herokuでDjangoの作成が失敗する

Question

私は、DokuSuite（1.10.6）をHerokuに、ランタイムPython 3.6.1に展開しようとしています。アプリは、（テーブルが作成されていないという事実を除いて）正常に動作しますが、私は次のエラーを取得するmakemigrations実行しようとしたとき：

Running python manage.py makemigrations on prochu1991... up, run.2221 (Free) 
Traceback (most recent call last): 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/lib/utils.py", 
line 667, in open_for_read 
    return open_for_read_by_name(name,mode) 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/lib/utils.py", 
line 611, in open_for_read_by_name 
    return open(name,mode) 
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Windows\\Fonts\\Ver 
dana.ttf' 

During handling of the above exception, another exception occurred: 

Traceback (most recent call last): 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/lib/utils.py", 
line 670, in open_for_read 
    return getBytesIO(datareader(name) if name[:5].lower()=='data:' else urlopen 
(name).read()) 
    File "/app/.heroku/python/lib/python3.6/urllib/request.py", line 223, in urlop 
en 
    return opener.open(url, data, timeout) 
    File "/app/.heroku/python/lib/python3.6/urllib/request.py", line 526, in open 
    response = self._open(req, data) 
    File "/app/.heroku/python/lib/python3.6/urllib/request.py", line 549, in _open 

    'unknown_open', req) 
    File "/app/.heroku/python/lib/python3.6/urllib/request.py", line 504, in _call 
_chain 
    result = func(*args) 
    File "/app/.heroku/python/lib/python3.6/urllib/request.py", line 1388, in unkn 
own_open 
    raise URLError('unknown url type: %s' % type) 
urllib.error.URLError: <urlopen error unknown url type: c> 

During handling of the above exception, another exception occurred: 

Traceback (most recent call last): 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/pdfbase/ttfont 
s.py", line 137, in TTFOpenFile 
    f = open_for_read(fn,'rb') 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/lib/utils.py", 
line 672, in open_for_read 
    raise IOError('Cannot open resource "%s"' % name) 
OSError: Cannot open resource "C:\Windows\Fonts\Verdana.ttf" 

During handling of the above exception, another exception occurred: 

Traceback (most recent call last): 
    File "manage.py", line 22, in <module> 
    execute_from_command_line(sys.argv) 
    File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/_ 
_init__.py", line 367, in execute_from_command_line 
    utility.execute() 
    File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/_ 
_init__.py", line 316, in execute 
    settings.INSTALLED_APPS 
    File "/app/.heroku/python/lib/python3.6/site-packages/django/conf/__init__.py" 
, line 53, in __getattr__ 
    self._setup(name) 
    File "/app/.heroku/python/lib/python3.6/site-packages/django/conf/__init__.py" 
, line 41, in _setup 
    self._wrapped = Settings(settings_module) 
    File "/app/.heroku/python/lib/python3.6/site-packages/django/conf/__init__.py" 
, line 97, in __init__ 
    mod = importlib.import_module(self.SETTINGS_MODULE) 
    File "/app/.heroku/python/lib/python3.6/importlib/__init__.py", line 126, in i 
mport_module 
    return _bootstrap._gcd_import(name[level:], package, level) 
    File "<frozen importlib._bootstrap>", line 978, in _gcd_import 
    File "<frozen importlib._bootstrap>", line 961, in _find_and_load 
    File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked 
    File "<frozen importlib._bootstrap>", line 655, in _load_unlocked 
    File "<frozen importlib._bootstrap_external>", line 678, in exec_module 
    File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed 
    File "/app/Gry/settings.py", line 19, in <module> 
    pdfmetrics.registerFont(TTFont('Verdana', 'C:\Windows\Fonts\Verdana.ttf', 'U 
TF-8')) 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/pdfbase/ttfont 
s.py", line 1147, in __init__ 
    self.face = TTFontFace(filename, validate=validate, subfontIndex=subfontInde 
x) 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/pdfbase/ttfont 
s.py", line 1042, in __init__ 
    TTFontFile.__init__(self, filename, validate=validate, subfontIndex=subfontI 
ndex) 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/pdfbase/ttfont 
s.py", line 412, in __init__ 
    TTFontParser.__init__(self, file, validate=validate,subfontIndex=subfontInde 
x) 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/pdfbase/ttfont 
s.py", line 161, in __init__ 
    self.readFile(file) 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/pdfbase/ttfont 
s.py", line 239, in readFile 
    self.filename, f = TTFOpenFile(f) 
    File "/app/.heroku/python/lib/python3.6/site-packages/reportlab/pdfbase/ttfont 
s.py", line 147, in TTFOpenFile 
    raise TTFError('Can\'t open file "%s"' % fn) 
reportlab.pdfbase.ttfonts.TTFError: Can't open file "C:\Windows\Fonts\Verdana.ttf" 

settings.py

import os 
from reportlab.pdfbase import pdfmetrics 
from reportlab.pdfbase.ttfonts import TTFont 
from reportlab.lib.fonts import addMapping 

#PDF Settings 
pdfmetrics.registerFont(TTFont('Verdana', 'C:\Windows\Fonts\Verdana.ttf', 'UTF-8')) 
addMapping('Verdana',0,0,'Verdana') 
# 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/1.10/howto/deployment/checklist/ 

# SECURITY WARNING: keep the secret key used in production secret! 
SECRET_KEY = '+hi1^3uy-5p=h!pq9-(og2$hu$ojw(&97d%71%cnkjeky*4&)#' 

# 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', 
    'main' 
] 

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 = 'Gry.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 = 'Gry.wsgi.application' 


# Database 
# https://docs.djangoproject.com/en/1.10/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/1.10/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/1.10/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/1.10/howto/static-files/ 

LOGIN_URL = 'login' 
LOGOUT_URL = 'logout' 
LOGIN_REDIRECT_URL = 'home' 

import dj_database_url 
db_from_env = dj_database_url.config(conn_max_age=500) 
DATABASES['default'].update(db_from_env) 

STATIC_URL = '/static/' 
STATICFILES_DIRS = [ 
os.path.join(BASE_DIR, "static"), 
] 
STATIC_ROOT = os.path.join(BASE_DIR, "staticfiles") 
STATICFILES_STORAGE = 'whitenoise.django.GzipManifestStaticFilesStorage' 

を私はsqliteのを使用しています。

Answer 1

さて、ローカルのWindowsマシン上の場所にttfファイルへのパスをハードコーディングしました。明らかに、それはHerokuで動作するつもりはありません。ファイルがレポート内にあることを確認し、相対パスを使用する必要があります。

また、Herokuではsqliteを使用できません。幸いなことに、dj_database_urlを使用しているため、DATABASES設定はオーバーライドされます。