Question

我有一个过滤器，我希望选择一个供应商，然后为该供应商展示我们拥有的电路类型以及这些电路类型的总成本，从我的研究中可以看出以下内容

查询：

model_provider_costs = CircuitInfoData.objects.filter(provider = "BT").values('circuit_type').annotate(total=Sum('cost_per_month'))

它应该给我：

{'circuit_type': u'DSL', 'toal': Decimal('9,457.00')},
{'circuit_type': u'MPLS', 'toal': Decimal('20,000.00')},

但它目前只是给我每个电路，例如：

[
    {'circuit_type': u'DSL', 'total': Decimal('57.00')},
    {'circuit_type': u'MPLS', 'total': Decimal('550.78')},
    {'circuit_type': u'MPLS', 'total': Decimal('547.87')},
    {'circuit_type': u'DSL', 'total': Decimal('57.00')},
    {'circuit_type': u'MPLS', 'total': Decimal('550.78')},
    {'circuit_type': u'DSL', 'total': Decimal('57.00')},
    {'circuit_type': u'MPLS', 'total': Decimal('547.87')},
    ... and so on

这是我的模特：

class CircuitInfoData(models.Model):    
    showroom_config_data = models.ForeignKey(ShowroomConfigData,verbose_name="Install Showroom")
    major_site_info = models.ForeignKey(MajorSiteInfoData,verbose_name="Install Site") 
    circuit_type = models.CharField(max_length=100,choices=settings.CIRCUIT_CHOICES)    
    circuit_speed = models.IntegerField(blank=True)
    circuit_bearer = models.IntegerField(blank=True)
    provider = models.CharField(max_length=200,choices=settings.PROVIDER_CHOICES)
    ref_no = models.CharField(max_length=200,verbose_name="Reference No")
    dsl_username = models.CharField(max_length=200,verbose_name="DSL Username",blank=True)
    dsl_password = models.CharField(max_length=200,verbose_name="DSL Password",blank=True)
    dsl_tel_no = models.CharField(max_length=200,verbose_name="DSL Tel No",blank=True)  
    install_location = models.CharField(max_length=200)
    install_date = models.DateField()
    cost_per_month = models.DecimalField(decimal_places=2,max_digits=8)
    contract_length = models.IntegerField(verbose_name="Contact length in years")
    notes = models.TextField(blank=True)
    service_service_contacts = models.ForeignKey(ServiceContacts)
    subnet = models.GenericIPAddressField(protocol='IPv4',verbose_name="Subnet",blank=True,null=True)
    default_gateway = models.GenericIPAddressField(protocol='IPv4',verbose_name="Default Gateway",blank=True,null=True)
    subnet_mask = models.CharField(max_length=4,verbose_name="Subnet Mask",choices=settings.SUBNET_MASK_CHOICES,blank=True)

    class Meta:
        verbose_name = "Circuit Data"
        verbose_name_plural = "Circuit Data"
        ordering = ('showroom_config_data__location','circuit_speed')

    def __unicode__(self):
        return '%s | %s | %s | %s | %s' % (self.showroom_config_data.location,self.major_site_info.location, self.provider, self.circuit_type, self.ref_no)

Answer 1

应该是

model_provider_costs = CircuitInfoData.objects.filter(provider = "BT").prefetch_related('circuit_type').aggregate(Sum('cost_per_month'))

Django模型，过滤然后组和总成本

1 个答案: