form.is_valid() failing in Django unit test - django

Question

I'm running a unit test for a Django form, and form.is_valid() keeps returning False and I cannot find the error.
Here's the code for forms.py:
class CustomClearableFileInput(forms.ClearableFileInput):
template_name = 'forums/templates/clearable_file_input.html'
class NewQuestionForm(forms.ModelForm):
category = forms.ModelChoiceField(widget = forms.Select(attrs = {}),
queryset = FossCategory.objects.order_by('name'),
empty_label = "Select a Foss category",
required = True,
error_messages = {'required':'Select a category'})
title = forms.CharField(widget = forms.TextInput(),
required = True,
error_messages = {'required':'Title field required'},
strip=True)
body = forms.CharField(widget = forms.Textarea(),
required = True,
error_messages = {'required':'Question field required'},
strip=True)
is_spam = forms.BooleanField(required = False)
spam_honeypot_field = HoneypotField()
image = forms.ImageField(widget = CustomClearableFileInput(), help_text = "Upload image", required = False)
def clean_title(self):
title = str(self.cleaned_data['title'])
if title.isspace():
raise forms.ValidationError("Title cannot be only spaces")
if len(title) < 12:
raise forms.ValidationError("Title should be longer than 12 characters")
if Question.objects.filter(title = title).exists():
raise forms.ValidationError("This title already exist.")
return title
def clean_body(self):
body = str(self.cleaned_data['body'])
if body.isspace():
raise forms.ValidationError("Body cannot be only spaces")
if len(body) < 12:
raise forms.ValidationError("Body should be minimum 12 characters long")
body = body.replace(' ', ' ')
body = body.replace('<br>', '\n')
return body
class Meta(object):
model = Question
fields = ['category', 'title', 'body', 'is_spam', 'image']
And here's the code for tests.py:
class NewQuestionFormTest(TestCase):
#classmethod
def setUpTestData(cls):
FossCategory.objects.create(name = 'TestCategory', email = 'example#example.com')
def test_too_short_title(self):
category = FossCategory.objects.get(name = "TestCategory")
title = 'shorttitlefsodzo'
form = NewQuestionForm(data = {'category': category, 'title': title, 'body': 'Test question body'})
self.assertTrue(form.is_valid())
This is what I get with print(form.errors):
<ul class="errorlist"><li>category<ul class="errorlist"><li>Select a valid choice. That choice is not one of the available choices.</li></ul></li>

Answer 1

Since it's a model choice field, try using the primary key of the category instead of the instance itself.
form = NewQuestionForm(data = {'category': category.pk, 'title': title, 'body': 'Test question body'})