Why django admin is not reading the __str_

I'm trying to add a str method in my models.py file to my administrative page show me the objects I've register with their own name and not like a 'UserObject(1)'

But when I add this method that's what is happening:

AttributeError at /admin/crud_app/user/ 'User' object has no attribute 'first_name'

models.py ->

from django.db import models


class User(models.Model):
    """
    A normal class that represents an User object, the attributes are those bellow:
    """
    first_name = models.CharField(name="First Name", max_length=30)
    last_name = models.CharField(name="Last Name", max_length=30)
    cpf = models.CharField(name="CPF", max_length=30)
    age = models.IntegerField(name="Age")
    email = models.EmailField(name="email", max_length=30)

    def __str__(self):
        return self.first_name

admin.py ->

from django.contrib import admin
from .models import User

admin.site.register(User)

I try to add the str method and I'm was expecting to recive the name that I give to my object registered instead of 'Name object(1)'

CodePudding user response：

You should define it in f-strings to take care of None values so that if it is None so it will not raise error.

class User(models.Model):
    """
    A normal class that represents an User object, the attributes are those bellow:
    """
    first_name = models.CharField(name="First Name", max_length=30)
    last_name = models.CharField(name="Last Name", max_length=30)
    cpf = models.CharField(name="CPF", max_length=30)
    age = models.IntegerField(name="Age")
    email = models.EmailField(name="email", max_length=30)

    def __str__(self):
        return f"{self.first_name}"

Also hard refresh through ctrl f5 and restart server in another port using python manage.py runserver 5000.

CodePudding user response：

Make sure there is no extra spaces before "def", after model fields.
Use f-strings if normal self.first_name is not working. e.g f"{self.first_name}"

By the way, it is working perfectly for me on all of my project. Which django version you are using?