Django - 动态过滤多个查询集

Question

我想按费用类型对费用进行每月明细。 我想通过过滤器表单动态输入开始日期和结束日期，这样我就不必为每个月重复代码。

对于每种类型的费用，我创建了一个单独的查询集（超过 20 个）。

这是视图.py

def monthly_analysis_november(request):

    accountant = Expenses.objects\
    .filter(date__gte = "2023-11-01", date__lte = "2023-11-30", type_of_expense = "accountant expenses")\
    .annotate(price=Sum(F('quantity')*F('price_per_unit')))\
        .aggregate(total_accountant=Sum('price'))
        
    interest_rates = Expenses.objects\
    .filter(date__gte = "2023-11-01", date__lte = "2023-11-30", type_of_expense = "interest rates")\
    .annotate(price=Sum(F('quantity')*F('price_per_unit')))\
        .aggregate(total_interest_rates=Sum('price'))
        
    phones = Expenses.objects\
    .filter(date__gte = "2023-11-01", date__lte = "2023-11-30", type_of_expense = "phones")\
    .annotate(price=Sum(F('quantity')*F('price_per_unit')))\
        .aggregate(total_phones=Sum('price'))
        
    oil = Expenses.objects\
    .filter(date__gte = "2023-11-01", date__lte = "2023-11-30", type_of_expense = "oil")\
    .annotate(price=Sum(F('quantity')*F('price_per_unit')))\
        .aggregate(total_oil=Sum('price'))
        
    leasing = Expenses.objects\
    .filter(date__gte = "2023-11-01", date__lte = "2023-11-30", type_of_expense = "leasing")\
    .annotate(price=Sum(F('quantity')*F('price_per_unit')))\
        .aggregate(total_leasing=Sum('price'))
        
    other_expenses = Expenses.objects\
    .filter(date__gte = "2023-11-01", date__lte = "2023-11-30", type_of_expense = "other")\
    .annotate(price=Sum(F('quantity')*F('price_per_unit')))\
        .aggregate(total_other_expenses=Sum('price'))
    ...

这是我创建的 model.py

class Expenses(models.Model):
  date = models.DateField()
  place_of_expense = models.ForeignKey(ConstructionSite, on_delete=models.CASCADE, blank=True, null=True)
  TYPE_OF_EXPENSE_CHOICES = (
    ("oil", "oil"),
    ("leasing", "leasing"),
    ("material", "material"),
    ("land leasing", "land leasing"),
    ("spare parts", "spare parts"),
    ("tools and equipment", "tools and equipment"),
    ("services", "services"),
    ("accountant expenses", "accountant expenses"),
    ("interest rates", "interest rates"),
    ("phones", "phones"),
    ("other", "other"),
    ...
  )
  type_of_expense = models.CharField(blank=True, null=True, max_length=25, choices=IZBOR_VRSTE_TROSKA, default = "Gorivo")
  expense_description = models.CharField(max_length=255)
  unit = models.CharField(blank=True, null=True, max_length=20, choices=IZBOR_JEDINICE_MERE, default = "l")
  quantity = models.DecimalField(max_digits=10, decimal_places=2)
  price_per_unit = models.DecimalField(max_digits=10, decimal_places=2)
  supplier = models.ForeignKey(Supplier, on_delete=models.CASCADE, blank=True, null=True)

我在应用程序的其他部分使用了 django-filters，但在这里我无法实现它。 目前，我每个月都有相同的视图函数，但这是大量重复的代码。唯一的区别是 date__gte 和 date__lte。 是否有可能使用 django-filters 或其他方式来做到这一点？

Answer 1

查看 Djanog-filter 文档 我认为您需要做的就是创建一个过滤器类，如下所示：

date__gte