关于python：AttributeError – 类型对象’Services’没有属性’service_price’

AttributeError - type object 'Services' has no attribute 'service_price'

我正在尝试创建类似于发票程序的程序，以创建发票并计算价格。

我仍然在模型部分，我试图计算所有服务包括在一张发票中，并在invoices.subtotal中更新它们。

我的问题是无法将services.service_price的汇总值传递到invoices.subtotal。

当我单击[保存并继续编辑]时，我看到：

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AttributeError at /admin/invoices/invoices/1/

type object 'Services' has no attribute 'service_price'

Request Method: POST
Request URL: http://192.168.1.3/invmaster/admin/invoices/invoices/1/
Django Version: 1.2.1
Exception Type: AttributeError
Exception Value:

type object 'Services' has no attribute 'service_price'

Exception Location: /opt/invmaster/invoices/models.py in save, line 24
Python Executable: /usr/bin/python
Python Version: 2.6.5

下面是一些代码：

发票/模型.py

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1 from django.db import models
2
3 from invmaster.general.models import Client
4 from invmaster.general.models import job_name
5 from invmaster.general.models import my_data
6
7 from decimal import *
8 import math
9
10 ### Invoices table
11 class Invoices (models.Model):
12 invoice_id = models.AutoField(primary_key=True)
13 client_name = models.ForeignKey(Client)
14 date_created = models.DateField()
15 subtotal = models.DecimalField('Precio sin IVA:(euros)',max_digits=6, decimal_places=2)
16 total = models.DecimalField('Precio Final:(euros)',max_digits=6, decimal_places=2, blank=True, null=True)
17 paid = models.BooleanField()
18 class Meta:
19 db_table = u'invInvoices'
20
21 def save(self, *args, **kwargs):
22 #self.subtotal = int(Services.service_price)
23 f = my_data()
24 self.subtotal = Services.service_price
25 self.total = self.subtotal * ((Decimal(f.IVA)/100)+1)
26 super(Invoices, self).save(*args, **kwargs)
27
28
29
30 ### Services table
31 class Services (models.Model):
32 JOB_CUANTITY = ( (u'H',u'Horas'),
33 (u'U',u'Unidades'),
34 )
35 invoice_id = models.ForeignKey(Invoices)
36 service_type = models.CharField('Tipo',max_length=1, choices=JOB_CUANTITY)
37 service_cuantity = models.IntegerField('Cantidad/Horas', max_length=2)
38 service_name = models.ForeignKey(job_name)
39 service_unit_price = models.DecimalField('Precio por unidad (euros):',max_digits=6, decimal_places=2,blank=True, null=True)
40 service_price = models.DecimalField('Precio (euros):',max_digits=6, decimal_places=2, blank=True, null=True)
41
42 class Meta:
43 db_table = u'invServices'
44 def __unicode__(self):
45 return u'%s' % (self.service_name)
46 def save(self, *args, **kwargs):
47 self.service_price = self.service_cuantity * self.service_unit_price
48 super(Services, self).save(*args, **kwargs)

其他文件：常规/型号.py

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### General table
8 class my_data (models.Model):
...
16 IVA = models.IntegerField(max_length=2, default='18') ### IVA = VAT # 18 = 18%
...
26 ### Clients table
27 class Client (models.Model):
28 client_id = models.AutoField(primary_key=True)
29 client_name = models.CharField(max_length=45, unique=True)
...
### Jobs
58 class job_name (models.Model):
59 job_type_id = models.AutoField(primary_key=True)
60 job_name = models.CharField('Servicio/Producto',max_length=60, unique=True)
61 job_price = models.DecimalField('Precio sin IVA (euros:)', max_digits=6, decimal_places=2)
62
63 class Meta:
64 db_table = u'genJobNames'
65
66 def __unicode__(self):
67 return u'%s (%s)' % (self.job_name, self.job_price)

抱歉，我的英语和这个问题，如果它是愚蠢的(我不是程序员，我是系统管理员，我是python/django中的新手：-)

提前谢谢

干杯

更新：

文件夹：linadmin.homeunix.net/models.txt文件linadmin.homeunix.net/admin.txt

您没有任何汇总值。在这个上下文中，Services.service_price没有任何意义——它是在类级别上对模型字段本身的引用，而不是对它的任何特定实例的值的引用。

您需要一些代码来计算实际值。请记住，您有一个从服务到发票的foreignkey，这意味着每个发票可以有许多服务。所以大概你想要的是与这张发票相关的所有服务的总价值。您可以使用聚合来解决这个问题：

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from django.db.models import Sum
service_sum = self.services_set.aggregate(Sum('service_price'))
self.subtotal = service_sum['service_price__sum']

它针对数据库查询所有相关服务。