Add celery prefix for configuration (#1676)

* Add celery prefix for configuration

* Update CONTRIBUTORS.rst

CONTRIBUTORS.rst

@@ -87,6 +87,7 @@ Listed in alphabetical order.
   David Díaz               `@ddiazpinto`_                @DavidDiazPinto
   Davur Clementsen         `@dsclementsen`_              @davur
   Delio Castillo           `@jangeador`_                 @jangeador
+  Denis Orehovsky          `@apirobot`_
   Dónal Adams              `@epileptic-fish`_
   Dong Huynh               `@trungdong`_
   Emanuel Calso            `@bloodpet`_                  @bloodpet
@@ -172,6 +173,7 @@ Listed in alphabetical order.
 .. _@amjith: https://github.com/amjith
 .. _@andor-pierdelacabeza: https://github.com/andor-pierdelacabeza
 .. _@antoniablair: https://github.com/antoniablair
+.. _@apirobot: https://github.com/apirobot
 .. _@archinal: https://github.com/archinal
 .. _@areski: https://github.com/areski
 .. _@arruda: https://github.com/arruda

{{cookiecutter.project_slug}}/{{cookiecutter.project_slug}}/taskapp/celery.py

@@ -20,7 +20,9 @@ class CeleryAppConfig(AppConfig):
     def ready(self):
         # Using a string here means the worker will not have to
         # pickle the object when using Windows.
-        app.config_from_object('django.conf:settings')
+        # - namespace='CELERY' means all celery-related configuration keys
+        #   should have a `CELERY_` prefix.
+        app.config_from_object('django.conf:settings', namespace='CELERY')
         installed_apps = [app_config.name for app_config in apps.get_app_configs()]
         app.autodiscover_tasks(lambda: installed_apps, force=True)