总结多个类 Def 函数以获取 Django 模型中的总量

Question

我已经完成了与我的问题相关的问题，但没有一个指向我的想法。我有不同的类模型，带有 def 函数。我可以实现每个模型的总量，但我想要实现的是，在得到每个模型的总量之后，我如何将模型加在一起，得到我所有模型的总量。以下是我的代码

class HomeOrderItem(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    home_ordered = models.BooleanField(default=False)
    item = models.ForeignKey(HomeItem, on_delete=models.CASCADE)
    quantity = models.IntegerField(default=1)

    def get_total_item_price(self):
        return self.quantity * self.item.home_price
        
    def get_total_discount_price(self):
        return self.quantity * self.item.home_discount_price

    
    def get_final_price(self):
        if self.item.home_discount_price:
            return self.get_total_discount_price()
        return self.get_total_item_price()


class HomeOrder(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    home_items = models.ManyToManyField(HomeOrderItem)
    date_created = models.DateTimeField(auto_now_add=True)
    ordered_created = models.DateTimeField()
    home_ordered = models.BooleanField(default=False)

    def __str__(self):
        return self.user.username

    def get_total_everything(self):
        total = 0
        for order_item in self.home_items.all():
            total += order_item.get_final_price()
        return total

class MenOrderItem(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    men_ordered = models.BooleanField(default=False)
    item = models.ForeignKey(MenItem, on_delete=models.CASCADE)
    quantity = models.IntegerField(default=1)

    def get_total_item_price(self):
        return self.quantity * self.item.men_price
        
    def get_total_discount_price(self):
        return self.quantity * self.item.men_discount_price

    
    def get_final_price(self):
        if self.item.men_discount_price:
            return self.get_total_discount_price()
        return self.get_total_item_price()


class MenOrder(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    men_items = models.ManyToManyField(MenOrderItem)
    date_created = models.DateTimeField(auto_now_add=True)
    ordered_created = models.DateTimeField()
    men_ordered = models.BooleanField(default=False)
    
    def __str__(self):
        return self.user.username

    def get_total_men_everything(self):
        total = 0
        for order_item in self.men_items.all():
            total += order_item.get_final_price()
        return total

我希望能够将def get_total_everything() + def get_total_men_everything () 相加得到我的最终金额

Answer 1

您可以在这些函数上方使用@staticmethod 装饰器，在视图上导入模型，然后您可以这样调用它： sum = HomeOrderItem.get_total_item_price() + HomeOrderItem.get_total_discount_price() + ...etc，你可以列出你想要的所有功能。