How can I push Django code using dj-database-url, psycopg2 to Heroku?

Question

I am currently building a web project in Django and working on getting the site ready for deployment. I initially deployed the site on Heroku using Sqlite3, with my database code in settings as follows:

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

However, due to Heroku's ephemeral file system I realized I needed to switch to Postgres. After following a few different guides I arrived at the following changes to my settings. I first deleted the "DATABASES" as mentioned above and replaced it with the following:

import dj_database_url, psycopg2

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': *************,                      
        'USER': **************,
        'PASSWORD': ************************************,
        'HOST': *********************,
        'PORT': '5432',
    }
}

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

When I make these changes everything works perfectly on the local Django development server (127.0.0.1:8000), but once I push the changes through Git and to Heroku I try opening my site on Heroku and get "Application Error" and a suggestion to check my logs. Which report "ModuleNotFoundError: No module named dj_database_url" and similarly any outside library I try to upload to Heroku appears to have this issue. How can I fix this issue and move my site into production? Any help would be greatly appreciated.

Answer 1

您需要将它们包含在您的requirements.txt文件中，或者您使用的 buildpack 需要指明应用程序依赖项。