如何访问Django模板中的外键?(详细视图) [英] How to access foreign key in a django template? (DetailView)

问题描述

我想在Campaign DetailView模板中显示产品.

I want to display products in a Campaign DetailView template.

在我的项目中，每个广告系列都有一个包含产品的商店，因此流程就像

In my project each campaign has a shop which contains products, so the flow is like,

广告活动->商店->产品

Campaign --> Shop --> Products

广告系列模型.py

class Campaign(models.Model):
     team = models.OneToOneField(Team, related_name='campaigns', on_delete=models.CASCADE, null=True, blank=True)
     shop = models.OneToOneField(shop_models.Shop, on_delete=models.CASCADE, null=True, blank=True)

商店模型.py

class Product(models.Model):
     title =         models.CharField(max_length=100)
     description =   models.CharField(max_length=700, null=True, blank=True)
     price  =        models.DecimalField(max_digits=10, decimal_places=0)

class Shop(models.Model):
     product  =  models.OneToOneField(Product, related_name='shop_product', on_delete=models.CASCADE, null=True, blank=True)
     product2 =  models.OneToOneField(Product, related_name='shop_product2', on_delete=models.CASCADE, null=True, blank=True)
     product3 =  models.OneToOneField(Product, related_name='shop_product3', on_delete=models.CASCADE, null=True, blank=True)

DetailView

class CampaignDetail(DetailView):
    model = Campaign
    form_class = CampaignForm
    pk_url_kwarg = 'pk'
    context_object_name = 'object'
    template_name = 'campaign_detail.html'

模板

{% for item in obj.shop_set.all %}
        <div class="plan">
            <a href="">

                <h4>{{ item.title }}</h4>
                <h5>{{ item.price }}</h5>
                <img src="{{ item.image.url }}" alt="">

            </a>
        </div>

该模板中的字段原来为空.任何帮助将不胜感激.

Fields turned out to be empty in the template. Any help would be appreciated.

推荐答案

它们与 OneToOneField ，那么您可以通过广告系列详细信息视图访问shop的值，如下所示:

As they are related by OneToOneField, then you can access the values of shop from campaign details view like this:

{{ obj.shop }}

如果您要访问产品，请按照以下步骤操作:

And if you want to access the products, then do it like this:

{{ obj.shop.product.title }}
{{ obj.shop.product.price }}

{{ obj.shop.product2.title }}
{{ obj.shop.product2.price }}

{{ obj.shop.product3.title }}
{{ obj.shop.product3.price }}

更新

好吧，在这种情况下，我建议使用 ManyToMany 产品与商店之间的关系.因此，可以将一个产品分配给多个商店，也可以将一个商店分配给多个产品.然后，您可以这样定义关系:

Update

Well, in that case I would recommend using ManyToMany relation between Product and Shop. So that, a product can be assigned to multiple shops, or a shop can be assigned to multiple product. Then you can define the relation like this:

class Shop(models.Model):
    products = models.ManyToManyField(Product)

，如果您想遍历商店的产品，可以这样做:

and if you want iterate through products for a shop, you can do it like this:

{% for product in obj.shop.products.all %}
      {{ product.title }}
      {{ product.name }}
{% endfor %}

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