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TL;DR#

default User를 의존하는 코드 - forms.py - 커스텀 폼의 Meta를 만들어 내가 넣고 싶은 필드만 fields에 넣는다. 이건 쉽지. - admin.py - django.contrib.auth.UserAdmin 소스코드를 잘 읽어보면 form, add_form이라는 멤버가 있 다. 디폴트로 각각 UserChangeForm과 UserCreationForm을 composite 패턴 형태로 가지고 있는데, 여기에서 내가 오버라이딩한 username을 참조하는 것이었다. 따라서 이 멤버들을 오버라이드 하여야 한다.

Question#

UserCreationForm requires username field. But I already override username with email. How can I resolve this error? Error message:

Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "/home/linuxbrew/.linuxbrew/opt/python@3.11/lib/python3.11/threading.py", line 1038, in _bootstrap_inner
    self.run()
  File "/home/linuxbrew/.linuxbrew/opt/python@3.11/lib/python3.11/threading.py", line 975, in run
    self._target(*self._args, **self._kwargs)
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/utils/autoreload.py", line 64, in wrapper
    fn(*args, **kwargs)
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/core/management/commands/runserver.py", line 125, in inner_run
    autoreload.raise_last_exception()
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/utils/autoreload.py", line 87, in raise_last_exception
    raise _exception[1]
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/core/management/__init__.py", line 394, in execute
    autoreload.check_errors(django.setup)()
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/utils/autoreload.py", line 64, in wrapper
    fn(*args, **kwargs)
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/apps/registry.py", line 124, in populate
    app_config.ready()
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/contrib/admin/apps.py", line 27, in ready
    self.module.autodiscover()
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/contrib/admin/__init__.py", line 50, in autodiscover
    autodiscover_modules("admin", register_to=site)
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/utils/module_loading.py", line 58, in autodiscover_modules
    import_module("%s.%s" % (app_config.name, module_to_search))
  File "/home/linuxbrew/.linuxbrew/opt/python@3.11/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1206, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1178, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1149, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 940, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/home/chltm/workspace/bookstore/users/admin.py", line 5, in <module>
    from .forms import SignupForm
  File "/home/chltm/workspace/bookstore/users/forms.py", line 6, in <module>
    class CustomUserCreationForm(UserCreationForm):
  File "/home/chltm/workspace/bookstore/venv/lib/python3.11/site-packages/django/forms/models.py", line 321, in __new__
    raise FieldError(message)
django.core.exceptions.FieldError: Unknown field(s) (username) specified for User

Answer#

To resolve the error, you need to update the UserCreationForm to use the email field instead of the username field. Follow these steps:

  1. Create a custom form, CustomUserCreationForm, that inherits from UserCreationForm.
from django.contrib.auth.forms import UserCreationForm
from .models import User

class CustomUserCreationForm(UserCreationForm):
    class Meta(UserCreationForm.Meta):
        model = User
        fields = ('email',)
  1. In your admin.py file, import and use the CustomUserCreationForm in the add_form field of the UserAdmin class.
from django.contrib import admin
from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
from .models import User
from .forms import CustomUserCreationForm

class UserAdmin(BaseUserAdmin):
    add_form = CustomUserCreationForm

admin.site.register(User, UserAdmin)

By doing this, you're specifying the CustomUserCreationForm as the form to be used when adding a user in the Django admin. This form only includes the email field, allowing you to create a user without the username field while still maintaining the uniqueness constraint on the username field.