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Direct assignment to the forward side of a many-to-many set is prohibited. Use coolbox_id.set() instead

89
I am new to Django.I am getting this error when i use many to many field
View
def add_ship(request):
if request.method=='POST':
m_namedriver = request.POST.get('m_namedriver')
driver_id = Driver.objects.get(driver_id=m_namedriver)
m_licensepl = request.POST.get('m_licensepl')
car_id = Car.objects.get(car_id=m_licensepl)
m_weightcoolbox = request.POST.get('m_weightcoolbox')
coolbox_id = Coolbox.objects.get(coolbox_id=m_weightcoolbox)
ship_date = request.POST.get('ship_date')
ship_time = request.POST.get('ship_time')
original = request.POST.get('original')
destination = request.POST.get('destination')
if shipping.objects.count() != 0:
ship_id_max = shipping.objects.aggregate(Max('shipping_id'))['ship_id__max']
next_ship_id = ship_id_max[0:2] + str(int(ship_id_max[2:6])+1)
else:
next_ship_id = "SP1000"
new_shipping = shipping.objects.create(
shipping_id = next_ship_id,
driver_id = driver_id,
car_id = car_id,
coolbox_id = coolbox_id,
ship_date = ship_date,
ship_time = ship_time,
original = original,
destination = destination,
)
new_shipping.save()
new_shipping.shipping.add(coolbox_id)
return render(request,'add_ship.html',{'message1':"Add shipping successful."})
driver_ship = Driver.objects.all()
car_ship = Car.objects.all()
coolbox_ship = Coolbox.objects.all()
return render(request,'add_ship.html',{'driver_ship':driver_ship,'car_ship':car_ship,'coolbox_ship':coolbox_ship})
#
type here
Models
class Coolbox(models.Model):
coolbox_id = models.CharField(max_length=40,primary_key=True)
medicine_name = models.ForeignKey(Medicine, on_delete=models.CASCADE, related_name="medicinename")
weight = models.FloatField(blank=True, null=True)
coolboxtemp_max = models.FloatField(blank=True, null=True)
coolboxtemp_min = models.FloatField(blank=True, null=True)
dimension = models.CharField(max_length=40)
d_measurement = models.CharField(max_length=40)
t_measurement = models.CharField(max_length=40)
total = models.FloatField(blank=True, null=True)
status = models.CharField(max_length=20, choices=STATUS, blank=True)
def __str__(self):
return f"{self.medicine_name}"
class shipping(models.Model):
shipping_id = models.CharField(max_length=15,primary_key=True)
driver_id = models.ForeignKey(Driver, on_delete=models.CASCADE, related_name="driverfk")
car_id = models.ForeignKey(Car, on_delete=models.CASCADE, related_name="carfk")
coolbox_id = models.ManyToManyField(Coolbox, related_name="coolboxfk")
ship_date = models.DateField(blank=True,null=True)
ship_time = models.TimeField(blank=True,null=True)
original = models.CharField(max_length=200)
destination = models.CharField(max_length=200)
def __str__(self):
return f"{self.shipping_id}: {self.driver_id}"
type here

Django model with multi foreign key takes too long to load with forms.ModelChoiceField

