如何在 Django 模板中设置过滤器

Question

I have a custom template tag which verifies the user's group but when I use it as a template filter in an HTML template it is bugging out all over the place.

This is my custom template tag:

@register.filter(name='is_in_group')
def is_in_group(user, group_name):
    group = Group.objects.get(name=group_name)
    return True if group in user.groups.all() else False

This is the first filter in the template - which is letting every user through (even users outside these groups):

{% if request.user|is_in_group:"food bev supervisor"  or "casino supervisor" or "security supervisor" or "cage supervisor" %}

But if I change the ordering to:

{% if request.user|is_in_group:"casino supervisor" or "food bev supervisor" or "security supervisor" or "cage supervisor" %}

... the code fails (lets no users through).

If I set only one group as such:

{% if request.user|is_in_group:"food bev supervisor" %}

then the filter works correctly (but I cannot set more than one group).

Is this a bug in Django? What is the best way around this?

Answer 1

I was able to solve this by applying the filter to each variable as such:

{% if request.user|is_in_group:"food bev supervisor" or request.user|is_in_group:"casino supervisor" or request.user|is_in_group:"security supervisor" or request.user|is_in_group:"cage supervisor" %}

It isn't pretty or Pythonic but at least it works. The Django convention is a little odd here but after trying a lot of different ways I believe this one is the correct way.