Divergent Change

A class suffers from Divergent Change when it changes for multiple reasons.

Symptoms

• You can’t easily describe what the class does in one sentence.
• The class is changed more frequently than other classes in the application.
• Different changes to the class aren’t related to each other.

Solutions

• Extract Class⭐ to move one cause of change to a new class.
• Move Method⭐ if the class is changing because of methods that relate to another class.
• Extract Validator to move validation logic out of models.
• Introduce Form Object to move form logic out of controllers.
• Use Convention Over Configuration to eliminate changes that can be inferred by a convention such as a name.