django access foreignkey value on CreateView class - django

Question

I have a form that submits data, but before submitting to the database it will take the value from foreign first.
here my models.py
class Employee(models.Model):
nik = models.CharField(max_length=100)
name = models.CharField(max_length=100)
def __str__(self):
return self.name
def get_absolute_url(self):
return reverse("system:detail",kwargs={'pk':self.pk})
class EmpLoan(models.Model):
status = models.BooleanField()
nominal = models.DecimalField(max_digits=10, decimal_places=0)
emp = models.ForeignKey(Employee, related_name='emploan')
created_at = models.DateTimeField(auto_now=True)
updated_at = models.DateTimeField(auto_now_add=True, null=True)
def __str__(self):
return self.emp.name
class EmpInstallment(models.Model):
nominal = models.DecimalField(max_digits=10, decimal_places=0)
loan = models.ForeignKey(EmpLoan, related_name='empinstallment')
created_at = models.DateTimeField(auto_now=True)
def __str__(self):
return self.loan.emp.name
view.py
class EmployeeCreateView(CreateView):
fields = ()
model = models.Employee
def form_valid(self, form):
self.object = form.save(commit=False)
data = self.object.EmpLoan.EmpInstallment.object.get(id=1)
self.object.nik = data
self.object.save()
return super(ModelFormMixin, self).form_valid(form)
how to access data on EmpInstallment?...
iam trying use this data = self.object.EmpLoan.EmpInstallment.object.get(id=1)
but it's not working.
iam still learner and very noob on django

Answer 1

EmpInstallment -- > ForeignKey to ---> EmpLoan -----> ForeignKey to ---Employee
class EmployeeCreateView(CreateView):
fields = ()
model = models.Employee
def form_valid(self, form):
employee_instance = form.save(commit=False)
# try to get the emploan instance
emploan = employee_instance.emploan.first()
if emploan:
empinstallment = emploan.empinstallment.first()
if empinstallment:
pass # there you can execute your codes
# there you have access to empinstallment