erb-to-view-model

Migrate ERB templates by precomputing values in a dedicated Ruby ViewModel to remove direct model access from views. This replaces instance variables and helpers with explicit view_model attributes, improving testability and separation of concerns.

A precomputed ViewModel is a Ruby object under app/view_models/ that calculates values upfront via self.init(params). It replaces direct model access and helpers in views with explicit attributes, ensuring views read only from prepared data.

Migrate ERB templates bottom-up by starting from the deepest partials and moving upward through the render tree. Update controllers to pass a single view_model as a local, delegating all logic to the precomputed ViewModel attributes.

Yes, the migration process replaces current_user logic and instance variables by precomputing those values into ViewModel attributes. The controller passes the precomputed view_model to the view, removing direct access to current_user from the template.

Yes, migrating to precomputed ViewModels requires thin controllers that pass a single view_model to views. The controller delegates business logic to the ViewModel, satisfying constraints for explicit initialization parameters and separation of concerns.

Replace Rails view helpers by precomputing their output into ViewModel attributes during migration. This moves the helper logic out of the ERB template and into the Ruby ViewModel, ensuring the view only reads from explicit data.