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Django ModelForm not getting instance data

I have a model form that have multiple choice fields. using AJAX to update form choic fields upon changed field.
Model:
class Student(models.Model):
CLASSROOM = 0
GROUPROOM = 1
HOMEROOM = 3
STUDENT_RECORD_TYPES = [
(CLASSROOM,_("Classroom")),
(GROUPROOM,_("Group")),
(HOMEROOM,_("Home Edu")),
]
school = models.ForeignKey(School,on_delete=models.CASCADE,blank=False,related_name='student_records')
grade = models.ForeignKey(Grade,on_delete=models.CASCADE,blank=False,related_name="student_records")
record_type = models.PositiveSmallIntegerField(_("Record Type"),choices=STUDENT_RECORD_TYPES,default=0)
class Meta:
constraints = [
models.UniqueConstraint(
fields=['school','grade', 'record_type'],
name='unique_school_grade_record'
),
]
def __str__(self):
return "Record ID: {}".format(self.pk)
Views.py:
def update_students(request,pk):
updated_table=None
student_record = get_object_or_404(Student,pk=pk)
if request.POST:
form = StudentForm(request.POST or None,instance=student_record)
if form.is_valid():
form.save()
messages.success(request,_("Student record Updated Successfully!"))
#Getting data for view
updated_table = update_students_table(request)
else:
messages.error(request,_("Invalid Input, Please check!"))
else:
form = StudentForm(request.GET or None,instance=student_record)
context = {}
# load form template
context['form'] = form
form_template_path = "components/forms/student_update.html"
html_form = loader.render_to_string(form_template_path, context, request)
context['form'] = html_form
return JsonResponse(context)
Forms.py:
class StudentForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(StudentForm, self).__init__(*args, **kwargs)
for visible in self.visible_fields():
visible.field.widget.attrs['class'] = 'form-control'
self.fields['school'].widget.attrs['class'] += ' select2'
#the issue stands here
#self.data.get('school') returns none even if its exist in form data
if self.data.get('school'):
self.fields['grade'].queryset = Grade.objects.filter(school=self.data.get('school'))
else:
self.fields['grade'].queryset = Grade.objects.none()
class Meta:
model = Student
fields = '__all__'
the strange behavior drives me crazy because when I reselect the school it updates the grade choices normally (with no option selected!), but when I open edit instance form the data is there but grade field have no options in it!

Django - NOT NULL constraint failed

I'm currently working on a Django app that will parse the contents of an uploaded log file to the associated database in my Django project. I've managed to get it all running as expected except it won't associate my uploaded data with the model's ForeignKey. I can assign null=True which resolves the integrity error but then of course, it doesn't assign any of the uploaded data to that ForeignKey. Here's the code:
models.py
class Case(models.Model):
case_ref = models.CharField(max_length=8)
oic = models.CharField(max_length=50)
subject = models.CharField(max_length=100)
submitted_date = models.DateTimeField(default=datetime.now, blank=True)
def get_absolute_url(self):
return reverse('case_list', kwargs={'pk': self.pk})
def __str__(self):
return self.case_ref + " " + self.subject
class TeamviewerLogs(models.Model):
case = models.ForeignKey(Case, on_delete=models.DO_NOTHING)
teamviewer_id = models.IntegerField()
teamviewer_name = models.TextField()
connection_start = models.TextField()
connection_end = models.TextField()
local_user = models.TextField()
connection_type = models.TextField()
unique_id = models.TextField()
def get_absolute_url(self):
return reverse('case_list', kwargs={'pk': self.pk})
def __str__(self):
return str(self.teamviewer_id) + " - " + str(self.teamviewer_id)
forms.py
class UploadLog(forms.ModelForm):
file = forms.FileField()
class Meta:
model = TeamviewerLogs
fields = [
'file'
]
views.py
def add_logs(request, pk):
case = get_object_or_404(Case, pk=pk)
if request.method == 'POST':
form = UploadLog(request.POST, request.FILES)
if form.is_valid():
teamviewer = form.save(commit=False)
teamviewer.case = case
log_file = request.FILES['file']
log_file = filter(None, (line.rstrip() for line in log_file))
for lines in log_file:
split = lines.decode('utf-8').split('\t')
teamviewer_id = split[0]
teamviewer_name = split[1]
connection_start = split[2]
connection_end = split[3]
local_user = split[4]
connection_type = split[5]
unique_id = split[6]
teamviewer = TeamviewerLogs(teamviewer_id=teamviewer_id, teamviewer_name=teamviewer_name,
connection_start=connection_start, connection_end=connection_end,
local_user=local_user, connection_type=connection_type, unique_id=unique_id)
teamviewer.save()
return redirect('tv_log_details', pk=case.pk)
form.save()
else:
form = UploadLog()
return render(request, 'teamviewer/add_logs.html', {'form': form})
But when I click to upload the file I'm hit with:
When it tries to execute teamviewer.save().
I've been trying to resolve this issue for hours and have tried so many different variations of answers from Stackoverflow or previous code I've used that has worked for different models but I've hit a brick wall...hard!
Any help anyone can offer would be greatly appreciated.

