To start off, I have two models:
class Category(models.Model):
name = models.CharField(maxlength=50)
visible = models.BooleanField(default=True)
class Forum(models.Model):
category = models.ForeignKey(Category)
name = models.CharField(maxlength=50)
visible = models.BooleanField(default=True)
I want to display a list of the forums, grouped by categories (see
below). If a category is marked invisible, I don't want to show any
forums, even if they are marked visible. If there are no forums in a
category, I still want to display the category title.
<h2>category</h2>
<p>forum name</p>
<p>forum name</p>
<h2>category</h2>
<p>no forums in this category</p>
I have my view and template setup like this:
def index(request):
categories = Category.objects.filter(visible=True)
{% for category in categories %}
<h2>{{ category.name }}</h2>
{% if category.forum_set.count %}
{% for forum in category.forum_set.all %}
<p>{{ forum.name }}</p>
{% endfor %}
{% else %}
<p>no forums in this category</p>
{% endif %}
{% endfor %}
This does hide invisible categories, but the problem is that it shows
all forums, regardless of whether they are marked visible.
Another solution I came up with is to do this in the view:
def index(request):
forums = Forum.objects.filter(visible=True, category__visible=True)
Using this method, I can just loop through the forums dict and use an
{% ifchanged %} to display the category names. The problem with this is
that I can't display the category name if there are no forums in it.
Is it possible to do what I want? I'm sure theres a way (maybe using
the extra() method), I just can't figure it out.I hope I made my
question clear enough.
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