Django template display different models fields - django

Question

I'm trying to list fields from few models in a table in template. The models are joined by different fields as in below snippet:
models.py:
class Client(models.Model):
clientID = models.IntegerField(primary_key=True)
firstName = models.CharField(max_length=30)
lastName = models.CharField(max_length=50)
pesel = models.CharField(max_length=11)
#property
def loan(self):
return self.loan_set.all().first()
class Loan(models.Model):
clientID = models.ForeignKey(Client, on_delete=models.CASCADE)
loanNo = models.CharField(max_length=10)
class Case(models.Model):
loanID = models.ForeignKey(Loan, on_delete=models.CASCADE)
caseID = models.CharField(max_length=30, primary_key=True)
callForPaymentDate = models.DateField(default=None)
class Phase(models.Model):
caseID = models.ForeignKey(Case, on_delete=models.CASCADE)
phaseTypeID = models.ForeignKey(PhaseType, on_delete=models.CASCADE)
courtID = models.TextField(max_length=200)
class PhaseDetail(models.Model):
caseID = models.ForeignKey(Case, on_delete=models.CASCADE)
phaseTypeID = models.ForeignKey(PhaseType, on_delete=models.CASCADE)
dismissalDate = models.DateField(default=None, blank=True, null=True)
As you see above models are connected by ForeignKey. How do I pass those models in a view (views.py below):
def index(request):
clients = Client.objects.all()
cases = Case.objects.all()
phasedetails = PhaseDetail.objects.all()
phases = Phase.objects.all()
loans = Loan.objects.all()
return render(request, 'erepertorium/index.html',
{'clients': clients, 'cases': cases, 'phasedetails': phasedetails,
'phases': phases, 'loans': loans})
So that I can display different models fields but matched by this ForeignKey?
See below html template:
<table id="case_list" class="display">
<thead>
<tr>
<td>Sygnatura wg Powoda</td>
<td>Sygnatura EPU</td>
<td>PESEL</td>
<td>Numer pożyczki</td>
<td>Imię i nazwisko</td>
</tr>
</thead>
<tbody>
<tr></tr>
{% for c in clients %}
<tr>
<td>{{ c.case.caseID }}</td>
<td>2</td>
<td>{{ c.pesel }}</td>
<td>{{ c.loan.loanNo }}</td>
<td>{{ c.firstName }} {{ c.lastName }}</td>
</tr>
{% endfor %}
</tbody>
</table>
I've read some solutions about class based views etc. but some of the solution would require rebuilding whole models thing (over 200 lines of code). So before I do that I'd like to ask Community for help.

Answer 1

I know two ways that you can achieve it.
First off with a #property:
class Client(models.Model):
clientID = models.IntegerField(primary_key=True)
firstName = models.CharField(max_length=30)
lastName = models.CharField(max_length=50)
#property
def loan(self):
return self.loan_set.all().first()
the template would be:
<td>{{ c.loan.loanNo }}</td>
Or
in template, you access it via the reverse relation
<td>{{ c.loan_set.all.0.loanNo }}</td>
Make sure that before the reverse relation the instance owns the relation. with if self.loan_set.all()(Model) | {% if c.loan_set.all %} (Template)