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Ensures a DocumentVersion object has share_id and share_url attributes, initializing them to None if missing and persisting changes to the database.

Purpose

This function performs defensive attribute checking and initialization for DocumentVersion objects to ensure they have the required share_id and share_url attributes. It's used to handle schema evolution or missing attributes on legacy objects, preventing AttributeError exceptions when accessing these fields. The function attempts to save changes to the database if attributes were added.

Source Code

def ensure_document_version_share_attributes(version: DocumentVersion) -> bool:
    """
    Ensure that a document version has the share_id and share_url attributes.
    
    Args:
        version: The document version to check/update
        
    Returns:
        bool: True if attributes were initialized or already exist, False otherwise
    """
    try:
        updated = False
        
        # Check for share_id attribute
        if not hasattr(version, 'share_id'):
            logger.info(f"Adding missing share_id attribute to document version {version.uid}")
            setattr(version, 'share_id', None)
            updated = True
            
        # Check for share_url attribute
        if not hasattr(version, 'share_url'):
            logger.info(f"Adding missing share_url attribute to document version {version.uid}")
            setattr(version, 'share_url', None)
            updated = True
            
        # Save the changes if needed
        if updated:
            try:
                version.save()
                logger.info(f"Successfully saved share attributes for document version {version.uid}")
            except Exception as save_err:
                logger.error(f"Error saving share attributes for document version {version.uid}: {str(save_err)}")
                return False
                
        return True
    except Exception as e:
        logger.error(f"Error ensuring share attributes for document version {version.uid}: {str(e)}")
        return False

Parameters

Parameter Details

version: A DocumentVersion model instance to check and potentially update. Must be a valid DocumentVersion object with a 'uid' attribute and a 'save()' method for persisting changes to the database.

Return Value

Type: bool

Returns a boolean value: True if the share attributes already existed or were successfully initialized and saved (or no save was needed), False if an error occurred during the save operation or attribute checking process.

Dependencies

• logging
• CDocs.models.document.DocumentVersion

Required Imports

import logging
from CDocs.models.document import DocumentVersion

Usage Example

from CDocs.models.document import DocumentVersion
import logging

logger = logging.getLogger(__name__)

# Retrieve a document version instance
doc_version = DocumentVersion.objects.get(uid='some-uid')

# Ensure share attributes exist
success = ensure_document_version_share_attributes(doc_version)

if success:
    print(f"Share attributes ensured for version {doc_version.uid}")
    # Now safe to access share_id and share_url
    print(f"Share ID: {doc_version.share_id}")
    print(f"Share URL: {doc_version.share_url}")
else:
    print("Failed to ensure share attributes")

Best Practices

• Ensure a logger instance is configured before calling this function to capture diagnostic information
• This function modifies the database if attributes are missing, so use within appropriate transaction boundaries
• The function returns False on save errors but True if attributes already exist, so check return value carefully
• Consider calling this function during application startup or migration scripts to ensure all DocumentVersion instances have required attributes
• The function uses hasattr() which may not detect properties or descriptors; ensure share_id and share_url are simple attributes
• Handle the False return value appropriately as it indicates a database save failure that may require retry logic

Tags

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