How to properly refactor your settings file in Django | Django Split Settings?

Question

Django

Hello, please help me understand.
Decided to refactor the settings file in my project with django-split-settings app . I am using the following structure:

project_name/settings/ <- директория в которой обычно Django по умолчанию создает файл settings.py
    __init__.py
    components
        __init__.py
        common.py
        secret_key.py
        database.py
    environments
        __init__.py
        development.py
        production.py

PS The following code does not throw an error when running the command python manage.py runserver. The error takes off when the user enters any of the pages of the project. The database parameters are correctly specified in the settings. What could be wrong?
__init__.py:

# -*- coding: utf-8 -*-

from split_settings.tools import include
from os import environ

ENVIRONMENT = 'development' or 'production'

base_settings = [
    'components/common.py',
    'components/secret_key.py',

    'environments/%s.py' % ENVIRONMENT,
]

include(*base_settings)

common.py:

# -*- coding: utf-8 -*-

import os
from django.core.urlresolvers import reverse_lazy


BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

ALLOWED_HOSTS = ['127.0.0.1']

DEFAULT_CHARSET = 'utf-8'

INSTALLED_APPS = [
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.forms',
    'django_select2',  # "django-select2" application
    'modeltranslation',  # "django-modeltranslation" application
    'reversion',  # django-reversion application
    'custom_app_1',  # "custom_app_1" application
    'custom_app_2',  # "custom_app_2" application
    'custom_app_3',  # "custom_app_3" application
    'el_pagination',  # django-el-pagination application
    'custom_app_4',  # 'custom_app_4' application
    'custom_app_4.templatetags'  # custom tags in 'custom_app_4' application
]

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 = 'CA.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.template.context_processors.tz',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'CA.wsgi.application'

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',
    },
]

LANGUAGE_CODE = 'ru'

LANGUAGES = (
    ('ru', 'Russian'),
    ('en', 'English'),
    ('kz', 'Kazakh'),
)

# START: Model Translation Settings
MODELTRANSLATION_LANGUAGES = ('ru', 'en', 'kz')

MODELTRANSLATION_DEFAULT_LANGUAGE = 'ru'
# END: Model Translation Settings

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

# START: Static and Media files settings
STATICFILES_DIRS = [os.path.join(BASE_DIR, 'static')]

STATIC_URL = '/static/'

STATIC_ROOT = os.path.join(BASE_DIR, 'static_root')

MEDIA_URL = '/media/'

MEDIA_ROOT = os.path.join(BASE_DIR, 'media_root')
# END: Static and Media files settings

secret_key.py:
SECRET_KEY = 'LONG_KEY'
database.py:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.oracle',
        'NAME': 'MY_NAME',
        'USER': 'MY_USER',
        'PASSWORD': 'MY_PASSWORD',
    }
}

development.py:

from split_settings.tools import include, optional

DEBUG = True

development_settings = [
    optional('components/database.py'),
    optional('components/logging.py'),
]

include(*development_settings)

ERROR:

Traceback (most recent call last):
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/core/handlers/exception.py", line 41, in inner
response = get_response(request)
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 22, in _wrapped_view
if test_func(request.user):
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 46, in <lambda>
lambda u: u.is_authenticated,
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/utils/functional.py", line 238, in inner
self._setup()
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/utils/functional.py", line 386, in _setup
self._wrapped = self._setupfunc()
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/contrib/auth/middleware.py", line 24, in <lambda>
request.user = SimpleLazyObject(lambda: get_user(request))
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/contrib/auth/middleware.py", line 12, in get_user
request._cached_user = auth.get_user(request)
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/contrib/auth/__init__.py", line 211, in get_user
user_id = _get_user_session_key(request)
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/contrib/auth/__init__.py", line 61, in _get_user_session_key
return get_user_model()._meta.pk.to_python(request.session[SESSION_KEY])
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/contrib/sessions/backends/base.py", line 57, in __getitem__
return self._session[key]
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/contrib/sessions/backends/base.py", line 207, in _get_session
self._session_cache = self.load()
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/contrib/sessions/backends/db.py", line 35, in load
expire_date__gt=timezone.now()
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/query.py", line 374, in get
num = len(clone)
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/query.py", line 232, in __len__
self._fetch_all()
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/query.py", line 1118, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/query.py", line 53, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch)
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 876, in execute_sql
sql, params = self.as_sql()
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 428, in as_sql
extra_select, order_by, group_by = self.pre_sql_setup()
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 46, in pre_sql_setup
self.setup_query()
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 37, in setup_query
self.select, self.klass_info,
self.annotation_col_map = self.get_select()
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 227, in get_select
sql, params = self.compile(col, select_format=True)
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 373, in compile
sql, params = node.as_sql(self, self.connection)
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/expressions.py", line 695, in as_sql
return "%s.%s" % (qn(self.alias), qn(self.target.column)), []
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 364, in quote_name_unless_alias
r = self.connection.ops.quote_name(name)
File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/backends/dummy/base.py", line 20, in complain
raise ImproperlyConfigured("settings.DATABASES is improperly configured. "
ImproperlyConfigured: settings.DATABASES is improperly configured. Please supply the ENGINE value. Check settings documentation for more details.