Presenters and Model-View-Presenter (MVP) is the second most useful pattern after Service Objects to simplify your medium-to-large app. ActiveModelPresenter is a small gem that transforms ActiveRecord models into simple decorated objects that you can use to pass data for a JSON or a regular View rendering. It's based on Rails' **active_model_serializers** gem (AMS) so you get all it's features without creating any new type of files. It can be used as a layer for Rails between Controller and View to make data to flow in 1 direction.