id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
29160	Django ModelForm doesn't parse foreign keys in initial= kwarg.	Hameer Abbasi	nobody	"Django forms don't parse foreign keys in the `initial=` kwarg. It gives a ""NOT NULL constraint failed"" even if the said data has been specified. This is inconvenient for forms since an `instance` can be specified but critical for formsets where it can't.

Relevant files:

`models.py`
{{{
#!div style=""font-size: 80%""
Code highlighting:
  {{{#!python
from django.db import models


class BaseModel(models.Model):
    pass


# Create your models here.
class SimpleModel(models.Model):
    field = models.IntegerField(default=0)
    hidden_fk = models.ForeignKey(BaseModel, null=False)
  }}}
}}}

`forms.py`
{{{
#!div style=""font-size: 80%""
Code highlighting:
  {{{#!python
from django import forms

from . import models


class SimpleForm(forms.ModelForm):
    class Meta:
        model = models.SimpleModel
        fields = ['field']


SimpleFormset = forms.modelformset_factory(models.SimpleModel, fields=['field'], extra=3)  
  }}}
}}}

`views.py`
{{{
#!div style=""font-size: 80%""
Code highlighting:
  {{{#!python
from django import views
from django.template import loader
from django.http import HttpResponse

from . import forms
from . import models


# Create your views here.
class FormView(views.View):
    template = 'thing/form.html'

    def get(self, request):
        context = {'form': forms.SimpleForm()}
        template = loader.get_template(self.template)

        return HttpResponse(template.render(context, request))

    def post(self, request):
        base_model = models.BaseModel.objects.get(id=1)
        form = forms.SimpleForm(request.POST, initial={'hidden_fk': base_model})
        context = {'form': form}
        template = loader.get_template(self.template)

        simple_model = form.save(commit=False)
        simple_model.field = 1
        form.save()

        return HttpResponse(template.render(context, request))


class FormSetView(views.View):
    template = 'thing/formset.html'

    def get(self, request):
        context = {'formset': forms.SimpleFormset()}
        template = loader.get_template(self.template)

        return HttpResponse(template.render(context, request))

    def post(self, request):
        base_model = models.BaseModel.objects.get(id=1)

        formset = forms.SimpleFormset(
            request.POST,
            initial=[{'hidden_fk': base_model}] * forms.SimpleFormset.extra
        )

        context = {'formset': formset}
        template = loader.get_template(self.template)

        if formset.is_valid():
            formset.save()

        return HttpResponse(template.render(context, request))
  }}}
}}}"	Bug	new	Forms	1.11	Normal		initial		Unreviewed	0	0	0	0	0	0