime('%d/%m/%Y')            data_row.append(value)        writer.writerow(data_row)    return responseexport_to_csv.short_description = '导出ESV'class OrderItemInline(admin.TabularInline):    model = OrderItem    raw_id_fields = ['product']class OrderAdmin(admin.ModelAdmin):    list_display = ['id', 'name', 'email',                    'address', 'postal_code', 'city', 'paid',                    'created', 'updated']    list_filter = ['paid', 'created', 'updated']    inlines = [OrderItemInline]    actions = [export_to_csv]admin.site.register(Order, OrderAdmin)