If you print:
dir(form_instance)
You'll get the methods available to the form. From memory, amongst
these you will find "data" and "initial", I think that "data"
contains the information submitted in the form action. So, to show that:
print(form.data)
-- Clive
On 2 Jan 2023, at 00:12, Noel Duffy wrote:
I'm new to Django, though not to programming. I'm using Django
4.1.4 on AlmaLinux 9.
My question is this. Is it possible to access a ModelForm field's
value if that form field failed validation?
I'm writing a small ticketing system for a helpdesk to handle spam
reports. Users submit spam messages which the system will then
process. I'm using a ModelForm, and the database schema specifies
that the spam message is unique. That is, each spam message can be
reported only once, so there's just one ticket but possibly many
different actions taken depending on what's in the spam.
This is the model:
class AbuseReport(models.Model):
report_date = models.DateTimeField(auto_now_add=True)
report_subject = models.CharField(max_length=255)
report_msgid = models.CharField(max_length=255, unique = True)
report_spam_text = models.TextField(unique = True)
def __str__(self):
return report_subject
class Meta:
ordering = ['-report_date']
Now, the problem is that a spam message will fail form validation
in the form.is_valid call if the spam message fails the "unique"
constraint. Why is this a problem? Because I want to get my hands
on the spam message if it's already in the DB so that instead of
just re-showing my form with an error message saying the spam
already exists, I want to redirect to the existing ticket. But so
far I've not been able to figure out how to do this, and when I
dump the contents of the form in debugging, the spam message just
isn't there.
I should add that the ModelForm only creates a field for the
report_spam_text field. I.e,
class AbuseReportForm(ModelForm):
def __init__(self, *args, **kwargs):
super(ModelForm, self).__init__(*args, **kwargs)
def clean(self):
[...]
class Meta:
model = AbuseReport
fields = ['report_spam_text']
widgets = {'report_spam_text':
Textarea(attrs={
'rows': 20,
'class':'textarea',
'placeholder':'Paste spam with full headers
here..'
}),}
This is what my view looks like (stripped down for simplicity):
def spamsubmit(request):
# if this is a POST request we need to process the form data
if request.method == 'POST':
# create a form instance and populate it with data from the
request:
form = AbuseReportForm(request.POST)
# check whether it's valid:
if form.is_valid():
# process the data in form.cleaned_data as required
[.....]
else:
## show the form again with errors displayed
## if spam already exists this is what gets run.
return render(request, 'abuse/spam_form.html',
{'form':form})
As I understand it, fields aren't bound to data until is_valid is
called, and if is_valid fails then only fields that didn't fail
validity go into cleaned_data. But it seems everything else is
lost. But I'm not 100% sure about this and this is why I'm asking.
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