CODEWITHSUNDEEP
djangodjango-forms
Cole
Cole

Reputation: 2509

django form invalid after setting it up with a valid instance

I am really confused why this form.is_valid() returns False:

Here is the django model I created:

class aModel(models.Model):
    some_id = models.IntegerField()

I turn the Model into a ModelForm, and create a ModelForm instance with an instance of the Model. Shouldn't this ModelForm instance be valid?

>>> class aModelForm(forms.ModelForm):
...     class Meta:
...             model = aModel
... 
>>> am = aModel.objects.get(id=1)
>>> for k,v in am.__dict__.items(): print k,v
... 
_state <django.db.models.base.ModelState object at 0x1020c8a50>
id 1
some_id 5
>>> form = aModelForm(instance=am)
>>> form.is_valid()
False
>>> am.save()
>>> am.some_id = 6
>>> am.save()
>>>

Why isn't the form valid? What do I need to do to make the form valid?

Upvotes: 1

Views: 2023

Answers (1)

Furbeenator
Furbeenator

Reputation: 8285

It looks like this form is not bound to data, so it cannot validate. You can verify by printing form.is_bound() just before form.is_valid() to verify.

If it is not bound, I don't think you can validate. To bind data, you need to add the data as a dictionary for the first argument to the form.

form = aModelForm({'some_id': am.some_id}, instance=am)
form.is_valid()

See Django - Forms API for more details.

Upvotes: 2

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