Nested loop in Django template - django

Question

I can't get my head around this. I need to somehow access the object in the parent loop but I'm not sure how. Here is what I've come up with so far. I marked the problematic area in the code with XXX:
Template:
{% for item in ingrcat %}
<h2>{{ item.name }}</h2>
<ul>
{% for ingr in XXX %}
<li>{{ ingr.name }}</li>
{% endfor %}
</ul>
{% endfor %}
XXX - should be a list of ingredients belonging to the ingredience category which is currently being looped through in the parent loop.
View:
def home(request):
if request.user.is_authenticated():
username = request.user.username
email = request.user.email
foods = Food.objects.filter(user=request.user).order_by('name')
ingredients = Ingredience.objects.filter(user=request.user).order_by('name')
ingrcat = IngredienceCategory.objects.filter(user=request.user)
context = {}
for i in ingredients:
context[i.category.name.lower()] = context.get(i.category.name.lower(), []) + [i]
newcontext = {'foods': foods, 'ingredients': ingredients, 'ingrcat': ingrcat, 'username': username, 'email': email,}
else:
context = {}
newcontext = {}
context = dict(context.items() + newcontext.items())
return render_to_response('home.html', context, context_instance=RequestContext(request))
Models:
from django.db import models
from django.contrib.auth.models import User
class IngredienceCategory(models.Model):
name = models.CharField(max_length=30)
user = models.ForeignKey(User, null=True, blank=True)
class Meta:
verbose_name_plural = "Ingredience Categories"
def __unicode__(self):
return self.name
class Ingredience(models.Model):
name = models.CharField(max_length=30)
category = models.ForeignKey(IngredienceCategory, null=True, blank=True)
user = models.ForeignKey(User, null=True, blank=True)
class Meta:
verbose_name_plural = "Ingredients"
def __unicode__(self):
return self.name
class Food(models.Model):
name = models.CharField(max_length=30)
ingredients = models.ManyToManyField(Ingredience)
html_id = models.CharField(max_length=30, null=True, blank=True)
user = models.ForeignKey(User, null=True, blank=True)
class Meta:
verbose_name_plural = "Foods"
def __unicode__(self):
return self.name

Answer 1

You can use backwards relationships.
{% for item in ingrcat %}
<h2>{{ item.name }}</h2>
<ul>
{% for ingr in item.ingredience_set.all %}
<li>{{ ingr.name }}</li>
{% endfor %}
</ul>
{% endfor %}
See documentation:
https://docs.djangoproject.com/en/dev/topics/db/queries/#following-relationships-backward

Answer 2

Do get_queryset on obj.manytomanyfield
{% for item in ingrcat %}
<h2>{{ item.name }}</h2>
<ul>
{% for ingr in item.ingredients.get_queryset %}
<li>{{ ingr.name }}</li>
{% endfor %}
</ul>
{% endfor %}