Related products - django

Question

In my model I have a ManyToManyField to select related products. I'm wondering what would be the best way to bring these into my view and render them in my template.
models.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
views.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)

Answer 1

You can use .prefetch_related(..) just like you do on any one-to-many relation in the view:
def my_view(request):
products = Product.objects.prefetch_related('related_models')
return render(request, 'some_template.html', {'products': products})
Then in the template, you can iterate over the .related_models collection:
{% for product in products %}
{{ product.title }}
related:
{% for rel in product.related_models.all %}
{{ rel.title }}
{% endfor %}
{% endfor %}