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class ValidationError_v1

Maturity: 38

Custom exception class that signals input validation failures in the controller layer of the CDocs application.

File:
/tf/active/vicechatdev/CDocs/controllers/__init__.py
Lines:
72 - 74
Complexity:
simple

Purpose

ValidationError is a specialized exception class that inherits from ControllerError. It is designed to be raised when input validation fails in controller operations, providing a clear and specific exception type for validation-related errors. This allows calling code to distinguish validation failures from other types of controller errors and handle them appropriately. It serves as a semantic marker in the exception hierarchy to improve error handling and debugging.

Source Code

class ValidationError(ControllerError):
    """Exception raised when input validation fails."""
    pass

Parameters

Name Type Default Kind
bases ControllerError -

Parameter Details

*args: Variable positional arguments passed to the parent Exception class, typically the error message string describing what validation failed

**kwargs: Variable keyword arguments passed to the parent Exception class for additional exception context

Return Value

Instantiation returns a ValidationError exception object that can be raised. When caught, it provides access to the error message and traceback information inherited from the base Exception class through ControllerError.

Class Interface

Methods

__init__(*args, **kwargs)

Purpose: Initialize the ValidationError exception with an error message and optional additional context

Parameters:

  • *args: Positional arguments, typically a string message describing the validation failure
  • **kwargs: Keyword arguments for additional exception context

Returns: None (constructor)

Attributes

Name Type Description Scope
args tuple Tuple of arguments passed to the exception, typically containing the error message as the first element. Inherited from base Exception class. instance

Dependencies

  • CDocs.config
  • CDocs.models.user_extensions

Required Imports

from CDocs.controllers.errors import ValidationError

Usage Example

from CDocs.controllers.errors import ValidationError

def validate_document_title(title: str) -> None:
    """Validate document title meets requirements."""
    if not title:
        raise ValidationError("Document title cannot be empty")
    if len(title) > 255:
        raise ValidationError("Document title exceeds maximum length of 255 characters")
    if not title.strip():
        raise ValidationError("Document title cannot contain only whitespace")

# Usage in controller
try:
    validate_document_title("")
except ValidationError as e:
    print(f"Validation failed: {e}")
    # Handle validation error appropriately

# Catching in exception hierarchy
try:
    validate_document_title("x" * 300)
except ControllerError as e:
    # Catches ValidationError and other ControllerError subclasses
    print(f"Controller error occurred: {e}")

Best Practices

  • Always provide a descriptive error message when raising ValidationError to help identify what validation failed
  • Use ValidationError specifically for input validation failures, not for other types of errors
  • Catch ValidationError when you need to handle validation errors differently from other controller errors
  • Consider catching the parent ControllerError if you want to handle all controller-related errors uniformly
  • Include specific details about the validation failure in the error message (e.g., which field failed, what constraint was violated)
  • Raise ValidationError early in controller methods after validating inputs to fail fast
  • Document which validations can raise ValidationError in your controller method docstrings
  • Use ValidationError in conjunction with validation logic to separate validation concerns from business logic

Tags

exception validation error-handling controller input-validation custom-exception CDocs

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