django - 相关产品

Question

在我的模型中，我可以ManyToManyField选择相关产品。我想知道将这些带入我的视图并在我的模板中呈现它们的最佳方式是什么。

模型.py

class Product(models.Model): 
    title = models.CharField(max_length=80)
    category = models.ManyToManyField(ProductCategory)
    featured_image = models.ImageField(upload_to=image_dir)
    about_this_product = models.TextField()
    standard_features = models.TextField(null=True)
    featured = models.BooleanField(default=False)
    related_models = models.ManyToManyField("self", blank=True, null=True)
    model_slug = AutoSlugField(null=True, default=None,
                         unique=True, populate_from='title')

    class Meta:
        verbose_name_plural = "Products"

    def __str__(self):
        return self.title

视图.py

def model_detail_view(request, category_slug, model_slug):
    product_model = get_object_or_404(Product, model_slug=model_slug) 
    context = {
        "title": "Products | %s" % product_model.title,
        "product": product_model,
    }
    return render(request=request, template_name='main/product_model_detail.html', context=context)

标签： djangodjango-modelsdjango-viewsdjango-templates

Answer 1

您可以.prefetch_related(..)像在视图中的任何一对多关系上一样使用：

def my_view(request):
    products = Product.objects.prefetch_related('related_models')
    return render(request, 'some_template.html', {'products': products})

然后在模板中，您可以遍历.related_models集合：

{% for product in products %}
    {{ product.title }}
    related:
    {% for rel in product.related_models.all %}
        {{ rel.title }}
    {% endfor %}
{% endfor %}