Django modelformset returns the same data inserted in the previous insert when opening the same page for inserting new data

[Guruprasad]

# models.py
import datetime

from django.db import models


class Category(models.Model):
    category_name = models.CharField(unique=True, max_length=100)
    is_enabled = models.BooleanField(default=True)
    created_date = models.DateField(default=datetime.date.today)

    def __unicode__(self):
        return self.category_name

class Website(models.Model):
    url = models.URLField(unique=True)
    site_name = models.CharField(max_length=100)
    vertical_category = models.ForeignKey(Category, related_name="websites")
    unique_users_per_day = models.IntegerField()
    page_views_per_day = models.IntegerField()
    unique_users_per_month = models.IntegerField()
    page_views_per_month = models.IntegerField()

class Section(models.Model):
    website = models.ForeignKey(Website, related_name="sections")
    url = models.URLField(unique=True)
    section_name = models.CharField(max_length=100)

# forms.py
from django import forms
from django.forms.models import modelformset_factory, BaseModelFormSet
from .models import Website, Section


class AddWebsiteForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(AddWebsiteForm, self).__init__(*args, **kwargs)
        self.fields['unique_users_per_day'].widget = forms.TextInput()
        self.fields['page_views_per_day'].widget = forms.TextInput()
        self.fields['unique_users_per_month'].widget = forms.TextInput()
        self.fields['page_views_per_month'].widget = forms.TextInput()
        self.fields['vertical_category'].empty_label = "Vertical Category"

    class Meta:
        model = Website
        exclude = []


class AddSectionForm(forms.ModelForm):
    class Meta:
        model = Section
        exclude = ['website',]


class FirstRequiredFormSet(BaseModelFormSet):
    def __init__(self, *args, **kwargs):
        super(FirstRequiredFormSet, self).__init__(*args, **kwargs)
        for form in self.forms:
            form.empty_permitted = False

AddSectionFormSet = modelformset_factory(Section, AddSectionForm, formset=FirstRequiredFormSet)

# views.py
from django.shortcuts import render, redirect
from django.core.urlresolvers import reverse_lazy
from django.forms.formsets import INITIAL_FORM_COUNT

from .forms import AddWebsiteForm, AddSectionFormSet

def add_website(request):
    import pdb; pdb.set_trace()
    if request.method == "POST":

        website_form = AddWebsiteForm(request.POST)
        section_formset = AddSectionFormSet(request.POST)

        if website_form.is_valid() and section_formset.is_valid():
            website = website_form.save()
            sections = section_formset.save(commit=False)

            for section in sections:
                section.website = website
                section.save()

            if 'add_another' in request.POST:
                return redirect(reverse_lazy('login'))
            else:
                return redirect(reverse_lazy('login'))
    else:
        website_form = AddWebsiteForm()
        section_formset = AddSectionFormSet()

    return render(request,
                  "website/add.html",
                  {
                      "website_form" : website_form,
                      "section_formset": section_formset
                  })

<!--website/add.html -->
<form action="" method="post">
<div>
{{ website_form }}
</div>
<div>
{{ section_formset }}
</div>
<input type="submit" value="submit">

After submitting the form for the first time and inserting some data, I visit the same URL for inserting more data. But the form of section formset is pre-populated with the data inserted the previous time.

[Tim Graham]

Any chance the browser is auto-populating the data from the last form fill? If not, this would be a pretty obvious bug so the problem is likely in your code although I don't see anything odd.

[Guruprasad]

Replying to timgraham:

Any chance the browser is auto-populating the data from the last form fill? If not, this would be a pretty obvious bug so the problem is likely in your code although I don't see anything odd.

Tim, I used pdb to render the html on the server side and it is having the data of all the fields in the model populated in the formset when it has to be rendered empty for a GET request. I tried it on a totally different codebase and app and I could see the same issue.

[Tim Graham]

I think you need to look it inlineformset_factory and/or BaseInlineFormSet. As far as I can tell, BaseModelFormSet is working ​as documented.