How can I call a classmethod from another class in python?

Question

I'm programming an app for the edXproyect using Django and I need to retrieve some information from auth_user table and I don't know how to do it. I have this:

models.py

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


class Recomendacion(models.Model):

    usuario = models.ForeignKey(User, db_column='username', primary_key=True)
    recurso = models.CharField(max_length=255, db_column='next_module')

    def __str__(self):
        return u'%s' % (self.usuario.username)

admin.py

from django.contrib import admin
from recomendador.models import Recomendacion

class RecomendacionAdmin(admin.ModelAdmin):

    fields = ['usuario', 'recurso']
    list_display = ['usuario', 'recurso']

admin.site.register(Recomendacion, RecomendacionAdmin)

But I would like to display something like:

list_display = ['id', 'usuario', 'full_name', 'recurso']

So I have to retrieve the id and full_name from the auth_table with the username field. I have tried adding classmethods in Recomendador like:

def get_id(self):
    return self.usuario.id

and now I want to call them from the RecomendacionAdmin class so I can list the id and full_name fields too but I don't know how to do it. I have googled it but I only get exceptions and errors with the solutions I find. Can anyone help me with this? I'm new to python...

Answer 1

Having a bit of trouble being 100% sure what you are looking for due to the source code not being English, but if you are looking to obtain data about Recomendacion inside of admin.py , since you are already importing Recomendacion , you should just be able to do the following:

recomendacion = Recomendacion.objects.get(username=desired_username)

That will give you the object who's username is whatever you are looking for, and then you can just access the id and full_name fields.