Override Django ModelForm's Clean_unique method - django

Question

I am working on a django app where i have a model which have a field with attribute unique=True. I am trying to save data in this model using ModelForm. My model and Model form is like this.
My models.py
class MyModel(models.Model):
field1 = models.CharField(max_length=40, unique=True)
def __unicode__(self):
return self.field1
class DuplicateFields(models.Model):
field1 = models.CharField(max_length=30)
class MyModelForm(forms.ModelForm):
class Meta:
model = MyModel
def clean_field1(self):
value = self.cleaned_data['field1']
if value :
if MyModel.objects.filter(field1=value).count() > 0:
DuplicateFields.objects.create(field1=value)
return Value
raise forms.ValidationError('this field is required')
**I tried below given code also but it also raise Unique field Exception or error **
def clean_unique(form, field, exclude_initial=True,
value = form.cleaned_data.get(field)
if value:
objs = MyModel.objects.filter(field1=value)
if objs.count() > 0:
DuplicateFields.objects.create(field1=value)
return value
def clean_field1(self):
value=clean_unique(self,'field1')
**My Views.py is **
if request.method=='POST':
form = MyModelForm(request.POST)
if form.is_valid():
cleaned_data = form.cleaned_data
field = cleaned_data['field1']
form.save()
return HttpResponse('form has been saved successfully')
else:
print 'form is invalid'
print form._errors
return render_to_response(template_name, {'form':form}, ci)
else:
return render_to_response(template_name, {'form':form}, ci)
What i want to do is while saving the data or calling form.is_valid() method if i found that the data i am trying to store already exists in model then instead of raising a validation error i want to perform some other logic like will store it in some other model.
But in my view when i am calling 'form.is_valid()` it is returning False. Give me some suggestions. Help will be appreciated

Answer 1

To stop giving validate unique modelform exception what you can do is just override the django ModelForm's validate_unique method. like
class MyModelForm(forms.ModelForm):
class Meta:
model = MyModel
def validate_unique(self):
exclude = self._get_validation_exclusions()
try:
self.instance.validate_unique(exclude=exclude)
except forms.ValidationError as e:
try:
del e.error_dict['field1'] #if field1 unique validation occurs it will be omitted and form.is_valid() method pass
except:
pass
self._update_errors(e) #if there are other errors in the form those will be returned to views and is_valid() method will fail.
and in your view check
if form.is_valid():
field1=form.cleaned_data['form1']
try:
MyModel.objects.get(field1=field1)
#write your logic here for duplicate entry
except:
MyModel.objects.create(field1=field1)
return render_to_response('template.html')
else:
return render_to_response('template.html')