How to compare an object in the list with the previous one in a template?

Question

Django

class Order(models.Model):
    title = models.CharField()
    user = models.ForeignKey(User)

views.py
class OrderListView(ListView):
    model = Order

order_list.html
{% for item in order_list %}
    {{item.title}} - {{item.user}}
{% endfor %}

How to check if the next list object contains the same user as the previous one?

Answer 1

itertools.tee + itertools.zip_longest