Keep Controllers Thin: Use Command Objects

6655 views

                  module Snips
  class Create
    def initialize(author:, params:)
      @author = author
      @params = params
    end

    def call
      Snip.create!(@params.merge(author: @author, active_at: Time.current))
    end
  end
end

                  class SnipsController < ApplicationController
  def create
    snip = Snips::Create.new(author: current_member, params: snip_params).call
    redirect_to snip
  end

  private

  def snip_params
    params.require(:snip).permit(:title, :content)
  end
end

Command objects (a.k.a. “actions”) make controllers boring. They’re easy to test, easy to instrument, and they produce a stable API for the rest of your app. This is the kind of structure that makes large Rails apps maintainable.

Sarah Chen

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Keep Controllers Thin: Use Command Objects

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