unable to use manytomanyfield

Using Django Using the ORM
1

hi all,
i’m trying using manytomanyfield in my model
models.py

class Doctor(models.Model):
    user=models.OneToOneField(User,on_delete=models.CASCADE)
    status=models.BooleanField(default=True)
class Patient(models.Model):
    user=models.OneToOneField(User,on_delete=models.CASCADE) 
    assignedDoctorId = models.ManyToManyField(Doctor,default=None)
    status=models.BooleanField(default=False)

form.py

class PatientForm(forms.ModelForm):
    assignedDoctorId = forms.ModelMultipleChoiceField(
                            queryset=models.Doctor.objects.all(),
                            widget=forms.CheckboxSelectMultiple
                            )
    class Meta:
        model=models.Patient
        }

when I click on buttons and submit the form the code return to me
hospital.Doctor.None while I check the checkboxes.
I cannot undestand why.
secondly I would like return the list of patient.assignedDoctorId_id
but I don’t know how.
many thanks

2

Please post the complete form and view where you are processing this form.

3

views.py

@login_required(login_url='adminlogin')
@user_passes_test(is_admin_or_doctor)
def update_patient_data_view(request,pk):
    patient=models.Patient.objects.get(id=pk)
    user=models.User.objects.get(id=patient.user_id)
    doctor = [{'id': i.id, 'doctor':i.get_name} for i in models.Doctor.objects.all()]
    patientExtraData = {'password':patient.get_patient_password,'assignedDoctorId':patient.get_doctor_id}

    userForm=forms.PatientUserForm(instance=user)
    patientForm=forms.PatientForm(instance=patient)

    mydict={'userForm':userForm,'patientForm':patientForm,'doctor':doctor,'patientExtraData':patientExtraData,'patientID':pk}
    if request.method=='POST':
        userForm=forms.PatientUserForm(request.POST,instance=user)
        patientForm=forms.PatientForm(request.POST,instance=patient)
        if userForm.is_valid() and patientForm.is_valid():
            user=userForm.save()
            user.set_password(user.password)
            user.save()
            patient=patientForm.save(commit=False)
            patient.status=True
            print(patient.assignedDoctorId)
            patient.save()
            mydictReturn={'userForm':userForm,'patientForm':patientForm,'patientID':pk}
            return render(request,'hospital/admin2patient/admin_update_patient.html',context=mydictReturn)
        else:
            print(userForm.errors, patientForm.errors)
    return render(request,'hospital/admin2patient/admin_update_patient_data.html',context=mydict)

while forms.py

class PatientUserForm(forms.ModelForm):
    class Meta:
        model=User
        fields=['first_name','last_name','username','password']
        widgets = {
        'password': forms.PasswordInput()
        }

    
class PatientForm(forms.ModelForm):
    assignedDoctorId = forms.ModelMultipleChoiceField(
                            queryset=models.Doctor.objects.all(),
                            widget=forms.CheckboxSelectMultiple
                            )
    class Meta:
        model=models.Patient
        fields=['assignedDoctorId']

in html file instead

<div class="form-group">
                {% render_field patientForm.assignedDoctorId class="form-control" placeholder="dottore" %}
              </div>
4

See the section on saving many-to-many relationships in ModelForms when using commit=False at Creating forms from models | Django documentation | Django