How to display Data of foreign key in Django html page? - django

Question

I want to display a Company header and the products below its related company. I am new to django i do not understand this fully.
My models.py
class Company(models.Model):
name = models.CharField(max_length=250)
def __str__(self):
return str(self.name)
class Products(models.Model):
company = models.ForeignKey(Company, on_delete=models.CASCADE, related_name="display")
engine = models.CharField(max_length=250, blank=True)
cyl = models.CharField(max_length=250, blank=True)
bore = models.CharField(max_length=250, blank=True)
def __str__(self):
return str(self.engine) + " (ref:" + str(self.ref) + ")"
My views.py:
def Companies(request):
context = {
'categories': Company.objects.all()
}
return render(request, 'product_list.html', context)
My html:
{% for category in categories %}
<h2>{{ category.name }}</h2>
{% for item in category.item_set.all %}
{{ item_engine }}
{% endfor %}
{% endfor %}

Answer 1

only make changes to your HTML file as below and make sure the class name is Product if you are using product_set.all:
{% for category in categories %}
<h2>{{ category.name }}</h2>
{% for item in category.product_set.all %}
{{ item.engine }}
{% endfor %}
{% endfor %}
If still not working then try to remove : + " (ref:" + str(self.ref) + ")"
and also, I think by mistake you have displayed your models.py wrongly. The str functions should be inside the classes like below:
class Company(models.Model):
name = models.CharField(max_length=250)
def __str__(self):
return str(self.name)
class Product(models.Model):
company = models.ForeignKey(Company, on_delete=models.CASCADE,
related_name="display")
engine = models.CharField(max_length=250, blank=True)
cyl = models.CharField(max_length=250, blank=True)
bore = models.CharField(max_length=250, blank=True)
def __str__(self):
return str(self.engine)