How to implement the paginator in Django 2.1? - django

Question

To product page of my project I need to add paginator. I did according to the Django Documentation but I have the following error:
object of type 'InsuranceProducts' has no len()
Here is the my views.py:
def farmer_types(request, type_id):
product_areas = InsuranceProducts.objects.filter(product_type="Фермерам")
product_types = get_object_or_404(InsuranceProducts, id=type_id)
paginator = Paginator(product_types, 6)
page = request.GET.get('page')
types = paginator.get_page(page)
context = {'product_types': product_types,
'product_areas': product_areas,
'types': types}
return render(request, 'insurance_products/farmer/farmer_types.html', context)
Here is the my models.py:
class InsuranceProducts(models.Model):
product_area = models.CharField(max_length=100)
product_description = models.TextField()
product_type = models.CharField(max_length=50)
def __str__(self):
return "{}-{}".format(self.product_area, self.product_type)
class ProductType(models.Model):
product_area = models.ForeignKey(InsuranceProducts, on_delete=models.CASCADE)
title = models.CharField(max_length=100)
description = models.TextField()
body = HTMLField('Content')
def __str__(self):
return "{} - {}".format(self.product_area, self.title)
Here is the code from the template:
{% for product in types.producttype_set.all %}
<div class="btmspace-80">
<h3>{{ product.title|upper }}</h3>
<img class="imgr borderedbox inspace-5" src="{% static 'img/imgr.gif' %}" alt="">
<p>
{{ product.description|upper }}
</p>
<p>
Подробно вы можете узнать о новости здесь</a>
</p>
</div>
{% endfor %}
<div class="pagination">
<span class="step-links">
{% if types.has_previous %}
« first
previous
{% endif %}
<span class="current">
Page {{ types.number }} of {{ types.paginator.num_pages }}.
</span>
{% if types.has_next %}
next
last »
{% endif %}
</span>
</div>
<!-- ################################################################################################ -->
</div>
I did the everything as it is given in the Docs.

Answer 1

Why is product_types plural if you are using get_object_or_404, which returns only one object?
You're doing the pagination right, but doing the query wrong. If you change paginator = Paginator(product_types, 6) to paginator = Paginator(product_areas, 6), you will see that it works perfectly fine.
You should read the documentation on how to do queries, and understand the relationships between models.