Django - Name Error when views call model's method

Question

I am a newbie in Django. I have defined the models and a method

from django.db import models
from django.contrib.auth.models import User

class Practice(models.Model):
    name = models.CharField(max_length=100)
    description = models.CharField(max_length=200)
    phone = models.IntegerField()

    def __str__(self):
        return self.name

class Doctor(models.Model):
    specialisation = models.CharField(max_length=50)
    practice = models.ForeignKey(Practice, related_name='doctor',on_delete=models.DO_NOTHING)
    name = models.ForeignKey(User, related_name ='doctor', on_delete=models.DO_NOTHING)
    selected = models.BooleanField()


    def __str__(self):
        return self.specialisation

    def get_list_doctors(self):
        all_doctors = User.objects.exclude(pk=1).filter(doctor__isnull=False)
        all_doctors_names = all_doctors.values_list('last_name', 'first_name')
        return all_doctors_names

class Patient(models.Model):
    name = models.ForeignKey(User, related_name='patient', on_delete=models.DO_NOTHING)
    height = models.DecimalField(max_digits=6, decimal_places=2)
    weight = models.DecimalField(max_digits=6, decimal_places=2)
    practice = models.ForeignKey(Practice, related_name='patient',on_delete=models.DO_NOTHING)
    primary_doctor = models.ForeignKey(Doctor, related_name='patient',on_delete=models.DO_NOTHING)


class Appointment(models.Model):
    start_time = models.DateTimeField()
    end_time = models.DateTimeField()
    doctor = models.ForeignKey(Doctor, related_name='appointment',on_delete=models.DO_NOTHING)
    practice = models.ForeignKey(Practice, related_name='appointment',on_delete=models.DO_NOTHING)
    patient = models.ForeignKey(Patient, related_name='appointment',on_delete=models.DO_NOTHING)

This is my view

def login_user(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)

        if user is not None:
            login(request, user)
            messages.success(request, ('You Have Been Logged In!'))

            doctor_list = get_list_doctors()
            context = { 'doctor_name': doctor_list}
            return render(request, 'homeunimed.html', context)

I am trying to use the method in the view. The reason for defining it in the model is so that I can reuse.

NameError at /
name 'get_list_doctors' is not defined
Request Method: POST
Request URL:    http://localhost:8000/
Django Version: 2.1
Exception Type: NameError
Exception Value:    
name 'get_list_doctors' is not defined
Exception Location: /Users/vinoojacob/Django/my_app/authenticate/views.py in login_user, line 27
Python Executable:  /Users/vinoojacob/Django/bin/python
Python Version: 3.6.5
Python Path:    
['/Users/vinoojacob/Django/my_app',
 '/Users/vinoojacob/Django/lib/python36.zip',
 '/Users/vinoojacob/Django/lib/python3.6',
 '/Users/vinoojacob/Django/lib/python3.6/lib-dynload',
 '/Users/Shared/anaconda3/lib/python3.6',
 '/Users/vinoojacob/Django/lib/python3.6/site-packages']

However, I get this error. Any pointers to what is wrong. I thought you could access any methods defined in the model as long as the model is imported. Thanks for your help.

Answer 1

As you wrote you can access it via model. So decorate your method with @staticmethod, leave out self as argument and call it this way doctor_list = Doctor.get_list_doctors().

@staticmethod
def get_list_doctors():
    all_doctors = User.objects.exclude(pk=1).filter(doctor__isnull=False)
    all_doctors_names = all_doctors.values_list('last_name', 'first_name')
    return all_doctors_names