How to Fix Adapter Errors

In this tutorial, you'll learn about How to Fix Adapter Errors. We cover key concepts, practical examples, and best practices.

Fix adapter errors when incompatible interfaces manually translated everywhere instead of adapter class.

Quick Fix

Wrong

class OldLogger:
    def log_msg(self,m): print(f'OLD: {m}')
class NewLogger:
    def log(self,m,lvl): print(f'[{lvl}] {m}')
# Client code manually adapts each time:
nl=NewLogger(); nl.log('hi','INFO')

Every call site manually converts interface. Duplicated adaptation logic.

Right

class OldLogger:
    def log_msg(self,m): print(f'OLD: {m}')
class NewLogger:
    def log(self,m,lvl): print(f'[{lvl}] {m}')
class LoggerAdapter:
    def __init__(self,logger): self.logger=logger
    def log_msg(self,m): self.logger.log(m,'INFO')
ol=OldLogger(); ol.log_msg('hi')
nl=LoggerAdapter(NewLogger()); nl.log_msg('hi')

Both old and new loggers work through same log_msg() interface. Adapter wraps NewLogger.

Prevention

Wrap incompatible interface with adapter class that exposes expected interface.

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