Django Logging & Exceptions

Django supports testing activities like logging, debugging, and exception handling. We can capture error logs at various severity levels in text format under a log file.

Django Logging

Django can capture and classify logs using the Python logging module. A log file has elements like Log_level: Logger_name: Message.

Logging configuration consists of four parts:

• Loggers: It is like an entry point of logging configuration. Loggers are named buckets in which messages can be written.
• There are levels of logging that define the severity of the message:
• DEBUG: It captures low-level and verbose system information for debugging purposes. Logging level DEBUG can also be applied with the value 10.
• INFO: It captures general system information. Logging level INFO can also be applied with a value 20.
• WARNING: It captures information describing a minor problem or warning. Logging level WARNING can also be applied with a value 30.
• ERROR: It captures information describing a major problem in a code structure. Logging level ERROR can also be applied with a value 40.
• CRITICAL: It captures information describing a critical or fatal problem. Logging level CRITICAL can also be applied with a value 50.
• Handlers: It determines what happens to each message in a logger.
• Filters: A filter can provide additional control over which log records need to be passed from logger to handler.
• Formatters: A log record is finally rendered as text. Formatters do the formatting of python objects into text.

To implement logging, simply write the code below in settings.py

LOGGING = {
        'version': 1,
        'disable_existing_loggers':False,
        'handlers':{
            'console':{
                'class':'logging.StreamHandler',
            },
            'file':{
                'class':'logging.FileHandler',
                'filename':'programink.log',
            },
        },
        'root':{
            'handlers':['console', 'file'],
            'level':'DEBUG',
        },
    }
                                

Django Exceptions

Exceptions is Django are as below:

• AppRegistryNotReady
• ObjectDoesNotExist
• EmptyResultSet
• FieldDoesNotExist
• MultipleObjectsReturned
• SuspiciousOperation
• PermissionDenied
• ViewDoesNotExist
• MiddlewareNotUsed
• ImproperlyConfigured
• FieldError
• ValidationError
• UnreadablePostError
• TransactionManagementError
• DatabaseError
• IntegrityError
• DataError
• Resolver404
• NoReverseMatch