Question

我有3个型号。我在date和customerproductbill上使用billmanagment 表保存产品销售记录，销售多少产品。我正在使用ORM django查询并获取记录正确，但我还需要那些不销售的产品，在我的客户产品中只保存销售产品记录。我需要销售而不是销售产品，因为我正在开发显示所有记录的库存分类帐。这是我的疑惑：

products = Product.objects.all().order_by('id')
    ---------------------------------------------------
product_sale_history = BillManagement.objects.filter(Q(creation_date__gte=from_date) &
                                                                             Q(creation_date__lte=to_date) & Q(product__in=products) ).exclude(
                            Q(customer_id=1248)).values('customerproductbill__product_id')\
                            .annotate(sale_quantity = Coalesce(Sum('customerproductbill__product_qty'), 0)).order_by('customerproductbill__product_id')



class Product(models.Model):
    """ Represent an Inventory Product entity  """

    product_name = models.CharField(max_length=512, null=True, blank=True)
     reference_number =  models.CharField(max_length=20, null=True, blank= True, unique=True)

class Meta:

    verbose_name_plural = 'Inventory Products'

    def __unicode__(self):
           return self.product_name
            -------------------------------------------------------

class BillManagement(models.Model):
    """ Represent a Bill entity"""
    bill_number = models.CharField(max_length=250, null=True, blank=True)
    creation_date = models.DateField(auto_now_add=True)

    product = models.ManyToManyField(Product,through='CustomerProductBill',
                                                     related_name='customer_product_bill')
class Meta:
    verbose_name_plural = 'BillManagements'
    ordering = ['creation_date']

    def __unicode__(self):
        return self.creation_date
        ------------------------------------------------
class CustomerProductBill(models.Model):
    """ Represent a CustomerProductBill entity """
    bill = models.ForeignKey(BillManagement, null=True, blank=True)
    product = models.ForeignKey(Product, null=True, blank=True)
    product_qty = models.IntegerField(null=False, blank=False, default=0)
class Meta:
    verbose_name_plural = 'CustomerProductBill'
    ordering = ['product']

    def __unicode__(self):
        return self.product.product_name

有人可以修改我的查询。如何使用django表格查询在表格中获得销售而非销售产品

如何在django中应用复杂的ORM查询

0 个答案: