Question

我有这个模型，我想制作一个在auth_user DB中注册了用户名的购物清单，他可以创建一个list_name和一个sohppinList，即下面。我很有趣如何在它们之间建立联系。有人可以帮帮我吗？

class Item(models.Model):
    username = models.ManyToManyField(User)
    list_name = models.CharField(max_length=200)


class ShoppingList (models.Model):
    list_name = models.ManyToManyField(Item)
    item = models.CharField(max_length=200)
    quantity = models.IntegerField(default=0)
    checkbox = models.BooleanField(default=False)

Answer 1

我宁愿用这种方式设计模型：

class ShoppingList (models.Model):
    user = models.ForeignKey(User,related_name="user_shoplist")
    list_name = models.CharField(max_length=200)
    # your other fields...

class Item(models.Model):
    from_list = models.ForeignKey(ShoppingList, related_name="list_items") 
    item_name = models.CharField(max_length=200)
    # more fields..



#user actions
user = request.user
user_shoplist = user.user_shoplist.create(list_name="Dolls")

#adding items to shopping list
new_item1 = user_shoplist.list_items.create(item_name='barbie')
new_item2 = user_shoplist.list_items.create(item_name='teddy')
#.... etc etc


# all shopping lists of a user
user_shopping_lists = user.user_shoplist.all()

#all items in a shopping list of a user ("user_shoplist" from above)
all_items_in_a_shoppinglist = user_shoplist.list_items.all()

希望，这有助于

更新：你需要在保存过程中将shoplist对象添加到Item对象中。

def create(request): 
   if request.method == 'POST': 
    form = ItemForm(request.POST) 
    if form.is_valid(): 
      # the shoplist object
      form.save(commit=False)
      form.cleaned_date['from_list'] = your_shoplist_object
      form.save()
#...
#...

Answer 2

你正朝着正确的方向前进。但似乎有些事情有些混乱。如果我试图创建由用户拥有并包含项目的购物清单，我会这样做：

class ShoppingList (models.Model):
    user = models.ForeignKey(User, related_name='shopping_lists')
    name = models.TextField()

class Item(models.Model):
    name = models.TextField()
    list_name = models.ForeignKey(ShoppingList, related_name='items')

这可以让你在代码中使用这样的模型：

sl = ShoppingList(user=request.user, name='Christmas Shopping List')
sl.save()
for name in ('socks', 'coal', 'glow sticks'):
    sl.items.append(Item.objects.create(name=name))

然后你可以在这样的控制台中使用你的用户：

for s_list in user.shopping_lists.all():
    print s_list.items

不知道如何建立连接

2 个答案: