在Django中使用DetailView和Formset链接到其他外部模型

Question

我是django-formset的新手。我一直试图找到一种方法将formset（Model_CustomerCart和Model_CustomerCartItem）的模型与名为Model_ItemPrice的其他模型链接起来。

使用DetailView，html页面可以显示项目列表以及相应的价格。

有没有人知道如何实现这一目标？

我的代码如下。

models.py

class Model_ItemIndex(models.Model):
    item_name = models.CharField(max_length = 50, null = True, blank = False)

class Model_ItemPrice(models.Model):
    item_name = models.ForeignKey(Model_ItemIndex, null = True, blank = False)
    item_price = models.FloatField(null = True, blank = False)

class Model_CustomerCart(models.Model):
    customer_name = models.CharField(max_length = 50, null = True, blank = False)

class Model_CustomerCartItem(models.Model):
    customer_name = models.ForeignKey(Model_CustomerCart)
    item_name = models.ForeignKey(Model_ItemIndex)

forms.py

class Form_ItemIndex(forms.ModelForm):

    class Meta:
        model = Model_ItemIndex

        fields = [
            "item_name",
        ]

class Form_ItemName(forms.ModelForm):

    class Meta:
        model = Model_ItemName

        fields = [
            "item_name",
            "item_price",
        ]

class Form_CustomerCart(forms.ModelForm):

    class Meta:
        model = Model_CustomerCart

        fields = [
            "customer_name",
        ]

class Form_CustomerCartItem(forms.ModelForm):

    class Meta:
        model = Model_CustomerCartItem

        fields = [
            "customer_name",
            "item_name",
        ]

Formset_customercartitem = forms.inlineformset_factory(
    Model_CustomerCart,
    Model_CustomerCartItem,
    form = Form_CustomerCartItem,
    extra = 3
    )

views.py

class View_CustomerCart_DV(DetailView):
    queryset = Model_CustomerCart.objects.all()

的HTML

{% for cartitem_ in object.model_customercartitem_set.all %}
    {{ cartitem_.item_name }} 
    {{ cartitem_.item_name.item_price }}  <------ How can I get the item_price from Model_ItemPrice?
{% endfor %}

由于

Answer 1

您已经通过Model_ItemIndex导航到cartitem_.item_name，因此您应该可以通过Model_ItemPrice导航到model_itempriceset并检索第一条记录。

例如：

{% for cartitem_ in object.model_customercartitem_set.all %}
    {{ cartitem_.item_name }} 
    {{ cartitem_.item_name.model_itemprice_set.first.item_price}}
{% endfor %}

虽然一件物品只有一个价格，但我们会假设。