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A custom exception class that serves as the base exception for all controller-related errors in the CDocs system.

Purpose

ControllerError is a base exception class designed to provide a specific exception hierarchy for controller-related errors in the CDocs application. It inherits from Python's built-in Exception class and serves as a parent class for more specific controller exceptions. This allows for granular error handling and makes it easier to catch and handle controller-specific errors separately from other exceptions in the application. By creating a custom exception hierarchy, developers can implement targeted exception handling strategies for different types of controller failures.

Source Code

class ControllerError(Exception):
    """Base exception for controller errors."""
    pass

Parameters

Parameter Details

*args: Variable length argument list passed to the parent Exception class. Typically includes the error message as the first argument.

**kwargs: Arbitrary keyword arguments passed to the parent Exception class for additional exception metadata.

Return Value

Instantiation returns a ControllerError exception object that can be raised and caught. When raised, it behaves like any standard Python exception, carrying the message and traceback information provided during instantiation.

Class Interface

Methods

Attributes

Required Imports

No imports required - ControllerError can be defined standalone as it only inherits from built-in Exception

Usage Example

# Define the exception class
class ControllerError(Exception):
    """Base exception for controller errors."""
    pass

# Raising the exception
def some_controller_function():
    if error_condition:
        raise ControllerError("An error occurred in the controller")

# Catching the exception
try:
    some_controller_function()
except ControllerError as e:
    print(f"Controller error caught: {e}")

# Creating derived exceptions
class ValidationError(ControllerError):
    """Raised when validation fails."""
    pass

class AuthorizationError(ControllerError):
    """Raised when authorization fails."""
    pass

# Using derived exceptions
try:
    if not user.has_permission():
        raise AuthorizationError("User lacks required permissions")
except ControllerError as e:
    # This catches both ValidationError and AuthorizationError
    print(f"Controller error: {e}")

Best Practices

• Use ControllerError as a base class for more specific controller exceptions rather than raising it directly
• Create derived exception classes for different types of controller errors (e.g., ValidationError, AuthorizationError, NotFoundError)
• Always provide descriptive error messages when raising the exception to aid in debugging
• Catch ControllerError in application-level error handlers to handle all controller-related errors uniformly
• Document the specific conditions under which this exception or its subclasses are raised
• Consider adding custom attributes to derived classes to provide additional context (e.g., error codes, affected resources)
• Use this exception hierarchy to separate controller errors from model errors, view errors, or other application errors
• When catching exceptions, catch specific derived exceptions before catching the base ControllerError to handle different error types appropriately

Tags

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