Question

So I have a User model and a Dinner model. They are associated by a LotteryEntry model. (aka people have to enter a lottery to be chosen to go to a dinner)

Lets say I have a query set of Dinners like this:

first_page_dinners = Dinner.objects.all().order_by('-created_at')[:5]

And the QuerySet of ‘lotteries’ for the currently logged in user

entries = LotteryEntry.objects.filter(user=request.user)

Now in the template I am looping through the Dinner objects, but also want to check if the person has already entered a lottery for that dinner… so something like this:

{% for d in dinners %}
   {% if entries.contains(d) %}
   //custom html here if user has already entered lottery
   {% endif %}
{% endfor %}

However the ‘.contains’ isn’t a real thing. Does django/python provide a nice little method like this?

Answer 1

Try using values_list, so it would be easier to check if an object exists:

dinner_entries = LotteryEntry.objects.filter(user=request.user).values_list('dinner__id', flat=True)

In your template, you can check like this:

{% if d.id in dinner_entries %}