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This chapter is from the book

This chapter is from the book

Refactoring: Ruby EditionRefactoring: Ruby Edition

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This chapter is from the book

This chapter is from the book

Refactoring: Ruby EditionRefactoring: Ruby Edition

Learn More Buy

Data Class

These are classes that have attributes, and nothing else. Such classes are dumb data holders and are almost certainly being manipulated in far too much detail by other classes. Use Remove Setting Method on any instance variable that should not be changed. If you have collection instance variables, check to see whether they are properly encapsulated and apply Encapsulate Collection if they aren't.

Look for where these getting and setting methods are used by other classes. Try to use Move Method to move behavior into the data class. If you can't move a whole method, use Extract Method to create a method that can be moved. After a while you can start using Hide Method on the getters and setters.

Data classes are like children. They are okay as a starting point, but to participate as a grownup object, they need to take some responsibility.

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Last Update: November 17, 2020