Use two models in ListView - django

Question

I have a ListView for every budget category in my list of transactions. For each of these views, I'd like to show the actual budget for this category. For instance, my Bill budget has sub budgets for rent, insurance, phone, etc which is stored in a separate model from the transactions. The current ListView just sends the transactions filtered by budget type:
class BillListView(ListView):
model = Transaction
template_name = 'budget/base_transactions.html'
context_object_name = 'transactions'
paginate_by = 10
queryset = Transaction.objects.filter(budget_type__exact='bill')
Is there a way to send the sub budget data from my budget database as well so I can display it at the top of the template?
My models:
class Transaction(models.Model):
date = models.DateField(default=datetime.date.today)
description = models.CharField(max_length=100, default="")
category = models.CharField(max_length=100, default="")
amount = models.DecimalField(max_digits=10, decimal_places=2, default=0.0)
budget_type = models.CharField(max_length=100, default="")
def __str__(self):
return self.description + ' ' + str(self.amount)
class Budget(models.Model):
category = models.CharField(max_length=100, default="")
sub_category = models.CharField(max_length=100, default="")
amount = models.DecimalField(max_digits=10, decimal_places=2, default=0.0)

Answer 1

If you want to pass data of another model through the ListView, you might be looking for overriding the get_context_data method of ListView. Then you can be able to pass required data along with our model objects.
For example:
In your context, where you want to show data about the budget objects, you can change your BillListView view as:
class BillListView(ListView):
model = Transaction
template_name = 'budget/base_transactions.html'
context_object_name = 'transactions'
paginate_by = 10
queryset = Transaction.objects.filter(budget_type__exact='bill')
def get_context_data(self, **kwargs):
context = super(BillListView, self).get_context_data(**kwargs)
context['budgets'] = Budget.objects.filter(category__exact='bill') //filter as per required
return context
Then you can access the budget objects in the template by looping through budgets as:
{% for budget in budgets %}
{{ budget.amount }}
{{ budget.sub_category }}
{% endfor %}