I have a django project for student marks.
Models.py
class Registration(CMTracking):
student = models.ForeignKey(Student, on_delete=models.CASCADE)
academic_year = models.ForeignKey(AcademicYear, on_delete=models.CASCADE)
school = models.ForeignKey(School, on_delete=models.CASCADE)
grade = models.CharField(max_length=5, choices=Grade.choices)
school_class = models.ForeignKey(SchoolGradeClass, on_delete=models.CASCADE, blank=True, null=True)
last_year_result = models.PositiveSmallIntegerField(choices=RESULT.choices, blank=True, null=True)
last_grade = models.CharField(max_length=5, choices=Grade.choices, null=True)
date_of_join = models.DateField(null=True, blank=True)
type_of_registration = models.PositiveSmallIntegerField(choices=TypeOfRegistration.choices, default=0, null=True)
type_of_attendance = models.PositiveSmallIntegerField(choices=TypeOfAttendance.choices, null=True)
transfer_from = models.PositiveSmallIntegerField(choices=TransferFrom.choices, blank=True, default=1)
status = models.PositiveSmallIntegerField(choices=RequestStatus.choices, default=0)
class Exam(CMTracking):
fa_name = models.CharField(max_length=70, null=False)
en_name = models.CharField(max_length=70, null=False)
ar_name = models.CharField(max_length=70, null=False)
total_mark = models.DecimalField(max_digits=5, decimal_places=2, default=0)
exam_type = models.PositiveSmallIntegerField(choices=ExamType.choices)
academic_year = models.ForeignKey(AcademicYear, on_delete=models.CASCADE)
class ExamSubject(CMTracking):
exam = models.ForeignKey(to=Exam, on_delete=models.CASCADE)
subject = models.ForeignKey(to=SubjectMaster, on_delete=models.CASCADE)
teacher = models.ForeignKey(Staff, related_name='ExamSubjectList', on_delete=models.CASCADE) # Namavar
school_class = models.ForeignKey(SchoolGradeClass, on_delete=models.CASCADE, blank=True, null=True)
min = models.PositiveSmallIntegerField(null=True)
max = models.PositiveSmallIntegerField(null=True)
class MarkDescriptive(CMTracking):
subject = models.ForeignKey(ExamSubject, on_delete=models.CASCADE)
student = models.ForeignKey(Registration, related_name='mark_list_descriptive', on_delete=models.CASCADE)
goal = models.ForeignKey(to=SubjectGoalsMaster, on_delete=models.CASCADE)
point = models.FloatField(null=True, blank=True)
t2point = models.FloatField(null=True, blank=True)
forms.py:
class MarkDescriptiveModelForm2(forms.ModelForm):
student = forms.ModelChoiceField(queryset=Registration.objects.all().select_related('student__person').filter(school_id=106), required=False)
# student = forms.IntegerField() # only shows the id
goal = forms.ModelChoiceField(queryset=SubjectGoalsMaster.objects.all(), required=False)
point = forms.ChoiceField(choices=DescriptivePoint5.choices)
t2point = forms.ChoiceField(choices=DescriptivePoint5.choices)
class Meta:
model = MarkDescriptive
fields = ['id', 'student', 'point', 't2point']
Views.py:
#login_required()
#require_http_methods(['POST', 'GET', 'PUT'])
def mark_descriptive_update(request, exam_subject_id=None, goal_id=None):
subject = get_object_or_404(ExamSubject, id=exam_subject_id)
goal = get_object_or_404(SubjectGoalsMaster, id=goal_id)
MarkFormset = modelformset_factory(MarkDescriptive, form=MarkDescriptiveModelForm2, extra=0)
marks = subject.markdescriptive_set.all().select_related('subject__exam') \
.select_related('student__academic_year') \
.select_related('student__student__person') \
.select_related('goal').select_related('subject__subject').filter(goal=goal)
formset = MarkFormset(request.POST or None, queryset=marks)
add_url = reverse('add-class')
template = 'school/loaders/load_form.html'
form_template = 'school/pages/exam/mark_descriptive/formset.html'
context = {
# 'form': form,
'records': marks,
'subject': subject,
'goal': goal,
'formset': formset,
'template': template, 'form_template': form_template, 'add_url': add_url}
# if request.method == 'PUT':
if request.method == 'POST':
print(f'\n\n\nrequest is {request.method}\n')
print(f'formset data:{formset.data}')
if formset.is_valid():
print('formset is valid')
for form in formset:
updated_mark = form.save(commit=False)
updated_mark.subject = subject
updated_mark.goal = goal
updated_mark.modified_by = request.user
updated_mark.last_modified = datetime.now()
updated_mark.save()
print('*** \n Marks added succefully !\n***')
else:
print(' form not valid', formset.errors)
return render(request, form_template, context)
issue ::
student = forms.ModelChoiceField(queryset=Registration.objects.all().select_related('student__person').filter(school_id=106), required=False)
Takes too long to load student details I tried to override the form to get only students that are in the same exam but couldn't do that. and overall I do not need at all the student field to be as selection. a normal label of student name is totally enough as the data already populated and teacher will only enter the point.

