tap/app/controllers/users_controller.rb

class UsersController < ApplicationController
  before_action :logged_in_user, only: [ :index, :edit, :update, :show]
  before_action :correct_user,   only: [:edit, :update]

  def index
    @users = User.paginate(page: params[:page])
  end


  def new
  	@user = User.new
  end

  def show
  	@user = User.find(params[:id])
    @orders = @user.orders.paginate(page: params[:page])
  end

  def create
  	@user = User.new(user_params)
  	if @user.save
      log_in @user
      flash[:success] = "Welcome to the Sample App!"
  		redirect_to @user
  	else
  		render 'new'
  	end
  end

  def order
    @user = User.find(params[:id])
  end

  def edit
    @user = User.find(params[:id])
  end

  def update
    @user = User.find(params[:id])
    if @user.update_attributes(user_params)
      redirect_to @user
    else
      render 'edit'
    end
  end

  private

    def user_params
      params.require(:user).permit(:name, :marks)
    end

    # Confirms a logged-in user.
    def logged_in_user
      unless logged_in?
        store_location
        flash[:danger] = "Please log in."
        redirect_to login_url
      end
    end

    # Confirms the correct user.
    def correct_user
      @user = User.find(params[:id])
      redirect_to(root_url) unless current_user?(@user)
    end

end