form is not valid... WHY? - django

Question

the model:
class Operation(models.Model):
operation_type = models.ForeignKey(OperationType)
category = models.ForeignKey(Category, default=0)
related_account = models.ForeignKey(Account, related_name = 'related_account', null = True)
comments = models.TextField(null = True)
the code:
def detail(request, category_id):
class OperationCategoryOnlyForm(forms.ModelForm):
class Meta:
model = Operation
fields = ('operation_type', 'category', 'related_account', )
from django.forms.models import modelformset_factory
OperationFormSet = modelformset_factory(Operation, form=OperationCategoryOnlyForm)
if request.method == "POST":
formset = OperationFormSet(request.POST, queryset=Operation.objects.filter(category=category_id))
if formset.is_valid():
formset.save()
# HERE IS THE FORMSET, WHICH OVERLAPS THE POSTED FORMSET - this was intentionaly to get the current result not result before save, but when you want to debug - you should pay attention at such things.
# formset = OperationFormSet(queryset=Operation.objects.filter(category=category_id))
c = {"formset" : formset,}
c.update(csrf(request))
return render_to_response("reports/operation_list.html", c)
the template: UPDATED:
<form method="post" action="">
{% csrf_token %}
{{ formset.management_form }}
{{ formset.errors }}
{{ formset.non_field_errors }}
{{ formset.non_form_errors }}
<table>
{% for form in formset.forms %}
tr><td> {{ form.errors }} </td><td> {{ form.non_field_errors }}</td></tr>
<tr><td>{{ form.id }}</td><td>{{ form.instance.comments }}</td><td>{{ form.operation_type }}<br>{{ form.related_account }}</td><td>{{ form.category }}</td></tr>
{% endfor %}
</table>
<input type="submit" value="submit">
</form>
I found that form.is_valid() = false - but i have no idea how to get the reason WHY...
UPD - I updated the template according to comment - nothing is result....
(this is very stupid rule, that i have to write less code than question - code is self explaining and is the essence of question - Almost always the question reduces into one sentence but there's no way to reduce code)

Answer 1

Yeah, because you're creating another, empty formset before displaying it. Add print formset.errors before or directly after if checking for is_valid().