If the python function "is_valid" has an exception, how do I keep the input values that were entered on the django form? I did search, maybe I don't know a better way to search. If there is a better way to use a Parent Child model, please tell me.
First I save the Parent model, then save the Child model in same view.
On exception, I want to rollback Parent and redirect user back to the same page with the fields populated with their values.
I have combined 2 forms, each uses a different model. I'm using class-based views.
The line below "_starting", (print(forms), gives me:
{'parent_form': <Parent_2testForm bound=True, valid=True, fields=(title_test;modelname_id)>, 'child_form': <Child_testForm bound=True, valid=True, fields=(content_test)>}
urls.py
path('newpos/parent2',views.Parent2.as_view(),name='parent2'),
Models.py
class Parent_test(models.Model):
title_test = models.CharField(max_length=50)
modelname_id = models.IntegerField(null=False, default=0, unique=False)
class Child_test(models.Model):
content_test = models.TextField()
id_key = models.IntegerField(null=False, default=0, unique=False)
parent_test = models.ForeignKey(Parent_test, on_delete=models.CASCADE)
forms.py
class Parent_2testForm(ModelForm):
class Meta:
model = Parent_test
fields = ('title_test', 'modelname_id', )
widgets = {
'modelname_id': forms.TextInput(attrs={'type': 'hidden'}),
}
class Child_testForm(ModelForm):
class Meta:
model = Child_test
fields = ('content_test',)
Views.py
class Parent2(MultiModelFormView):
form_classes = {
'parent_form': Parent_2testForm,
'child_form': Child_testForm,
}
def __init__(self, title_test="", content_test="", *args, **kwargs):
self.title_test = title_test
self.content_test = content_test
template_name = 'newpos/parent2.html'
def get_success_url(self):
return reverse('new_purchase_order')
def forms_valid(self, forms):
print("__c_inside_Parent2_forms_valid")
try:
with transaction.atomic():
print("_______starting______")
print(forms)
parentsave = forms['parent_form'].save()
parentsave.modelname_id = parentsave.id
Parent_test.objects.update_or_create(id=parentsave.id, defaults={'modelname_id': parentsave.id})
child2 = forms['child_form'].save(commit=False)
child2.parent_test_id = parentsave.id
child2.id_key = parentsave.id
child3 = child2
child3.save()
except ValueError as e:
amsg = "__ValueERROR_exception_" + str(e)
# raise # to remove record saved in Parent
context = {}
messages.error(self.request, amsg)
return HttpResponseRedirect(self.request.path_info)
except Exception as e:
amsg = "__ERROR_exception_" + str(e)
# raise # to remove record saved in Parent
messages.error(self.request, amsg)
return HttpResponseRedirect(self.request.path_info )
return super(Parent2, self).forms_valid(forms)
I want to send the input values back in the form.
I have tried "request" option, but that did not work.