Ok, so here's an example of the concept I've suggested in the comments.
I've got a view which passes some data to the a form;
class ListingDetailView(DetailView):
""" Listing detail page """
model = Listing
template_name = 'listing.html'
def get_form_kwargs(self):
"""Return the kwargs for the form"""
kwargs = {}
initial = {
'listing': self.object,
}
kwargs['initial'] = initial
return kwargs
def get_form(self):
form = ApplicationSignupForm(
**self.get_form_kwargs()
)
return form
def get_context_data(self, **kwargs):
""" Add our form to the context """
context = super().get_context_data(**kwargs)
context['form'] = self.get_form()
return context
The form then makes use of that initial data and sets the field it relates to as hidden. I don't validate this data, but I'll try to show how you might do that;
class ApplicationSignupForm(forms.ModelForm):
class Meta:
""" Setup the form """
fields = (
'listing',
...
)
model = Application
widgets = {
'listing': forms.HiddenInput()
}
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
initial_data = kwargs['initial']
self.listing = initial_data.get('listing')
def clean(self):
"""
Custom form cleaning
"""
cleaned_data = super().clean()
listing = cleaned_data.get('listing')
if listing != self.listing:
self.add_error('listing', "You can't modify this value")
return cleaned_data

Getting __str__ returned non-string error after adding a form on a page

I have a search bar. After search an order code I want to open a new page with order information and a new form for items at the same page. Searching and getting order information works great. But after add a new form to the page I'm getting an error
TypeError at /paketle/
__str__ returned non-string (type NoneType)
Here is my models:
class Siparisler(models.Model):
siparis_no = models.CharField(max_length=80)
..
class Meta:
verbose_name = "Sipariş"
verbose_name_plural = "Siparişler"
def __str__(self):
return self.siparis_no
class Urunler(models.Model):
urun_adi = models.CharField(max_length=250,blank=True,null=True)
barkod = models.CharField(max_length=60,blank=True,null=True)
class Meta:
verbose_name = "Ürün"
verbose_name_plural = "Ürünler"
ordering = ['pk']
def __str__(self):
return self.urun_adi
class Paket(models.Model):
siparis = models.ForeignKey(Siparisler,on_delete=models.CASCADE,related_name='siparis_paket')
urun = models.ForeignKey(Urunler,on_delete=models.PROTECT,related_name='urun_siparis_paket')
miktar = models.CharField(max_length=6,blank=True,null=True)
class Meta:
verbose_name = "Paket"
verbose_name_plural = "Paketler"
ordering = ['-pk']
def __str__(self):
return self.siparis.siparis_no
my forms.py
from django import forms
from .models import Paket
class PaketForm(forms.ModelForm):
class Meta:
model = Paket
fields = '__all__'
my views here:
my views here:
my views
class Paketleme(CreateView):
model = Paket
template_name = "siparis_paketle.html"
form_class = PaketForm
success_url = '/paketara/'
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
if self.request.POST:
sorgu = self.request.POST.get('sorgu')
query = get_object_or_404(Siparisler, pazar_yeri_kargo_kodu=sorgu)
context['object'] = query
return context
class Paketle(TemplateView):
template_name = "paketleme.html"
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
bekleyensiparis = Siparisler.objects.filter(siparis_durum=1).count()
bugun_siparis = Siparisler.objects.filter(siparis_tarih=datetime.today()).count()
gunsayisi = 3
geciken_siparis = Siparisler.objects.filter(siparis_tarih__gte=datetime.now()-timedelta(days=gunsayisi)).count()
iptaliadesipari = Siparisler.objects.filter(siparis_durum=9).count()
context['iptaliadesipari'] = iptaliadesipari
context['geciken_siparis'] = geciken_siparis
context['bugunsiparis'] = bugun_siparis
context['bekleyen'] = bekleyensiparis
return context
I'm getting error after adding {{form}} on teplate page (siparis_paketle.html).
What is the problem here?

in the model Paket : self.siparis stores "Ids" of Siparisler. You can't use it this way:
def __str__(self):
return self.siparis.siparis_no
Just remove it