How Can I Integrate Flutterwave Paymwnt Gate Way with Django

I am working on a Django Project where I want to collect payment in Dollars from Applicants on the portal, and I don't know how to go about it. Though I have been following an online tutorial that shows how to do it but the result I am having is different with the recent error which says 'module' object is not callable.
Remember that I have tested my configured environment and also imported it into my views on top of the page.
Profile model code:
class Profile(models.Model):
applicant = models.OneToOneField(User, on_delete=models.CASCADE, null = True)
surname = models.CharField(max_length=10, null=True)
othernames = models.CharField(max_length=30, null=True)
gender = models.CharField(max_length=6, choices=GENDER, blank=True, null=True)
nation = models.CharField(max_length=255, choices=NATION, blank=True, null=True)
state = models.CharField(max_length=20, null=True)
address = models.CharField(max_length=200, null=True)
phone = models.CharField(max_length=16, null=True)
image = models.ImageField(default='avatar.jpg', upload_to ='profile_images')
def __str__(self):
return f'{self.applicant.username}-Profile'
Education/Referee Model code:
class Education(models.Model):
applicant = models.OneToOneField(User, on_delete=models.CASCADE, null = True)
qualification = models.CharField(max_length=60, choices=INSTITUTE, default=None, null=True)
instition = models.CharField(max_length=40, null=True)
reasons = models.CharField(max_length=100, null=True)
matnumber = models.CharField(max_length=255, null=True)
reference = models.CharField(max_length=100, null=True)
refphone = models.CharField(max_length=100, null=True)
last_updated = models.DateTimeField(auto_now_add=False, auto_now=True)
def __str__(self):
return f'{self.applicant}-Education'
Submitted Model code:
class Submitted(models.Model):
applicant = models.OneToOneField(User, on_delete=models.CASCADE, null=True)
application = models.UUIDField(primary_key = True, editable = False, default=uuid.uuid4)
confirm = models.BooleanField()
approved = models.CharField(max_length=20, null=True)
date = models.DateTimeField(auto_now_add=True)
def save(self, *args, **kwargs):
self.application == str(uuid.uuid4())
super().save(*args, **kwargs)
def __unicode__(self):
return self.applicant
def __str__(self):
return f'Application Number: {self.application}-{self.applicant}'
Scholarship Model code:
class Scholarship(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, null = True)
name = models.CharField(max_length=100, null = True)
description = models.CharField(max_length=200, null = True)
category = models.CharField(max_length=60, choices=INSTITUTE, default=None, null=True)
amount = models.FloatField()
date = models.DateTimeField(auto_now_add=True)
def __str__(self):
return f'WASU Scholarship: {self.name}-{self.name}'
My View for printing slip:
def AppSlip(request):
check_submited = Submitted.objects.get(applicant=request.user)
check_education = Education.objects.get(applicant = request.user)
candidate_edu = check_education.qualification
scholarship = Scholarship.objects.get(category=candidate_edu)
context = {
'candidate_edu':candidate_edu,
'scholarship':scholarship,
}
return render(request, 'user/slip.html', context)
My view for applicant to fill form for payment which I want their Profile captured automatically in the form:
def scholarship_detail(request, pk):
data = Scholarship.objects.get(id=pk)
if request.method=='POST':
form = PaymentForm(request.POST)
if form.is_valid():
user = Profile.objects.get(applicant=request.user)
name= user.surname
email = form.cleaned_data['email']
amount = form.cleaned_data['amount']
phone = form.cleaned_data['phone']
context = {'applicant':name, 'email':email, 'amount':amount, 'phone':phone}
return process_payment(request, context)
else:
form = PaymentForm()
ctx={
'form':form,
'product':data,
}
return render(request, 'user/scholarship.html', ctx)
My form code for Payment: How can query logged in user profile and fill into name, email, phone, amount from Scholarship Model into amount form filled.
class PaymentForm(forms.Form):
name = forms.CharField(label='Your name', max_length=100)
email = forms.EmailField()
phone=forms.CharField(max_length=15)
amount = forms.FloatField()
View code for processing Payment (Where I am suspecting the error). Though I have configured my env using django-dotenv with the Flutterwave Secret Key in it.
#login_required(login_url='user-login')
def process_payment(request, newContext={}):
auth_token= dotenv('SECRET_KEY')
hed = {'Authorization': 'Bearer ' + auth_token}
data = {
"tx_ref":''+str(math.floor(1000000 + random.random()*9000000)),
"amount":amount,
"currency":"KES",
"redirect_url":"http://localhost:8000/callback",
"payment_options":"card",
"meta":{
"consumer_id":23,
"consumer_mac":"92a3-912ba-1192a"
},
"customer":{
"email":email,
"phonenumber":phone,
"name":name
},
"customizations":{
"title":"WASU Scholarship 2022",
"description":"Best store in town",
"logo":"https://getbootstrap.com/docs/4.0/assets/brand/bootstrap-solid.svg"
}
}
url = ' https://api.flutterwave.com/v3/payments'
response = requests.post(url, json=data, headers=hed)
response=response.json()
link=response['data']['link']
return link
My payment Response View:
#require_http_methods(['GET', 'POST'])
def payment_response(request):
status=request.GET.get('status', None)
tx_ref=request.GET.get('tx_ref', None)
print(status)
print(tx_ref)
return HttpResponse('Finished')
Anticipating your prompt answers. Thanks

