无法定义默认缓存 Django

Question

我正在尝试在 Django 中设置缓存，但它不允许我定义默认缓存。我不太关心我使用的是什么类型的缓存（我已经尝试过 Filesystem and Database 缓存。）

但即使复制粘贴他们的示例代码，错误检查器也会告诉我：

?: (caches.E001) You must define a 'default' cache in your CACHES setting.

我还尝试将 CACHES 设置放在 settings.py 文件的底部，以确保初始化 CACHES 设置可能依赖的任何内容。

我的代码如下：

CACHES = {
   'default': {
      'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',
      'LOCATION': '/var/tmp/django_cache',
   }
}

完整的错误信息是：

Unhandled exception in thread started by <function check_errors.

<locals>.wrapper at 0x0436A300>
Traceback (most recent call last):
  File "C:\Users\Kasper\Documents\kasperfred-blog\kasperfred-blog\lib\site-packages\django\utils\autoreload.py", line 226, in wrapper
    fn(*args, **kwargs)
  File "C:\Users\Kasper\Documents\kasperfred-blog\kasperfred-blog\lib\site-packages\django\core\management\commands\runserver.py", line 116, in inner_run
    self.check(display_num_errors=True)
  File "C:\Users\Kasper\Documents\kasperfred-blog\kasperfred-blog\lib\site-packages\django\core\management\base.py", line 472, in check
    raise SystemCheckError(msg)
django.core.management.base.SystemCheckError: SystemCheckError: System check identified some issues:

ERRORS:
?: (caches.E001) You must define a 'default' cache in your CACHES setting.

大部分设置文件（编辑掉密钥）

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
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/1.9/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'Sorry'

# 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',

    'posts',

    # Third party
    'trumbowyg',
    'crispy_forms',
    'taggit',
    'imagefit',
]

CRISPY_TEMPLATE_PACK = 'bootstrap3'
TAGGIT_CASE_INSENSITIVE = True

# Image fit settings 
IMAGEFIT_ROOT = "public"
IMAGEFIT_PRESETS = {
    'card_small': {'width': 64, 'height': 64, 'crop': True},
    'my_preset1': {'width': 300, 'height': 220},
    'my_preset2': {'width': 100},
}

MIDDLEWARE_CLASSES = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'kasperfred_blog.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(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 = 'kasperfred_blog.wsgi.application'


# Database
# https://docs.djangoproject.com/en/1.9/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}

# Password validation
# https://docs.djangoproject.com/en/1.9/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/1.9/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/1.9/howto/static-files/

STATIC_URL = '/static/'
MEDIA_URL = "/media/"

STATICFILES_DIRS = [
    os.path.join(BASE_DIR, "static"),
    #'/var/www/static/',
]

STATIC_ROOT = os.path.join(os.path.dirname(BASE_DIR), "static_cdn")
MEDIA_ROOT = os.path.join(os.path.dirname(BASE_DIR), "media_cdn")

# Cache 
CACHES = {
    'default': {
      'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',
      'LOCATION': '/var/tmp/django_cache',
    }

}

Answer 1

此问题是由 imagefit 引起的，它会在加载时覆盖 CACHES 设置：

settings.CACHES = {
    IMAGEFIT_CACHE_BACKEND_NAME: {
        'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',
        'LOCATION': os.path.join(tempfile.gettempdir(), 'django_imagefit')
    }
}

显然问题出在 recently fixed - 所以如果您可以获得最新版本，它应该可以解决问题。

我无法从 Github 存储库判断进行此更改后 PyPi 上是否发布了新版本。

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