我的模型中有三個(gè)類別，每個(gè)類別都有價(jià)格。我想創(chuàng)建 Cart 對(duì)象。我如何使用 ManToManyField 在一個(gè) CartItem 中傳遞所有 3 個(gè)。models.pyclass Women(models.Model): photo = models.ImageField(upload_to='media') title = models.CharField(max_length=20) description = models.CharField(max_length=150) price = models.IntegerField() objects = models.manager def __str__(self): return self.title class Meta: verbose_name_plural = 'Women'class Men(models.Model): photo = models.ImageField(upload_to='media') title = models.CharField(max_length=20) price = models.IntegerField() description = models.CharField(max_length=150) objects = models.manager def __str__(self): return self.title class Meta: verbose_name_plural = 'Men'class Kids(models.Model): photo = models.ImageField(upload_to='media') title = models.CharField(max_length=20) price = models.IntegerField() description = models.CharField(max_length=150) objects = models.manager def __str__(self): return self.title class Meta: verbose_name_plural = 'Kids'我想創(chuàng)造類購(gòu)物車（模型。模型）：和類 CartItem（模型。模型）：
1 回答
莫回?zé)o
TA貢獻(xiàn)1865條經(jīng)驗(yàn) 獲得超7個(gè)贊
如果所有三個(gè)模型都具有相同的屬性，表示相同的對(duì)象，但它只改變了對(duì)象的“類別”，那么為什么不只創(chuàng)建一個(gè)具有您選擇類型的類別的模型呢？如果將來(lái)有必要，您將能夠擴(kuò)展到許多其他類別：
class Item(models.Model):
# add the choices:
WOMEN = "W"
MEN = 'M'
KIDS = "K"
SIGNED = "SI"
TYPE = (
(WOMEN, 'Women'),
(MEN, 'Men'),
(KIDS, 'Kids'),
)
photo = models.ImageField(upload_to='media')
title = models.CharField(max_length=20)
description = models.CharField(max_length=150)
price = models.IntegerField()
objects = models.manager
type = models.CharField(max_length=1, choices=TYPE, default=WOMEN, )
def __str__(self):
return self.title
使用此代碼，您將能夠?qū)λ许?xiàng)目進(jìn)行排序，type以獲取每個(gè)模型：
women_items = Item.objects.filter(type="W") # women items
men_items = Item.objects.filter(type="M") # women items
kids_items = Item.objects.filter(type="K") # women items
您還需要知道，當(dāng)您type在模板上打印屬性時(shí){{item.type}}，您將在列表中看到文本TYPE。
這將使您更容易獲得所需的東西，因此您只需要參考ItemM2M 關(guān)系上的模型。
我與購(gòu)物車關(guān)系不大，但這可能是您要找的：
class CartItem(models.Model):
item = models.ManyToManyField(Item)
amount = models.PositiveIntegerField(default=1)
class Cart(models.Model):
cart_item = models.ManyToManyField(CartItem)
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