Django: Checkbox choice displaying as True/False value

I'm a beginner at django and I'm trying to get my calendar to display a checkbox itself rather than a True/False value. I'm able to get the data to save from the form however
models.py
class Event(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
title = models.CharField(max_length=200)
description = models.TextField(max_length=350)
start_time = models.DateTimeField()
#end_time = models.DateTimeField()
event_checked = models.BooleanField()
#property
def get_html_url(self):
url = reverse('cal:event_edit', args=(self.id, ))
return f' <label> {self.title} {self.event_checked}<label>'
def __str__(self):
return '{} - {} by {}'.format(self.title, self.description, self.user)
forms.py
class EventForm(forms.ModelForm):
event_checked = forms.BooleanField()
class Meta:
model = Event
# datetime-local is a HTML5 input type, format to make date time show on fields
widgets = {
'start_time': DateInput(attrs={'type': 'datetime-local'}, format='%Y-%m-%dT%H:%M'),
}
fields = ('title', 'description', 'start_time')
def __init__(self, *args, **kwargs):
super(EventForm, self).__init__(*args, **kwargs)
# input_formats parses HTML5 datetime-local input to datetime field
self.fields['start_time'].input_formats = ('%Y-%m-%dT%H:%M',)
views.py
def event(request, event_id=None):
instance = Event()
if event_id:
instance = get_object_or_404(Event, pk=event_id)
else:
instance = Event()
form = EventForm(request.POST or None, instance=instance)
if request.POST and form.is_valid():
event = Event.objects.create(**form.cleaned_data, user=request.user)
print(event.title)
return HttpResponseRedirect(reverse('cal:calendar'))
return render(request, 'cal/event.html', {'form': form})
How my calendar looks with some events

I don't know if that was your goal:
class EventForm(forms.ModelForm):
event_checked = forms.BooleanField()
class Meta:
model = Event
# datetime-local is a HTML5 input type, format to make date time show on fields
widgets = {
'event_checked' forms.CheckboxInput(), # <-- added this
'start_time': DateInput(attrs={'type': 'datetime-local'}, format='%Y-%m-%dT%H:%M'),
}
fields = ('title', 'description', 'start_time')
def __init__(self, *args, **kwargs):
super(EventForm, self).__init__(*args, **kwargs)
# input_formats parses HTML5 datetime-local input to datetime field
self.fields['start_time'].input_formats = ('%Y-%m-%dT%H:%M',)

Dynamically alter form fields in views.py file of django

I was wondering if there is a way that I can alter a model form within the views.py file to create a multiple choice dropdown field for form choices. I want to set each option on the choice field from the results of a queryset.
for example:
I want to from_acct field to have a scroll down option with the following list..
wells fargo
chase
tabz
bank of america
the list of banks are results of a query set
Here is what i have so far in the views.py file.
form = TransferForm()
form.fields['from_acct'].queryset = Accounts.objects.filter(user = currentUser).all()
message = 'please fill out the below form'
parameters = {
'form':form,
'currentUser':currentUser,
'message':message,
}
return render(request, 'tabs/user_balance.html', parameters)
here is the forms.py file
class TransferForm(forms.ModelForm):
class Meta:
model = Transfers
fields = ['from_acct', 'to_acct', 'amount', 'memo']
labels = {
'from_acct':'from',
'to_acct':'to',
}
here is the model.py file
class Transfers(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
from_acct = models.CharField(max_length=150, default='account')
to_acct = models.CharField(max_length=150, default='accont')
amount = models.DecimalField(decimal_places=2, max_digits=9, default=0)
memo = models.CharField(max_length=200, default='memo')
frequency = models.SmallIntegerField(default=1)
status = models.SmallIntegerField(default=1)
create = models.DateTimeField(auto_now_add=True)

You can try to set choices arg for CharField by function.
Like that:
class Transfers(models.Model):
field = models.CharField(max_length=255, choices=result_query())
def result_query(self):
# you can use that with self if u need transfers.pk for querying
return Something.objects.exclude(bank_id__in=[bank.id for bank in self.banks.all())
def result_query():
# or there if not
return Something.objects.filter(any_field__gte=123)
For sure, you can realize any logic in the function, so you can dynamically change options for char field.
UPDATE:
Sure, u haven't pass request into the function.
That should be like that:
view.py:
def my_view(request):
if request.method == 'GET':
form = TransferForm(user=request.user)
...
return something here
forms.py
class TransferForm(ModelForm):
class Meta:
model = Transfer
def __init__(self, *args, **kwargs):
user = kwargs.pop('user')
super(TransferForm, self).__init__(*args, **kwargs)
self.fields['accounts'].choices = Accounts.objects.filter(user = currentUser).all()