Django中使用django-allauth创建用户时，post_save信号的created参数始终为False且CLI创建用户时信号不触发的问题

我的信号定义 #

from django.dispatch import receiver
from django.contrib.auth.models import User
from django.db.models.signals import post_save, pre_save

@receiver(post_save, sender=User)
def create_profile(sender, instance, created, **kwargs): 
    user = instance
    if created: 
        print('A new user is created')
    else: 
        print('A new user is not created')
    
    print(sender, user, created)

信号注册方式 #

我在a_users.apps.py中注册信号，代码如下：

def ready(self): 
    print('Ready method is executing')
    import a_users.signals

项目settings.py配置 #

"""
Django settings for a_core project.

Generated by 'django-admin startproject' using Django 5.1.3.

For more information on this file, see
https://docs.djangoproject.com/en/5.1/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/5.1/ref/settings/
"""

from pathlib import Path
import os

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/5.1/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'django-insecure-ip6_#ne%exiu=@9a0rbb(_b%9b*oxe+ejyyfm0lmd4+f@v#r()'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = ["*"]


# Application definition
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'a_posts',
    # 'django.contrib.sites',
    'allauth',
    'allauth.account',
    'a_users',
    'django_cleanup.apps.CleanupConfig'
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'allauth.account.middleware.AccountMiddleware',
]

AUTHENTICATION_BACKENDS = [
    # Needed to login by username in Django admin, regardless of `allauth`
    'django.contrib.auth.backends.ModelBackend',

    # `allauth` specific authentication methods, such as login by email
    'allauth.account.auth_backends.AuthenticationBackend',
]

ROOT_URLCONF = 'a_core.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [BASE_DIR / 'templates'],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'a_core.wsgi.application'


# Database
# https://docs.djangoproject.com/en/5.1/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'db.sqlite3',
    }
}


# Password validation
# https://docs.djangoproject.com/en/5.1/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/5.1/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/5.1/howto/static-files/

STATICFILES_DIRS = [
    os.path.join(BASE_DIR, 'static'),
]
STATIC_URL = 'static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')

# Media file configuration (User uploaded images or files)
MEDIA_URL = 'media/'
MEDIA_ROOT = os.path.join(BASE_DIR, 'media') # Where the media files to be stored


# Default primary key field type
# https://docs.djangoproject.com/en/5.1/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'


# Allauth Configuration
LOGIN_REDIRECT_URL = '/posts/'
EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
ACCOUNT_AUTHENTICATION_METHOD = 'email'
ACCOUNT_EMAIL_REQUIRED = True 

ACCOUNT_USERNAME_BLACKLIST = [
    'admin', 'student', 'profile', 
    'category', 'posts','accounts',
    'edit', 'delete',
]

遇到的问题 #

我原本期望在创建新用户时，create_profile函数中的created参数会返回True，但实际每次都是False，我搞不懂为什么会这样。

为了排查问题，我给Profile模型也写了一个post_save信号测试，结果完全正常，符合预期：

@receiver(post_save, sender=Profile)
def profile_created(sender, instance, created, **kwargs): 
    if created: 
        print("A new profile is created")
    else: 
        print("A new profile is not created")
        print("A new profile is updated")

    print(sender, instance, created)

还有个奇怪的现象：当我通过CLI创建用户时，这个User的post_save信号根本不会触发。

提前感谢大家的帮助！

备注：内容来源于stack exchange，提问作者big_0