resourcify.rb

module Resourcify
  extend ActiveSupport::Concern

  included do
    before_action :set_resource, only: [:show, :update, :destroy]
  end

  def index
    @resources = resource_class.all
  end

  def create
    @resource = resource_class.new(create_params)
    @resource.save!

    render :show, status: :created
  end

  def show
  end

  def update
    @resource.update!(update_params)

    render :show, status: :ok
  end

  def destroy
    @resource.destroy

    head :no_content
  end

  private

  def resource_class
    controller_name.classify.constantize
  end

  def set_resource
    @resource = resource_class.find(params[:id])
  end

  def resource_params
    raise NotImplementedError
  end

  def create_params
    resource_params
  end

  def update_params
    resource_params
  end
end

Make sure to put include Resourcify after other controller callbacks