How to create a function inside a model class?

Using Django The Admin
1 
class Banco(models.Model):
    numero = PositiveSmallIntegerField(db_column='Numero', verbose_name='Número', primary_key=True)
    nome_razao_social = CharField(db_column='NomeRazaoSocial', verbose_name='Razão Social', max_length=100)
    url = models.CharField(db_column='URL', max_length=100, verbose_name='URL', blank=True, null=True)

    # Metadata
    class Meta:
        # managed = False
        db_table: str = 'tb_bancos'
        verbose_name: str = 'Banco'
        verbose_name_plural: str = 'Bancos'
        db_table_comment: str = 'Cadastro de bancos'
        ordering: list[str] = ['numero']

    def __str__(self) -> CharField:
        """ String para representar o objeto MyModelName (no site Admin)."""
        return self.nome_razao_social

    def __list_display__(self) -> tuple:
        return (self.numero,
                self.nome_razao_social,
                self.url)

    def __search_fields__(self) -> tuple:
        return (self.nome_razao_social,)

    def __list_filter__(self) -> tuple:
        return (self.nome_razao_social,)

How do I use the list_display, search_fields and list_filter functions in the code below?

from django.contrib import admin
from .models import (Banco)


tabelas_dominios_models: list = ['Banco']
for _ in tabelas_dominios_models:
    eval(_).__str__(eval(_))

    @admin.register(eval(_))
    class TabelaDominioAdmin(admin.ModelAdmin):
        list_display: tuple = eval(_).__list_display__(eval(_))
        search_fields: tuple = eval(_).__search_fields__(eval(_))
        list_filter: tuple = eval(_).__list_filter__(eval(_))

When I run the code I get the error below:

Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "C:\Users\PRSantos\AppData\Local\Programs\Python\Python312\Lib\threading.py", line 1075, in _bootstrap_inner
    self.run()
  File "C:\Users\PRSantos\AppData\Local\Programs\Python\Python312\Lib\threading.py", line 1012, in run
    self._target(*self._args, **self._kwargs)
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\utils\autoreload.py", line 64, in wrapper
    fn(*args, **kwargs)
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\core\management\commands\runserver.py", line 134, in inner_run
    self.check(**check_kwargs)
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\core\management\base.py", line 492, in check
    all_issues = checks.run_checks(
                 ^^^^^^^^^^^^^^^^^^
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\core\checks\registry.py", line 89, in run_checks
    new_errors = check(app_configs=app_configs, databases=databases)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\contrib\admin\checks.py", line 52, in check_admin_app
    errors.extend(site.check(app_configs))
                  ^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\contrib\admin\sites.py", line 90, in check
    errors.extend(modeladmin.check())
                  ^^^^^^^^^^^^^^^^^^
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\contrib\admin\options.py", line 151, in check
    return self.checks_class().check(self, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\contrib\admin\checks.py", line 810, in check
    *self._check_list_display(admin_obj),
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\contrib\admin\checks.py", line 899, in _check_list_display
    return list(
           ^^^^^
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\contrib\admin\checks.py", line 901, in <genexpr>
    self._check_list_display_item(obj, item, "list_display[%d]" % index)
  File "D:\Users\PRSantos\Desenvolvimentos\ProjetosPython\ProjetosPRSantos\pjtSisAdminWeb2025\.venvPjtSisAdminWeb2025\Lib\site-packages\django\contrib\admin\checks.py", line 909, in _check_list_display_item
    elif hasattr(obj, item):
         ^^^^^^^^^^^^^^^^^^
TypeError: attribute name must be string, not 'DeferredAttribute'
2

Why to use eval()?!

Try something like that in your models.py:

class Banco(models.Model):
    numero = models.PositiveSmallIntegerField(db_column='Numero', verbose_name='Número', primary_key=True)
    nome_razao_social = models.CharField(db_column='NomeRazaoSocial', verbose_name='Razão Social', max_length=100)
    url = models.CharField(db_column='URL', max_length=100, verbose_name='URL', blank=True, null=True)

And the in your admin.py:


@admin.register(Banco)
class BancoAdmin(admin.ModelAdmin):
    list_display = ('numero', 'nome_razao_social', 'url')
    search_fields = ('nome_razao_social',)
    list_filter = ('nome_razao_social',)
3

Good morning.

This list tends to be long. Because of this, I will use eval().

Ex.

from .models import (Banco,
                     Assunto,
                     Colaborador,
                     TipoArmazenamento,
                     TipoOperadora,
                     TipoPagamento,
                     TipoParceiro,
                     TipoPedido,
                     TipoPessoa,
                     TipoTelefone,
                     Unidade,
                     Usuario)

This way I intend to simplify the code.

tabelas_dominios_models: list = ['Banco',
                     'Assunto',
                     'Colaborador',
                     'TipoArmazenamento',
                     'TipoOperadora',
                     'TipoPagamento',
                     'TipoParceiro',
                     'TipoPedido',
                     'TipoPessoa',
                     'TipoTelefone',
                     'Unidade',
                     'Usuario']


for _ in tabelas_dominios_models:
    @admin.register(eval(_))
    class TabelaDominioAdmin(admin.ModelAdmin):
        list_display: tuple = eval(_).__list_display__(eval(_))
        search_fields: tuple = eval(_).__search_fields__(eval(_))
        list_filter: tuple = eval(_).__list_filter__(eval(_))

I would like to thank everyone in advance for their efforts to help.