active-record-model-best-practices

To refactor a Rails model exceeding 100 lines, extract mixed responsibilities into concerns, service objects, query objects, form objects, and value objects. This ensures models contain only associations, enums, basic validations, and concern includes.

Use service objects and query objects in Ruby on Rails when a model handles multiple responsibilities and requires refactoring for organization. This breaks down monolithic models into reusable components, improving code readability and maintainability.

The best way to organize complex ActiveRecord models for maintainability is applying design patterns like concerns, form objects, and value objects. This structured approach reduces cognitive load by ensuring models only contain associations, enums, and basic validations.

After refactoring a Rails model by extracting design patterns, the model should contain only associations, enums, basic validations, and concern includes. Complex query logic and mixed responsibilities are moved to dedicated service and query objects.

Refactoring Rails models into concerns and form objects improves code readability and maintainability by breaking down monolithic structures. This reduces developer cognitive load by isolating mixed responsibilities into organized, reusable design pattern components.