Interface proposal for ServiceObject/Interactor/UseCase on rails

sign_in.rb

class SessionsController < ApplicationController
  def create
    ToDoList::SignIn.new(sign_in_params).call({
      success: ->(message) { redirect_to dashboard_user_path, notice: t(message) },
      failure: ->(message) { render :new, error: t(message) }
    })
  end
end

module ToDoList
  class SignIn
    def initialize(params)
      @username, @password = params[:username], params[:password]
    end
    
    def call(callbacks)
      if user && user.authentic?(password)
        callbacks.fetch(:success).call("sign_in.success")
      else
        callbacks.fetch(:failure).call("sign_in.failure")
      end
    end
  end
end