When i want to insert a new data into cartpaket table, i haved this error "Cannot assign "7": "CartPaket.toko_id" must be a "Toko" instance"

This is my Toko Table
class Toko(models.Model):
nama_toko = models.CharField(max_length=30)
username = models.CharField(max_length=30)
image_banner = models.ImageField(upload_to='toko')
lokasi = models.CharField(max_length=30)
deskripsi = models.CharField(max_length=30)
status = models.CharField(max_length=30)
boolean= models.BooleanField(default=0)
def __str__(self):
return self.username
This is my Product Table
class Produk(models.Model):
nama_produk = models.CharField(max_length=30)
gambar = models.ImageField(upload_to='produk')
size = models.IntegerField(default=500)
deskripsi = models.CharField(max_length=200)
harga_resseler = models.IntegerField(default=0)
harga_agen = models.IntegerField(default=0)
harga_distributor = models.IntegerField(default=0)
harga_retail = models.IntegerField(default=0)
harga_hpp = models.IntegerField(default=0)
**This is my CartPaket **
class CartPaket(models.Model):
customer_name = models.CharField(max_length=30)
harga = models.IntegerField()
quantity = models.IntegerField(default=0)
total_berat = models.IntegerField(default=200)
subtotal = models.IntegerField(default=0)
total = models.IntegerField(default=0)
tanggal_pesan = models.DateTimeField(auto_now_add=True)
kota_customer_id = models.IntegerField(null=True)
kota_pelapak_id = models.IntegerField(null=True)
toko_id = models.ForeignKey(Toko, verbose_name='toko', on_delete=models.CASCADE, default=1)
produk_id = models.ForeignKey(Produk, verbose_name='produk', on_delete=models.CASCADE, default=1)
def __str__(self):
return self.customer_name
This is my views.py
if CartPaket.objects.filter(customer_name=get_user, produk_id=pro.id,
toko_id=get_toko.id).exists():
cart = CartPaket.objects.get(produk_id=pro.id, customer_name=get_user,
toko_id=get_toko.id)
cart.quantity += jumlah
cart.save()
else:
if jumlah != 0 or jumlah != '':
barang_distributor = Barang.objects.get(produk_id=pro.id, toko_id=get_toko.id)
cart = CartPaket(produk_id=pro.id, harga=barang_distributor.harga_jual,
toko_id=get_toko.id, customer_name=request.user.username,
quantity=jumlah, kota_customer_id=kota_customer_id,
kota_pelapak_id=kota_pelapak_id)
cart.total_berat = cart.quantity * cart.produk_id.size
cart.subtotal = cart.harga * cart.quantity
cart.save()
This is post request information
[1]: https://i.stack.imgur.com/OZhnU.png
This is the error i haved
[2]: https://i.stack.imgur.com/LYQja.png

