django: How to make one form from multiple models containing foreignkeys
- by Tim
I am trying to make a form on one page that uses multiple models. The models reference each other. I am having trouble getting the form to validate because I cant figure out how to get the id of two of the models used in the form into the form to validate it. I used a hidden key in the template but I cant figure out how to make it work in the views
My code is below:
views:
def the_view(request, a_id,):
if request.method == 'POST':
b_form= BForm(request.POST)
c_form =CForm(request.POST)
print "post"
if b_form.is_valid() and c_form.is_valid():
print "valid"
b_form.save()
c_form.save()
return HttpResponseRedirect(reverse('myproj.pro.views.this_page'))
else:
b_form= BForm()
c_form = CForm()
b_ide = B.objects.get(pk=request.b_id)
id_of_a = A.objects.get(pk=a_id)
return render_to_response('myproj/a/c.html',
{'b_form':b_form,
'c_form':c_form,
'id_of_a':id_of_a,
'b_id':b_ide })
models
class A(models.Model):
name = models.CharField(max_length=256, null=True, blank=True)
classe = models.CharField(max_length=256, null=True, blank=True)
def __str__(self):
return self.name
class B(models.Model):
aid = models.ForeignKey(A, null=True, blank=True)
number = models.IntegerField(max_length=1000)
other_number = models.IntegerField(max_length=1000)
class C(models.Model):
bid = models.ForeignKey(B, null=False, blank=False)
field_name = models.CharField(max_length=15)
field_value = models.CharField(max_length=256, null=True, blank=True)
forms
from mappamundi.mappa.models import A, B, C
class BForm(forms.ModelForm):
class Meta:
model = B
exclude = ('aid',)
class CForm(forms.ModelForm):
class Meta:
model = C
exclude = ('bid',)
B has a foreign key reference to A, C has a foreign key reference to B. Since the models are related, I want to have the forms for them on one page, 1 submit button. Since I need to fill out fields for the forms for B and C & I dont want to select the id of B from a drop down list, I need to somehow get the id of the B form into the form so it will validate. I have a hidden field in the template, I just need to figure how to do it in the views
