在django-heroku部署上，postgres数据库获取错误:DATABASES配置不正确.请提供NAME值

Question

嗨，我是Heroku的新手，正在尝试在网站上部署我的django应用程序。我遇到的问题在标题中。连接到我的postgres数据库似乎有问题。在我的本地环境中，数据库运行得非常好——这个问题似乎只是在部署heroku时出现的。我已经在Heroku上添加了DATABASE_URL作为配置变量。该应用程序部署，但只是说内部服务器错误，以下是heroku给我的错误日志：

raise ImproperlyConfigured(
2020-12-14T23:41:58.543920+00:00 app[web.1]: django.core.exceptions.ImproperlyConfigured: settings.DATABASES is improperly configured. Please supply the NAME value.
2020-12-14T23:41:58.544131+00:00 app[web.1]: 10.148.121.8 - - [14/Dec/2020:23:41:58 +0000] "GET / HTTP/1.1" 500 0 "-" "-"
2020-12-14T23:41:58.545021+00:00 heroku[router]: at=info method=GET path="/" host=premtablelive.herokuapp.com request_id=aa3e9556-0490-4690-8b0b-d414e69a0305 fwd="24.190.19.51" dyno=web.1 connect=1ms service=5ms status=500 bytes=244 protocol=https

我不确定是什么原因导致了这个问题——我的代码中没有拼错数据库的名称值，因为它在我的本地环境中工作。

这是我的设置：

from pathlib import Path
import django_heroku 
import os

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

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

ALLOWED_HOSTS = ['premtablelive.herokuapp.com','127.0.0.1']

# Application definition
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'table',
'django_filters'
]
MIDDLEWARE = [
'django.middleware.security.SecurityMiddleware',
'whitenoise.middleware.WhiteNoiseMiddleware',
'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 = 'PremTable.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 = 'PremTable.wsgi.application'

# Database
# https://docs.djangoproject.com/en/3.1/ref/settings/#databases
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'premtable',
'USER': 'xxxxx',
'PASSWORD':'xxxxxx',
'HOST': 'database-1.casge6lscm2l.us-east-2.rds.amazonaws.com',
'PORT':'5432',
}
}
import dj_database_url
db_from_env = dj_database_url.config(conn_max_age = 600)
DATABASES['default'].update(db_from_env)

# 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 = 'UTC'
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_ROOT = os.path.join(BASE_DIR, 'staticfiles')
STATIC_URL = '/static/'
MEDIA_URL = '/images/'
STATICFILES_DIRS = [
os.path.join(BASE_DIR, "static"),
]
MEDIA_ROOT = os.path.join(BASE_DIR, 'static/images')

django_heroku.settings(locals())

这是我的Procfile

web: gunicorn PremTable.wsgi --log-file -

这是我的要求

asgiref==3.3.1
boto3==1.16.35
botocore==1.19.35
dj-database-url==0.5.0
Django==3.1.3
django-filter==2.4.0
django-heroku==0.3.1
django-storages==1.10.1
freeze==3.0
gunicorn==20.0.4
jmespath==0.10.0
Pillow==8.0.1
psycopg2==2.8.6
psycopg2-binary==2.8.6
python-dateutil==2.8.1
pytz==2020.4
s3transfer==0.3.3
six==1.15.0
sqlparse==0.4.1
unicorn==1.0.2
urllib3==1.26.2
whitenoise==5.2.0

如有任何帮助，我们将不胜感激！我真的没能在任何地方找到这个问题的解决方案

Answer 1

尝试使用此方法，这样，您将自动将数据库URL配置为heroku 提供的URL

from dj_database_url import parse as dburl 
from decouple import config
default_dburl = "sqlite:///" + os.path.join(BASE_DIR, "db.sqlite3")

DATABASES = {"default": config("DATABASE_URL", default=default_dburl, cast=dburl)}