Replace toko_id by toko_id__id. This way you are saying that the value after "=" is the id of the toko_id instance.
toko_id is an instance, like you defined in your models. Its id is toko_id.id

Django - Get objects which do NOT have any related objects

This may be a duplicate.
So I have:
class User(models.Model):
school = models.ForeignKey(School)
email = models.EmailField(max_length=254)
password = models.CharField(max_length=128)
firstname = models.CharField(max_length=50)
surname = models.CharField(max_length=50)
middlenames = models.CharField(max_length=100, blank=True)
utype = models.CharField(max_length=1, choices=(('a','Administrator'),('t','Staff'),('s','Student')))
lastlogin = models.DateTimeField(null=True)
active = models.BooleanField(default=True)
created = models.DateTimeField(auto_now_add=True)
class Staff(User):
# Some methods
class Student(User):
form = models.CharField(max_length=20)
parentemail = models.EmailField(max_length=254)
parentphone = models.CharField(max_length=20)
class Placement(models.Model):
student = models.ForeignKey(Student)
email = models.EmailField(max_length=254)
name = models.CharField(max_length=100)
company = models.CharField(max_length=100)
position = models.CharField(max_length=50)
house = models.CharField(max_length=50)
street = models.CharField(max_length=50)
town = models.CharField(max_length=50)
county = models.CharField(max_length=50)
postcode = models.CharField(max_length=8)
phone = models.CharField(max_length=20)
length = models.IntegerField(null=True)
category = models.CharField(max_length=50)
date = models.DateField(null=True)
state = models.CharField(max_length=1, choices=(('A','In progress'),('B','Confirmed'),('C','Completed')))
created = models.DateTimeField(auto_now_add=True)
class Visit(models.Model):
placement = models.ForeignKey(Placement)
staff = models.ForeignKey(Staff)
date = models.DateField(null=True)
feedback = models.CharField(max_length=1000)
confirmed = models.BooleanField(default=False)
created = models.DateTimeField(auto_now_add=True)
And I want to retrieve all Placements which do not have any Visits (and the Student belongs to a particular School).
My views
def placements(request):
if request.session['utype'] == 't':
context['user'] = Staff.objects.get(pk=request.session['user'])
if request.method == 'POST':
placements = context['placements'] = Placement.objects.filter(student__school=school)
for choice in visits:
placement = Placement.objects.get(pk=choice)
visit = placement.NewVisit(user, placement.date, '', False)
visit.save()
return redirect('workxp:visits')
else:
context['placements'] = Placement.objects.filter(student__school=school, visit_set=None)
return render(request, 'workxp/staff/placements.html', context)
This is what I have so far from looking at other questions, but it doesn't seem to work...
no_visits = Placement.objects.filter(student__school=school_object, visit_set=None)
If I give a related name to the placement field in Visit, it works. Why not visit_set?

You need to use visit_set to reference the reverse relation since it's one to many
no_visits = Placement.objects.filter(student__school=school_object, visit_set=None)
or if you were to specify a nice related name...
class Visit(models.Model):
placement = models.ForeignKey(Placement, related_name='visits')
...
no_visits = Placement.objects.filter(student__school=school_object, visits=None)