Django: TypeError: 'ModelSignal' object is not callable

Question

我有一段代码抛出错误： TypeError: 'ModelSignal' object is not callable.

当我要在我的项目中添加信号时，出现了这个错误。为什么会出现这种类型的错误？你需要知道什么才能回答我？

请帮助我的人。我是 Django 的新手。提前致谢。

这是我的 views.py 文件：

def registerPage(request):
    form = CreateUserForm()
    if request.method == "POST":
        form = CreateUserForm(request.POST)
        if form.is_valid():
            user =form.save()
            username = form.cleaned_data.get('username')
            messages.success(request, 'Account successfully created for ' + username)

            return redirect ('login')

    context = {'form': form}
    return render(request, 'accounts/register.html', context)

我的 models.py 文件：

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

class Student(models.Model):
    user = models.OneToOneField(User, null=True, blank=True, on_delete=models.CASCADE)
    name = models.CharField(max_length=200)
    phone = models.CharField(max_length=200, null=True)
    email = models.CharField(max_length=200, null=True)
    profile_pic = models.ImageField(default= 'default-picture.jpg', null= True, blank= True)
    date_created = models.DateTimeField(auto_now_add=True, null=True)

    def __str__(self):
        return str(self.name)

我的 signals.py 文件：

from django.db.models.signals import post_save
from django.contrib.auth.models import Group, User
from .models import Student

def student_profile(sender, instance, created, **kwargs):
    if created:
        group = Group.objects.get(name = 'Student')
        instance.groups.add(group)
        Student.objects.create(
            user = instance,
            name = instance.username
        )
post_save(student_profile, sender= User)

我的 apps.py 文件：

from django.apps import AppConfig


class AccountsConfig(AppConfig):
    name = 'accounts'

    def ready(self):
        import accounts.signals

还有我的 settings.py 文件：

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/3.1/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '1dcgsc@63lw_%+90xqra@z=&(q!8sdxf*dg7k6=ptxi&k8o*'

# 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',
    
    'accounts.apps.AccountsConfig',
    'django_filters',
]

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',
]

ROOT_URLCONF = 'cmp.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        '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 = 'cmp.wsgi.application'


# Database
# https://docs.djangoproject.com/en/3.1/ref/settings/#databases

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


# Password validation
# https://docs.djangoproject.com/en/3.1/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/3.1/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'Asia/Dhaka'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.1/howto/static-files/

STATIC_URL = '/static/'
MEDIA_URL = '/images/'

STATICFILES_DIRS = [
    os.path.join(BASE_DIR, 'static')
]

MEDIA_ROOT = os.path.join(BASE_DIR, 'static/images')

Answer 1

您正在调用不可调用的 post_save 对象。试试 post_save.connect().

from django.db.models.signals import post_save
from django.contrib.auth.models import Group, User
from .models import Student

def student_profile(sender, instance, created, **kwargs):
    if created:
        group = Group.objects.get(name = 'Student')
        instance.groups.add(group)
        Student.objects.create(
            user = instance,
            name = instance.username
        )
post_save.connect(student_profile, sender= User)

或者您也可以尝试使用 receiver 装饰器：

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

@receiver(post_save, sender=User)
def student_profile(sender, instance, created, **kwargs):
    if created:
        group = Group.objects.get(name = 'Student')
        instance.groups.add(group)
        Student.objects.create(
            user = instance,
            name = instance.username
        ).save()

Django: TypeError: 'ModelSignal' object is not callable

Django: TypeError: 'ModelSignal' object is not callable

django

django-signals

typeerror