从 django 中的子 model 访问父的 model 属性

Question

please can anyone help me out am stuck i want to access items in the item model which i have referenced in the OrderItem model but am trying to access the item from Order model here are the models here is the model that am using to access

class Order(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE)
    ref_code = models.CharField(max_length=20)
    items = models.ManyToManyField(OrderItem)
    start_date = models.DateTimeField(auto_now_add=True)
    order_date = models.DateTimeField()
    ordered = models.BooleanField(default=False)
    shipping_address = models.ForeignKey('Address',on_delete=models.SET_NULL,related_name='shipping_address',blank=True,null=True)
    payment = models.ForeignKey('Payment',on_delete=models.SET_NULL,blank=True,null=True)
    being_delivered = models.BooleanField(default=False)
    received = models.BooleanField(default=False)
    refund_requested = models.BooleanField(default=False)
    refund_granted = models.BooleanField(default=False)

这是我要访问的父 model

class OrderItem(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE)
    ordered_order = models.BooleanField(default=False)
    item = models.ForeignKey(Item, on_delete=models.CASCADE)
    quantity = models.IntegerField(default=1)

并且我试图访问的项目必须在这个 model

class Item(models.Model):
    title = models.CharField(max_length=100)
    price = models.IntegerField()
    discount_price = models.IntegerField(blank=True, null=True)
    category = models.ForeignKey(Categories, on_delete=models.DO_NOTHING)
    tags = models.ManyToManyField(Tags, related_name='itemTags')
    slug = models.SlugField(max_length=200, unique=True)
    size = models.CharField(blank=True, null=True, max_length=5)
    model = models.CharField(max_length=100, blank=True, null=True)
    description = models.TextField()
    quantity = models.IntegerField(default=1)
    image = models.ImageField()
    color = models.CharField(max_length=100, blank=True, null=True)
    brand = models.CharField(max_length=100, blank=True, null=True)
    Display = models.DecimalField(max_digits=100,
                                  decimal_places=1,
                                  blank=True,
                                  null=True)
    ram = models.CharField(max_length=100, blank=True, null=True)
    material = models.CharField(max_length=100, blank=True, null=True)
    hdd = models.CharField(max_length=100, blank=True, null=True)
    size = models.CharField(max_length=100, blank=True, null=True)
    lens = models.CharField(max_length=100, blank=True, null=True)
    created_at = models.DateField(auto_now_add=True)

我正在尝试这个，但似乎不起作用

recent_orders=Order.objects.filter(user=2)
 for item in recent_orders:
     print(item.items.item.title)

任何人都可以帮帮我好吗！！！

Answer 1

你需要这个代码：

recent_orders=Order.objects.filter(user=2)
for order in recent_orders:
    for order_item in order.items:
        print(order_item.item.title)

尝试为所有变量赋予不同的名称，这将使编程更有效