I wrote this gem, GitHub - NullVoxPopuli/skinny_controllers: A pattern for allowing for easier testing of large projects' business logic
which is influenced by Trailblazer, but less with some different opinions here and there.
The main idea that it pulls out of trailblazer is operations and policies.
Operations are in
Policies are in
Operations control what data you are getting, and Policies control if you are allowed to get it.
The goal is to have all the logic in ruby objects that don’t require a controller instance to run (i.e. avoiding put/get/post in your tests).
At the very minimum, you’d need
include SkinnyControllers::Diet # and then in your action render json: model
and the rest is implicit.
obviously, not everyone wants the same create / update / destroy functionality, so that can all be configured:
here is an example of the
create operation for the
module EventOperations class Create < SkinnyControllers::Operation::Base def run return unless allowed? # @model is used here, because the method `model` is memoized off @model @model = model_class.new(model_params) @model.save @model # or just `model` end end end
allowed? is a special method that looks up the corresponding policy:
class EventPolicy < SkinnyControllers::Policy::Base # for the Create operation for the EventsController is matched to create? in the policy # o / object here is the instance of the model trying to be created def create?(o = object) user.is_admin? end end
I’m using this in a big side project I’ve been working on for event registration. (Rails API + Ember)
example of operation specs:
example of policy specs: