Why doesn't this Django logging work? - django

Question

I'm having trouble getting going with Django logging. I've read both the Python and Django documentation on logging but I still don't see what I'm doing wrong. To start, I'm just trying to log a message to the console where my Django development server is running when I execute this simple view:
# demo/views.py
import logging
logger = logging.getLogger(__name__)
def demo_logging(request, template):
logger.error("Got some error")
return render(request, template)
I'm using Django's default logging setting as specified in django/utils/log.py in my settings file so that I (hopefully) know exactly what's happening (which, clearly I don't):
# settings.py
DEBUG = True
...
LOGGING_CONFIG = None
LOGGING = {
'version': 1,
'disable_existing_loggers': False,
'filters': {
'require_debug_false': {
'()': 'django.utils.log.RequireDebugFalse',
},
'require_debug_true': {
'()': 'django.utils.log.RequireDebugTrue',
},
},
'handlers': {
'console': {
'level': 'INFO',
'filters': ['require_debug_true'],
'class': 'logging.StreamHandler',
},
'null': {
'class': 'logging.NullHandler',
},
'mail_admins': {
'level': 'ERROR',
'filters': ['require_debug_false'],
'class': 'django.utils.log.AdminEmailHandler'
}
},
'loggers': {
'django': {
'handlers': ['console'],
},
'django.request': {
'handlers': ['mail_admins'],
'level': 'ERROR',
'propagate': False,
},
'django.security': {
'handlers': ['mail_admins'],
'level': 'ERROR',
'propagate': False,
},
'py.warnings': {
'handlers': ['console'],
},
}
}
import logging.config
logging.config.dictConfig(LOGGING)
When I execute the view, I don't see anything in the console except the message,
No handlers could be found for logger "demo.views"
I don't understand what I'm doing wrong. I would think calling logger.error would hit the django logger which is linked to the console handler which is defined.
Thanks.
FOLLOW UP
I solved this problem by adding a default, "catch-all" logger that would be triggered when creating a logger using the "__name__" argument:
'loggers': {
'': {
'handlers': ['console'],
},
...

Answer 1

Calling logger = logging.getLogger(__name__) causes the logging module to search for a logger named as your module (demo.views); as you have no logger defined by that name, it fails. To simply log to console, you can use the django logger defined in 'loggers' key of your LOGGING configuration:
import logging
logger = logging.getLogger('django')
def demo_logging(request, template):
logger.error("Got some error")
return render(request, template)