How pretty the Rails 3 controllers can be.

goals_controller.rb

class GoalsController < ApplicationController
  respond_to :html, :json
  before_action :set_goal, only: [:show, :edit, :update]

  def show
    respond_with @goal
  end
  
  def edit
    respond_with @goal
  end

  def update
    if @goal.update(goal_params)
      flash[:notice] = 'Goal was successfully updated.'
    end
    respond_with @goal
  end

  private
    def set_goal
      @goal = Goal.find(params[:id])
    end

    def goal_params
      params.require(:goal).permit(:name, :description, :goal_type)
    end
end