Every form validation in formset - django

Question

Some troubles with validation.
I'm using this construction in my template:
<form method="POST">
{% csrf_token %}
{{ formset.media.js }}
{% for form in formset %}
<p>{{ form }}</p>
{% endfor %}
<button type="submit" class="btn btn-primary">Send</button>
And this validation in views:
def flow_type(request):
patternFormset = modelformset_factory(CashFlowPattern, fields='__all__')
if request.method == 'POST':
formset = patternFormset(request.POST)
if formset.is_valid():
formset.save()
formset = patternFormset()
template = 'cash_table/index.html'
context = {
# 'form': form,
'formset': formset
}
return render(request, template, context)
I get form at page but nothing happens after submit.
But if I use another template construction it works:
<form method="POST">
{% csrf_token %}
{{ formset.media.js }}
{{ formset }}
<button type="submit" class="btn btn-primary">Send</button>
</form>
But then I get all fields of new form at the same line.

Answer 1

I think you need to have {{ formset.management_form }} in the template where you iterate through the forms of the formset so that Django knows that it is a formset, and knows how many forms are in the formset, etc...
<form method="POST">
{% csrf_token %}
{{ formset.management_form }}
{{ formset.media.js }}
{% for form in formset %}
<p>{{ form }}</p>
{% endfor %}
<button type="submit" class="btn btn-primary">Send</button>
When you use {{ formset }} the management is done automatically (it's a shortcut).
Source: https://docs.djangoproject.com/en/4.1/topics/forms/formsets/#custom-formset-validation