Django model cross reference in templatre - django

Question

Ok So my mind is going to mush...
I have 2 models. One is a card location and the other holds card types. I've got a view and template which display's the cards in a specific chassis. What I can't seem to get to work is the foreign key reference. I want to display the CardType.sName in the template.
I'm certain i've just done something stupid ...
Models.py:
class CardLocation(models.Model):
chassis = models.ForeignKey(Chassis)
slot = models.CharField(max_length=20)
slot_sub = models.CharField(max_length=20)
CardType = models.ForeignKey(CardType)
PartNum = models.CharField(max_length=200)
ProdID = models.CharField(max_length=200)
versID = models.CharField(max_length=200)
serialNum = models.CharField(max_length=200)
cleiCode = models.CharField(max_length=200)
lastSeen = models.DateTimeField()
isActive = models.BooleanField(default=0)
def __unicode__(self):
return self.slot
class CardType(models.Model):
sName = models.CharField(max_length=5)
lName = models.CharField(max_length=200)
description = models.CharField(max_length=200)
def __unicode__(self):
return self.sName
views.py
class DetailView(generic.ListView):
model = CardLocation
template_name = 'chassis/detail.html'
context_object_name = 'cardLoc'
def get_queryset(self):
#chassis_id = get_object_or_404(CardLocation, chassis_id__iexact=self.args[0])
chassis_id = self.args[0]
return CardLocation.objects.filter(chassis_id=chassis_id)
def get_context_data(self, **kwargs):
# Call the base implementation first to get a context
context = super(DetailView, self).get_context_data(**kwargs)
# Add in the
context['chassisQ'] = Chassis.objects.get(id=self.args[0])
#context['CardType'] = CardType.objects.order_by()
return context
detail.html
{% load staticfiles %}
<h2>
<table>
<tr><td>Name:</td><td>{{ chassisQ.name }}<td></tr>
<tr><td>Owner:</td><td>{{ chassisQ.owner }}<td></tr>
<tr><td>ip Adress:</td><td>{{ chassisQ.ipAddr }}<td></tr>
<tr><td>Last updated:</td><td>{{ chassisQ.lastSeen }}<td></tr>
</table>
</h2>
{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}
{% if cardLoc %}
<table border=1>
<tr><td>slot</td><td>Type</td><td>Part Number</td><td>Product ID/</td><td>Version ID</td><td>Serial Num</td><td>CLEI code</td></tr>
{% for card in cardLoc %}
<tr>
<td align="right">{{ card.slot }}</td>
<td>Type {{ card.cardtype__set.all.sName }} </td> <!-- DISPLAY sName HERE -->
<td>{{ card.PartNum }}</td>
<td align="right">{{ card.ProdID }}/</td>
<td align="left">{{ card.versID }}</td>
<td>{{ card.serialNum }}</td>
<td>{{ card.cleiCode }}</td>
</tr>
{% endfor %}
</table>
{% else %}
<p>No cards are available...</p>
{% endif %}

Answer 1

A Card has numerous CardTypes (as it's a ForeignKey relationship), not just one. You have:
<td>Type {{ card.cardtype__set.all.sName }} </td>
You need to loop through all the CardTypes related to the Card:
{% for card in cardLoc %}
...
{% for cardtype in card.cardtype__set.all %}
<td>Type {{ cardtype.sName }}</td>
{% endfor %}
...
{% endfor %}