我的 models.py 看起來像這樣：class Order(models.Model): items = models.ManyToManyField(OrderItem)class OrderItem(models.Model): (item in the cart) item = models.ForeignKey(Item, on_delete=models.CASCADE)class Item(models.Model): title = models.CharField(max_length=100) price = models.FloatField() discount_price = models.FloatField(blank=True, null=True) label = models.ManyToManyField(Label, blank=True) slug = models.SlugField(unique=True) description = models.TextField()class Bike(models.Model): item = models.OneToOneField(Item, on_delete=models.CASCADE) brand = models.ManyToManyField(Brand) size = models.ManyToManyField(Size, blank=True)class Accessory(models.Model): item = models.OneToOneField(Item, on_delete=models.CASCADE) brand_accessory = models.ManyToManyField(BrandAccessory)所以目前item我OrderItem模型中的字段顯示模型中項目的標(biāo)題和數(shù)量Item：def __str__(self): return f"{self.quantity} of {self.item.title}"ItemOneToOneField與Bike和連接Accessory。是否可以顯示品牌和尺寸，Bike如果它被添加到OrderItem，brand_accessory如果Accessory被添加到OrderItem？它看起來像 {quantity} {item.title}（如果是自行車）> {bike.brand} {bike.size}（如果附件）> {accessory.brand_accessory}
1 回答
臨摹微笑
TA貢獻(xiàn)1982條經(jīng)驗 獲得超2個贊
您可以使用hasattr檢查您item是否需要 OneToOneField
class OrderItem(models.Model):
...
def __str__(self):
if hasattr(self.item, 'bike'):
#get value you need like: self.item.bike.brand
if hasattr(self.item, 'accessory'):
#get value you need like: self.item.accessory.brand_accessory
return #get values you need together
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